How to compile Windows exe files from this source
I don't know much more about D than creating a 'hello world' exe file with the DMD Compiler but I'm interested in using the eBay/tsv-utils binaries. Unfortunately, the author didn't create any MS Windows binaries: https://github.com/eBay/tsv-utils/releases Does anyone know how to compile this code into MS Windows binaries?
Can I count the of enum's fields at compile time?
for example:
enum A { a = -10, b = -11, c = -12, d = -13, e = -34}
enum int countOfA = coutOfFields(A); // 5 fields
Re: Can I count the of enum's fields at compile time?
On Thursday, 23 November 2017 at 01:01:42 UTC, Michael V.
Franklin wrote:
On Thursday, 23 November 2017 at 00:58:21 UTC, Marc wrote:
for example:
enum A { a = -10, b = -11, c = -12, d = -13, e = -34}
enum int countOfA = coutOfFields(A); // 5 fields
https://dlang.org/spec/traits.html#allMembers
enum A { a = -10, b = -11, c = -12, d = -13, e = -34}
enum int countOfA = __traits(allMembers, A).length; // 5 fields
static assert(countOfA == 5);
Mike
This was fast! Thanks
Re: Can I count the of enum's fields at compile time?
On Thursday, 23 November 2017 at 01:04:29 UTC, Jonathan M Davis
wrote:
On Thursday, November 23, 2017 00:58:21 Marc via
Digitalmars-d-learn wrote:
for example:
enum A { a = -10, b = -11, c = -12, d = -13, e = -34}
enum int countOfA = coutOfFields(A); // 5 fields
import std.traits;
enum countOfA = EnumMembers!A.length;
- Jonathna M Davis
This sounds more readable. I was going to write a "function
extension" to enum but I think it isn't really needed. Thank you
too.
Re: Can I count the of enum's fields at compile time?
On Thursday, 23 November 2017 at 01:34:54 UTC, Ali Çehreli wrote:
On 11/22/2017 05:21 PM, Marc wrote:
On Thursday, 23 November 2017 at 01:04:29 UTC, Jonathan M
Davis wrote:
On Thursday, November 23, 2017 00:58:21 Marc via
Digitalmars-d-learn wrote:
[...]
import std.traits;
enum countOfA = EnumMembers!A.length;
- Jonathna M Davis
This sounds more readable. I was going to write a "function
extension" to enum but I think it isn't really needed. Thank
you too.
As an eponymous template:
enum One { a }
enum Three { a, b, c }
import std.range : EnumMembers;
enum countOf(E) = EnumMembers!E.length;
unittest {
static assert(countOf!One == 1);
static assert(countOf!Three == 3);
}
void main() {
}
Ali
whoa, this is so easy and elegant. I'm falling in love with D.
Thank you too!
lower case only first letter of word
Does D have a native function to capitalize only the first letter of the word? (I'm asking that so I might avoid reinvent the wheel, which I did sometimes in D)
Re: lower case only first letter of word
On Tuesday, 5 December 2017 at 13:40:08 UTC, Daniel Kozak wrote: but this will change all other uppercase to lowercase, so maybe it is not what you want. If you really want just change first char to upper, then there is nothing wrong to do it yourself On Tue, Dec 5, 2017 at 2:37 PM, Daniel Kozak wrote: Something like this: https://dlang.org/phobos/std_uni.html#asCapitalized On Tue, Dec 5, 2017 at 2:31 PM, Marc via Digitalmars-d-learn < digitalmars-d-learn@puremagic.com> wrote: Does D have a native function to capitalize only the first letter of the word? (I'm asking that so I might avoid reinvent the wheel, which I did sometimes in D) Yes, this is not what I want. I want to convert only the first letter of the word to lower case and left all the others immutable. similar to PHP's lcfirst(): http://php.net/manual/en/function.lcfirst.php
how do I read a class member's value using traits?
I need to give a class C, read all user-defined members of it,
both name and value dynamically. for example:
class C {
string a;
string b;
string c;
}
then
Class c = new C();
// set c members...
enum string[] members = [__traits(allMembers, C)];
foreach(string member; members) {
string value = __traits(getMember, c, member);
doSomething(member, value);
}
I get this error:
Error: variable member cannot be read at compile time
Error: string expected as second argument of __traits
`getMember` instead of `__error`
why can't member in foreach(string member; members) be read at
compile time? I've also tried
foreach(enum string member; members)
and
static foreach(string member; members)
but it result a lot of error messages.
get only user-defined members
how do I from class:
class Person {
string name;
int age;
}
do:
auto c = [__traits(allMembers, Person)];
then return only ["name", "age"] rather ["name, "age", "ctor",
"toString" ... ]?
Re: get only user-defined members
On Saturday, 16 December 2017 at 07:23:38 UTC, Jonathan M Davis
wrote:
On Saturday, December 16, 2017 04:01:10 Marc via
Digitalmars-d-learn wrote:
how do I from class:
> class Person {
>
> string name;
> int age;
>
> }
do:
> auto c = [__traits(allMembers, Person)];
then return only ["name", "age"] rather ["name, "age", "ctor",
"toString" ... ]?
Try __traits(derivedMembers, Person).
https://dlang.org/spec/traits.html#derivedMembers
Depending on what you want though, it's not all that uncommon
to use a variety of traits to filter the list down to whatever
it is that you actually want. std.traits and std.meta are your
friends in addition to __traits.
- Jonathan M Davis
It derivedMembers worked but I didn't understand how so. It
returned the proper array ["name", "age", "this"] but how are
them derived? or it's D's design that every class is implicitily
derived from a "main objet"?
Thanks for your suggeston on std.traits and std.meta, I didn't
know about the last one.
Re: how do I read a class member's value using traits?
On Saturday, 16 December 2017 at 03:48:01 UTC, Jonathan M Davis
wrote:
On Saturday, December 16, 2017 03:34:43 Marc via
Digitalmars-d-learn wrote:
I need to give a class C, read all user-defined members of it,
both name and value dynamically. for example:
> [...]
then
>[...]
I get this error:
> [...]
why can't member in foreach(string member; members) be read at
compile time? I've also tried
You're trying to read a runtime value at compile time, and
that's not going to work. c doesn't exist until runtime, so
none of its members exist until runtime. You can introspect on
the type C, but the variable c is a runtime entity.
- Jonathan M Davis
You're right. I changed to generate code to do it properly at
runtime, something like this:
enum string[] members = [__traits(derivedMembers, Field)] [0 ..
$ - 1];
static foreach(enum string member; members) {
doSomething(member, __traits(getMember, fields,
member));
}
Not sure if best approach. note: I know [0 .. $ -1] is probably
wrong. I'll fix it
Does D have class' attributes like C#'s?
C# has a quite nice way to store metadata about a property by a
feature called atributes[1]. For example, I can write something
like this:
class A {
[TextSize(256)]
string Name { get; set; }
}
So using runtime/reflection I can retrieve the TextSize value
associated to A.name property.
Does D have something similar?
Re: Does D have class' attributes like C#'s?
On Saturday, 16 December 2017 at 20:05:15 UTC, Anonymouse wrote:
On Saturday, 16 December 2017 at 19:57:30 UTC, Marc wrote:
C# has a quite nice way to store metadata about a property by
a feature called atributes[1]. For example, I can write
something like this:
class A {
[TextSize(256)]
string Name { get; set; }
}
So using runtime/reflection I can retrieve the TextSize value
associated to A.name property.
Does D have something similar?
UDAs? User Defined Attributes.
https://dlang.org/spec/attribute.html#UserDefinedAttribute
http://ddili.org/ders/d.en/uda.html
class A {
@TextSize(256)
string name() { /* ... */ }
}
I can't "pack" an object, right? In C#, TextSize is a class and
256 is constructor's first argument. In D it's pretty much an
array but I guess it's close enough. Thanks!
How do I pass a type as parameter in this method?
Imaginary code:
int index = FirstOrDefault!(int)(__traits(getAttributes, C.a));
In that case, if the tuple is empty, the value is the int's type
default value.
The method is defined as following:
template FirstOrDefault(X)(T...) {
static if(T.length > 0) {
enum FirstOrDefault = T[0];
} else {
enum FirstOrDefault = X.init;
}
}
Re: How do I pass a type as parameter in this method?
On Tuesday, 19 December 2017 at 00:01:00 UTC, Ali Çehreli wrote:
On 12/18/2017 03:54 PM, Ali Çehreli wrote:
On 12/18/2017 02:58 PM, Marc wrote:
Here's another experiment:
template FirstOf(T...) {
template otherwise(D) {
static if (T.length == 0) {
enum otherwise = D.init;
} else {
enum otherwise = T[0];
}
}
}
void main() {
static assert (FirstOf!(1.5, "hello").otherwise!int == 1.5);
static assert (FirstOf!("world", [1]).otherwise!int ==
"world");
static assert (FirstOf!().otherwise!int == 0);
}
Ali
Thanks four answer. I'll be using this one. I was messing around
and getting multiple arguments to template function too. I like
the naming too, it made code clear, imo.
It's possible to have overload where one take a type name and the
other a variable (constant value actually)? something like this
(also imaginary code):
template FirstOf(TP...) {
template otherwise(D) {
static if(TP.length > 0) {
enum otherwise = TP[0];
} else {
enum otherwise = D.init;
}
}
template otherwise(D value) {
static if(TP.length > 0) {
enum otherwise = TP[0];
} else {
enum otherwise = value;
}
}
}
So I can use like this:
int index = FirstOf!(myTuple).otherwise!int;
int value = FirstOf(myTuple2).otherwise!(10);
with my limited template knowledge, I know I can write it like
this:
template otherwise(D, D value) {
static if(TP.length > 0) {
enum otherwise = TP[0];
} else {
enum otherwise = value;
}
}
So the call would go like this:
int value = FirstOf(myTuple2).otherwise!(int, 10);
But for simplicity I'd like to infer the type from constant value
passed in parameter, in that case, the integer value of 10.
Re: How do I pass a type as parameter in this method?
On Tuesday, 19 December 2017 at 15:52:57 UTC, Dgame wrote:
On Tuesday, 19 December 2017 at 15:19:53 UTC, Marc wrote:
[...]
template FirstOf(T...) {
template otherwise(D) {
static if (T.length == 0) {
enum otherwise = D.init;
} else {
enum otherwise = T[0];
}
}
template otherwise(alias value) {
static if (T.length == 0) {
enum otherwise = value;
} else {
enum otherwise = T[0];
}
}
}
void main() {
static assert (FirstOf!(1.5, "hello").otherwise!int == 1.5);
static assert (FirstOf!("world", [1]).otherwise!int ==
"world");
static assert (FirstOf!().otherwise!int == 0);
static assert (FirstOf!(1.5, "hello").otherwise!23 == 1.5);
static assert (FirstOf!().otherwise!42 == 42);
}
Didn't know about alias as template paramter. Exactly what I
wanted. Thank you!
Can I run this at compile time?
Give this function I'd like to run it at compile time:
import std.concurrency : Generator, yield;
Generator!string getNonIntegralMembers() {
return new Generator!string({
enum allMembers = __traits(derivedMembers, C);
foreach(enum string member; allMembers) {
bool isInteg = __traits(isIntegral, >__traits(getMember, C,
member));
if(!isInteg) {
yield(member);
}
}
});
}
but when I do:
enum string[] members = getNonIntegralMembers();
writeln(members);
I get the following erros:
C:\D\dmd2\windows\bin\..\..\src\druntime\import\core\thread.d(4059): Error:
static variable PAGESIZE cannot be read at compile time
C:\D\dmd2\windows\bin\..\..\src\phobos\std\concurrency.d(1548):
called from here: super.this(dg, PAGESIZE * 4u, PAGESIZE)
app.d(96):called from here: getNonIntegralMembers()
Re: Can I run this at compile time?
On Wednesday, 20 December 2017 at 17:16:50 UTC, Mengu wrote: On Wednesday, 20 December 2017 at 16:54:35 UTC, Marc wrote: Give this function I'd like to run it at compile time: import std.concurrency : Generator, yield; [...] but when I do: [...] I get the following erros: C:\D\dmd2\windows\bin\..\..\src\druntime\import\core\thread.d(4059): Error: static variable PAGESIZE cannot be read at compile time C:\D\dmd2\windows\bin\..\..\src\phobos\std\concurrency.d(1548): called from here: super.this(dg, PAGESIZE * 4u, PAGESIZE) app.d(96):called from here: getNonIntegralMembers() if PAGESIZE is not dynamic, it will not work at compile time. make it an enum or const and give it a try. the problem is, PAGESIZE part of D's library so I can't change it. I'm looking for a way to make Generators work at runtime actually. Or a replacement for it.
It's possible to declare a variable inside a static foreach()?
For example, I'd like to declare a variable inside a static
foreach like in below code, just for better organization,
otherwise, I have to use the value directly instead of the
variable. If the value is used more than once, it might be
inviable.
enum allMembers = __traits(derivedMembers, C);
static foreach(enum string member; allMembers) {
enum attributes = __traits(getAttributes, __traits(getMember,
C, member));
static foreach(C c; attributes) {
writeln(c);
}
}
I got redefinition erros of "atributes" on this. Can I have this
only at compile time?
alias to struct method
How can I create a alias to a struct method?
struct S {
string doSomething(int n) { return ""; }
}
I'd like to do something like this (imaginary code):
alias doSomething = S.doSomething;
then call it by doSomething(3)
I got the following error from this code:
Error: need 'this' for 'gen' of type 'string(int n)'
So I tried create a instance:
alias doSomething = S().doSomething;
Changes the error to:
app.d(96): Error: function declaration without return type.
(Note that > constructors are always named this)
app.d(96): Error: semicolon expected to close alias declaration
What does scope do as storage class?
for example:
scope struct S {
int x;
}
What does scope do here?
Does to!(string)(char[]) do any memory allocation on conversion?
Does to!(string)(char[]) do any memory allocation on conversion or is this similar to a cast or what else?
Can I use memoize with a non-static struct method?
something like this:
struct S {
// variables...
string doGen(int n) { return ""; }
alias gen = memoize!doGen;
}
The error I got is:
Error: need 'this' for 'doGen' of type 'string(int n)'
I can't make doGen static because it access non-static struct
members... can I workaround this?
Re: copy only reference rather duplicate a string in appender!string
of course a totally different approach to solve this is welcome, I came from C/C++/C# worlds so I'm in the process of slowly converting my thinking to the D way (which is new for me, since I'm even unifamiliar with python and such, which got such friendly syntax)
copy only reference rather duplicate a string in appender!string
I do build a string by coping large parts of diffrent buffers,
all those buffers live after the functional call, so rather than
duplicate those string I'd like to copy only references to those
parts rather duplicate every string. I combined appender!string,
assumeUnique() and array slices. Something like this:
auto buffer = appender!string;
auto list = cycle(buffers);
while(bufferIsFilled) {
char[] buffer = get_buffer(); // pop a buffer from circular
buffer
int s = get_buffer_size(x); // determine which part of that
buffer we need
buffer.put(assumeUnique(buf[0 .. s])); // and here's my
question
}
return buffer.data;
How do I set a class member value by its name in a string?
I'd like to set the members of a class by its name at runtime, I would do something like this: __traits(getMember, myClass, name) = value; but since name is only know at runtime, I can't use __traits(). What's a workaround for this?
Re: How do I set a class member value by its name in a string?
Always helpful. Thank you very much guys.
take symbol as parameter
how do I take a symbol as parameter?
for example:
template nameof(alias S) {
import std.array : split;
enum nameof = S.stringof.split(".")[$-1];
}
Works fine for say a enum member such nameof!(myEnum.X) but this:
struct S { int v; }
S s;
writefln(nameof!(s.v)); // should return "v"
return the following error:
Error: template instance nameof!(v) cannot use local 'v' as
parameter to > non-global template nameof(alias S)
Re: take symbol as parameter
On Saturday, 30 December 2017 at 23:30:02 UTC, rjframe wrote:
On Sat, 30 Dec 2017 13:07:49 +, Marc wrote:
how do I take a symbol as parameter?
for example:
template nameof(alias S) {
import std.array : split;
enum nameof = S.stringof.split(".")[$-1];
}
Works fine for say a enum member such nameof!(myEnum.X) but
this:
struct S { int v; }
S s;
writefln(nameof!(s.v)); // should return "v"
return the following error:
Error: template instance nameof!(v) cannot use local 'v' as
parameter
to > non-global template nameof(alias S)
You can use the name of the struct rather than the instance.
writefln(nameof!(S.v));
it doesn't work for me:
Error: template instance nameof!(v) cannot use local 'v' as
parameter to non-global template nameof(alias S)
Re: take symbol as parameter
On Sunday, 31 December 2017 at 22:50:12 UTC, Marc wrote: On Saturday, 30 December 2017 at 23:30:02 UTC, rjframe wrote: On Sat, 30 Dec 2017 13:07:49 +, Marc wrote: how do I take a symbol as parameter? for example: [...] Works fine for say a enum member such nameof!(myEnum.X) but this: [...] return the following error: [...] You can use the name of the struct rather than the instance. writefln(nameof!(S.v)); it doesn't work for me: Error: template instance nameof!(v) cannot use local 'v' as parameter to non-global template nameof(alias S) Put it at global scope. Worked fine.
Re: take symbol as parameter
On Saturday, 30 December 2017 at 23:30:02 UTC, rjframe wrote:
On Sat, 30 Dec 2017 13:07:49 +, Marc wrote:
how do I take a symbol as parameter?
for example:
template nameof(alias S) {
import std.array : split;
enum nameof = S.stringof.split(".")[$-1];
}
Works fine for say a enum member such nameof!(myEnum.X) but
this:
struct S { int v; }
S s;
writefln(nameof!(s.v)); // should return "v"
return the following error:
Error: template instance nameof!(v) cannot use local 'v' as
parameter
to > non-global template nameof(alias S)
You can use the name of the struct rather than the instance.
writefln(nameof!(S.v));
How do I make it work when the symbol is defiend as following:
class C { int a() { return 0; }}
call to nameof!(C.a)
give compiler error:
Error: need 'this' for 'a' of type 'int()'
template instance foo.nameof!(a) error instantiating
Does UDA not work for enums?
I got compilers errors from this:
enum E {
@("foo")
A,
@("baa")
B
}
I got:
Error: basic type expected, not @
Error: no identifier for declarator _error_
Error: type only allowed if anonymous enum and no enum type
Error: if type, there must be an initializer
Error: found @ when expecting ,
[...]
How do I use ncurses library with D? are there any wrapper?
Long time ago, IIRC, I read somewhere there was a ncurses for D but now I can't find it are there any wrapper or am I mistaken? anyway, I'm doing it from scratch and not porting anything so even a library with same functionality as ncurses for D is welcome.
How do you do "const nazi" in D?
for a safe programming, since C/C++ times I try to make thing
const as possible. locals, parameters etc anything which isn't
going to change.
How do you do that in D? immutable everywhere?
for example:
foreach(Field field; fields) {
immutable string htmlOutputfile = genHTMLFilename();
do you use immutable here?
and on:
Field fromFile(in string filename) {
do you use in here if filename isn't going to change?
I'm trying to make my own const nazi guide for D, if anyone would
like to give your opinion on this, I would be glad.
what's the proper way to convert wchar[] to string?
when calling winapi functions, usually you to deal with the result in wchar[]. How do I convert it to string in D to be usable by the application? does D have a native for this?
Re: what's the proper way to convert wchar[] to string?
On Wednesday, 3 January 2018 at 18:59:39 UTC, Ali Çehreli wrote: On 01/03/2018 10:50 AM, Marc wrote: when calling winapi functions, usually you to deal with the result in wchar[]. How do I convert it to string in D to be usable by the application? does D have a native for this? std.conv has to and text: auto s0 = w.text; auto s1 = w.to!string; Ali whoa, that simple. I've tried to!string(w) before, but I realized the mistake I was passing the whole buffer rather: string s = w[0 .. wcslen(w.ptr)].to!string; Thanks.
how do I get only static member of a class?
I found no way with __traits() on std.traits. I found
isStaticFunction and isStaticArray but nothing about a member. Is
this by desgin?
Give a class like:
class C { static int a, b, c; int d; }
I'd like to get a, b and c.
I'm using this:
__traits(allMembers, C)
Re: Passing a type as paramter to super
On Thursday, 4 January 2018 at 19:16:03 UTC, Marc wrote:
For code generation purposes, I'd like to pass a type name to
base class. I'm not sure if it's supported, I didn't find
anything at documentation for class constructor but it does
compile:
class A {
static {
int a, b;
}
this(T)() {
}
}
then do something like this:
class B {
this() {
super!B;
}
}
but I got the error:
found ! when expecting ; following statement
sorry I mean define class b as following:
class B : A {
this() {
super!B;
}
}
Passing a type as paramter to super
For code generation purposes, I'd like to pass a type name to
base class. I'm not sure if it's supported, I didn't find
anything at documentation for class constructor but it does
compile:
class A {
static {
int a, b;
}
this(T)() {
}
}
then do something like this:
class B {
this() {
super!B;
}
}
but I got the error:
found ! when expecting ; following statement
Re: how do I get only static member of a class?
On Thursday, 4 January 2018 at 00:02:24 UTC, Ali Çehreli wrote:
On 01/03/2018 03:48 PM, Marc wrote:
I found no way with __traits() on std.traits. I found
isStaticFunction and isStaticArray but nothing about a member.
Is this by desgin?
Give a class like:
class C { static int a, b, c; int d; }
I'd like to get a, b and c.
I'm using this:
__traits(allMembers, C)
class C { static int a, b, c; int d; }
string[] staticMembers(T)() {
string[] statics;
foreach (m; __traits(derivedMembers, T)) {
import std.traits : hasStaticMember;
static if (hasStaticMember!(T, m)) {
statics ~= m;
}
}
return statics;
}
void main() {
pragma(msg, staticMembers!C);
}
Ali
Thanks again, Ali
what's the scope of a static variable inside a local function?
void foo() {
void baa() {
static int n;
writeln(n++);
}
}
void main() {
static int x;
foo();
doSomething(x);
}
does x and n has same lifetime, i.e, program's execution or n is
longer available onde foo() call reach out of scope?
Why is this valued zeroed?
I stuck at this and can't figure out the reason why the value of
the variable ds is 0 when I do this: startTime =
MonoTime.currTime; if I remove that statement, the value of ds
isn't zeroed, it has the actual number of seconds. But I can't
figure out, ds is of integer type and such, it is copied, right?
or is this related to the fact I'm setting it withi a callback
function?
here's the piece of code:
import std.net.curl;
auto http = HTTP(url);
http.method = HTTP.Method.get;
...
the relevant part:
http.onProgress = (size_t dltotal, size_t dlnow,
size_t ultotal, size_t ulnow) {
if(dlNow > 0) {
MonoTime endTime = MonoTime.currTime;
Duration duration = endTime - startTime;
long ds = duration.total!"seconds";
writeln("duration!seconds = ", ds);
startTime = MonoTime.currTime;
if I put startTime = MonoTime.currTime, ds is zero, otherwise, if
I remove it, ds has the actual value.
startTime is first set right before http.perform() call:
startTime = MonoTime.currTime;
http.perform();
(My goal is define the download transfer rate, different
approachs for this are welcome)
Re: Why is this valued zeroed?
On Friday, 12 January 2018 at 05:14:12 UTC, Jonathan M Davis wrote: On Thursday, January 11, 2018 14:07:18 Ali Çehreli via Digitalmars-d-learn wrote: [...] And if all what you're doing is printing the value out, you might as well just print the Duration directly rather than calling total. Duration.toString returns the units in a human-readable format such as "2 secs, 300 msecs, and 24 μs" or "29 msecs". https://dlang.org/phobos/core_time.html#.Duration.toString And if you're doing something like adding up the time spent, then you'd be better off keeping it in a Duration than converting it to long holding seconds or milliseconds or whatever. - Jonathan M Davis I do use that value as following: int t = fileSize / countOfByetsDownloaded * duration.total!"seconds"; I print that value there for testing only, if I was getting the values correctly. Thank you all guys for the answers.
continue in static foreach
How do I use?
static foreach(enum string member; members) {
static if(isFunction!(__traits(getMember, C, m ember)))
{
continue;
}
give error:
must use labeled continue within static foreach
then I tried:
outer:static foreach(enum string member; members) {
static if(isFunction!(__traits(getMember, C, >
member))) {
continue outer;
}
give error:
Error: enclosing label outer for continue not found
How do I fix it?
Re: continue in static foreach
On Friday, 12 January 2018 at 22:03:53 UTC, H. S. Teoh wrote:
On Fri, Jan 12, 2018 at 10:03:40PM +, Marc via
Digitalmars-d-learn wrote:
How do I use?
> static foreach(enum string member; members) {
>static if(isFunction!(__traits(getMember, C, member))) {
>continue;
>}
give error:
> must use labeled continue within static foreach
then I tried:
> outer:static foreach(enum string member; members) {
>static if(isFunction!(__traits(getMember, C, member))) {
>continue outer;
>}
give error:
> Error: enclosing label outer for continue not found
How do I fix it?
Unfortunately, this is currently not supported. You'll have to
use an else-clause to handle the case when the condition is
false.
T
thanks
How do I get class member type?
I didn't find how using traits I could get a class member type? I need to test if give class member is not immutable, I find isMutable but not how get a type from give class member to pass to it.
Re: How do I get class member type?
On Sunday, 14 January 2018 at 18:18:50 UTC, Marc wrote:
I didn't find how using traits I could get a class member type?
I need to test if give class member is not immutable, I find
isMutable but not how get a type from give class member to pass
to it.
for clarify, I want all this at compile time, imaginary code
example:
static foreach(field; FieldNameTuple!C) {
static if(isFunction!(__traits(getMember, C, field)) &&
isMutable(typeof(__traits(getMember, C, field {
// do something
}
}
Re: How do I get class member type?
On Sunday, 14 January 2018 at 19:08:44 UTC, Marc wrote:
On Sunday, 14 January 2018 at 18:18:50 UTC, Marc wrote:
I didn't find how using traits I could get a class member
type? I need to test if give class member is not immutable, I
find isMutable but not how get a type from give class member
to pass to it.
for clarify, I want all this at compile time, imaginary code
example:
static foreach(field; FieldNameTuple!C) {
static if(isFunction!(__traits(getMember, C, field)) &&
isMutable(typeof(__traits(getMember, C, field {
// do something
}
}
I solved with this:
enum isMutableString(string field) =
is(typeof(__traits(getMember, Field, field)) == string);
What's equivalent to C#'s select?
give a list, how can I select only the elements of a range according to a condition give by a lamba function? something like this: auto l = myList.select(e => e.id < 300); it would return a range. Similar to C#'s select: https://msdn.microsoft.com/en-us/library/bb548891(v=vs.110).aspx
Re: What's equivalent to C#'s select?
On Sunday, 14 January 2018 at 21:59:26 UTC, Seb wrote: On Sunday, 14 January 2018 at 21:21:52 UTC, Marc wrote: give a list, how can I select only the elements of a range according to a condition give by a lamba function? something like this: auto l = myList.select(e => e.id < 300); it would return a range. Similar to C#'s select: https://msdn.microsoft.com/en-us/library/bb548891(v=vs.110).aspx Shameless self-plug - you might like this (incomplete) comparison between LINQ and D ranges: https://github.com/wilzbach/linq Sounds pretty interesting, I'll give a try! Thanks
Re: What's equivalent to C#'s select?
On Sunday, 14 January 2018 at 21:38:39 UTC, drug wrote:
15.01.2018 00:21, Marc пишет:
give a list, how can I select only the elements of a range
according to a condition give by a lamba function?
something like this:
auto l = myList.select(e => e.id < 300);
it would return a range. Similar to C#'s select:
https://msdn.microsoft.com/en-us/library/bb548891(v=vs.110).aspx
import std.algorithm : filter;
auto l = myList.filter!(e => e.id < 300);
thanks, can i use it at compile time as well?
enum isMutableString(string field) =
is(typeof(__traits(getMember, >C, field)) == string);
static foreach(field; [FieldNameTuple!C].filter!(f =>
isMutableString!(f))) {
writeln(field);
}
give error:
Error: variable f cannot be read at compile time
How do I get the value cache()?
let's assume I have
class C {
static string foo() { writeln("got called!"); // }
}
then I want to cache foo at some point:
import std.algorithm;
auto v = cache(c.foo);
I call do:
for(int i = 0; i <10; i++) {
writeln(v);
}
then it'll print "got called" only once, which is what I want
but something obvious is how do I get the returned value as a
string?
here's why I'm confused more often than I should: I geeeting to
D's way to do thing and the auto keyword even in documentation
confused me a bit as I'm used to C++/C# world where the
struct/class returned is explicity so I just navigate to
aggregate type's documentation page.
Re: What's equivalent to C#'s select?
On Monday, 15 January 2018 at 07:37:42 UTC, Simen Kjærås wrote:
On Sunday, 14 January 2018 at 22:07:22 UTC, Marc wrote:
thanks, can i use it at compile time as well?
enum isMutableString(string field) =
is(typeof(__traits(getMember, >C, field)) == string);
static foreach(field; [FieldNameTuple!C].filter!(f =>
isMutableString!(f))) {
writeln(field);
}
You're mixing compile-time and run-time logic here in a way
that D doesn't allow. In particular, isMutableString requires
the passed string to be a compile-time constant, and filter
works on run-time values.
I just thought that filter() could be evaluated at compile time
too, as others function that I've used so far. Sometimes I don't
know if a native function can be evaluated at compile time until
I do enum x = func();
There are a few different ways to resolve this. First, std.meta
has the Filter template, which behaves much in the same way as
std.algorithm.filter, but with compile-time tuples:
static foreach (field; Filter!(isMutableString,
FieldNameTuple!C)) {
writeln(field);
}
The other option is to rewrite isMutableString to work with
run-time values:
bool isMutableString(string field) {
switch (field) {
foreach (cField; FieldNameTuple!C) {
case cField:
return is(typeof(__traits(getMember, C,
cField)) == string);
}
default:
return false;
}
}
static foreach(field; [FieldNameTuple!C].filter!(f =>
isMutableString(f))) {
writeln(field);
}
Both of these give the same output, and should be what you want.
--
Simen
That's exactly it! That Filter() from std.algorithm works like I
wanted :) nice solution also with rewrite the function to work
with run-time so that i can use with filter() but if I want to
have minimum runtime code to filter out immutable strings, the
first one is better right?
class initialization
in C# you can initilizate the class members like this:
var foo = new Foo { a = 1, b = 2 };
I found something similar to structs in D:
myStruct S = {a:1, b:2};
But can't figure out if D does have that for classes.
Web Browser
I'm used to use Qt's QWebView when I need an application to show a HTML page and change some elements on it. This time, if possible, I'd like to use D instead. Are there any web browsers ports in D?
Any sample how to use Sqlite-d?
I was looking for a library to use SQLite with D, found this (https://code.dlang.org/packages/sqlite-d) but it has no documentation or code example. I looked into files in the source code and wrote this: Database db = Database(name); auto table = db.table(tableName); auto rows = table.findRows!(format!"(id,date) => id == %s"(id)); (i'm aware of sql injection above) but it doesnt work, it seems the library has changed. If happen to that library author see this, would be very helpful.
How do I solve this kind of conflict?
I was using a Sqlite3 library then I included another library
that started the conflict. From what I could tell, it seems it's
another Sqlite3 engine that the included library uses. The link
error is:
.dub\build\application-debug-windows-x86-dmd_2076-E7D07B7BDA58325E30A3C637FC043AFE\foo.obj(ytdl)
Offset BA31FH Record Type 00C3
Error 1: Previous Definition Different : _callback
Error: linker exited with status 1
My guess is it's symbols visibility issue? and how can I solve
this?
But libraries has this defined:
extern(C) int callback(void*, int, char** , char**){
I've trid mark the one without private as such but it didn't
change anything.
NOTE: Albeit I'm using dub, both those libraries were included
directly (except the dependences of one of them).
Re: what's the point of function template declarations if they can't be defined?
On Thursday, 8 February 2018 at 07:21:05 UTC, Jonathan M Davis wrote: On Wednesday, February 07, 2018 13:39:55 Timothee Cour via Digitalmars-d- learn wrote: [...] It's useful with stuff like version(Ddoc). [...] What's a di file? (sorry google didn't help with that) It's been my understanding that it's always been illegal to provide a definition for a function that was declared previously unless it was declared in a .di file, in which case, you're not really both declaring and defining it, but the .d file is used when the module is compiled, and the .di file is used by other modules which use that module, so the declaration and definition are not seen by the same run of the compiler. - Jonathan M Davis
Re: String to binary conversation
On Monday, 5 February 2018 at 18:40:40 UTC, Steven Schveighoffer
wrote:
On 2/5/18 1:27 PM, Vino wrote:
Hi All,
Request your help on how to convert a string to binary,eg
"test" to 01110100 01100101 01110011 01110100.
import std.stdio, std.string;
writefln("%(%b %)", "test".representation);
-Steve
whoa, what isn't built-in in D...
How can I get the new stdout which changes periodically from a process?
I do call a program from my application which changes its stdout perdiodically (with ncurses library, I guess), where I'd to get somehow "notified" when some change happen (I need to new data from that changes and change my application accordingly). Currently, I do use spawnProcess() which runs the app in paralel but I have no idea how to capture periodically changes in its stdout. It doesn't need to be exact; like a notification for every single change. If it checks for changes and report if there's any, every say, x seconds is enough.
How does this error from dub mean "dlang Non-selected Y package is available with version X"?
the warning is: Non-selected package lnk is available with version ~>0.2.1. What does it mean by *Non-selected* package lnk is available? from what I could tell from the page, it's highest version. But I've tried low versions anyway to see if it Works 0.2.0, 0.1.1 etc and none did. I noticied I put "lnk": "~>0.2.1" on cachedUpgrades section so I moved there to just created "dependencies" section then the dub's error is gone but it fail to find the lnk library: Error: module lnk is in file 'lnk.d' which cannot be read some info: The package I'm trying to include is: https://code.dlang.org/packages/lnk DUB version 1.5.0, built on Sep 1 2017 DMD32 D Compiler v2.076.0 Windows 10/64bit What am I missing? I'm new to dub so everything is new to me, by now.
Re: How does this error from dub mean "dlang Non-selected Y package is available with version X"?
On Monday, 12 February 2018 at 15:51:58 UTC, Marc wrote: the warning is: Non-selected package lnk is available with version ~>0.2.1. What does it mean by *Non-selected* package lnk is available? from what I could tell from the page, it's highest version. But I've tried low versions anyway to see if it Works 0.2.0, 0.1.1 etc and none did. I noticied I put "lnk": "~>0.2.1" on cachedUpgrades section so I moved there to just created "dependencies" section then the dub's error is gone but it fail to find the lnk library: Error: module lnk is in file 'lnk.d' which cannot be read some info: The package I'm trying to include is: https://code.dlang.org/packages/lnk DUB version 1.5.0, built on Sep 1 2017 DMD32 D Compiler v2.076.0 Windows 10/64bit What am I missing? I'm new to dub so everything is new to me, by now. so I find the issue. I'm ashamed to say: I was editing the dub.json inside the dub folder not the one in the my application's root.
print enum value rather name from enum X : string
If I have an enum like this:
enum S : string {
foo = "a",
baa = "b"
}
when I printed it, to my surprise I get the enum field name
rather value:
writefln("%s v%s", S.foo, S.baa);
output:
foo vbaa
instead of
a vb
a cast solves it but without cast everywhere I need that enum
member, is there any other way to do it? otherwise I'll have to
switch to a class with static immutable strings, right?
What should I use for concat string into array in loop?
appender doesn't support string[] so in such case:
string[] output;
for(...) {
if(...) {
output ~= str;
}
}
Looking for avoid as many immediate allocations as possible, what
should I use?
Re: print enum value rather name from enum X : string
On Monday, 12 February 2018 at 17:29:47 UTC, Jonathan M Davis wrote: On Monday, February 12, 2018 17:07:50 Marc via Digitalmars-d-learn wrote: [...] If you actually use the enum values anywhere other than with anything from std.conv, std.format, or std.stdio, then when they get converted to strings, you get their actual values. It's just that those modules specifically grab the names of the enum members when converting enums to strings, since in all cases other than with strings, it's generally desirable that when converting an enum member to string, you get the name - and with enums with a base type of string, whether you want the name or the value depends on what you're trying to do. Both can be useful. So, when dealing with std.format, std.conv, and std.stdio, if you want an enum of base type string to be treated as a string, then you'll have to force it with a cast. Anywhere else, if they get converted to string, then you'll get their values. If that is unacceptable for your use case for whatever reason, then you'll have to try a different solution. What solution would then work best would presumably depend on whatever it is you're actually trying to do. - Jonathan M Davis Thanks for you always well-thought-out answer. I was going to print it with writefln() calls more than anywhere else so to avoid casts in all those places, which would make it ugly, I just used enum foo = "a"; enum baa = "b"; which I found to be more common D-idiomatic.
Could that bug be catch using D's way?
I'm pretty sure something could be done with Ada's type range but what we could do using D?
How do I trace that memory error?
I've tried both gdb and windbg debugger both it either get a "received signal ?" from gdb or crash the GUI application (windbg). The error is: core.exception.OutOfMemoryError@src\core\exception.d(696): Memory allocation failed How do I find out the source of the error?
Re: How do I trace that memory error?
On Monday, 26 February 2018 at 18:01:07 UTC, Marc wrote:
I've tried both gdb and windbg debugger both it either get a
"received signal ?" from gdb or crash the GUI application
(windbg).
The error is:
core.exception.OutOfMemoryError@src\core\exception.d(696):
Memory allocation failed
How do I find out the source of the error?
I'm allocation a class and returning it in a yield. Can it be
related?
Something like this:
Generator!Field fromCSVFile(in string csvFilename) {
return new Generator!Field({
string line;
while((line = csvFile.readln()) !is null) {
Field field = deserializeLine(line);
yield(field);
writeln("");
}
});
}
Re: How do I trace that memory error?
On Tuesday, 27 February 2018 at 14:06:19 UTC, Nicholas Wilson
wrote:
On Monday, 26 February 2018 at 18:01:07 UTC, Marc wrote:
I've tried both gdb and windbg debugger both it either get a
"received signal ?" from gdb or crash the GUI application
(windbg).
The error is:
core.exception.OutOfMemoryError@src\core\exception.d(696):
Memory allocation failed
How do I find out the source of the error?
"received signal ?" seems like the one of the GC signals used
for stopping threads.
just get gdb to ignore those.
An attempt to continue results in crash.
I also added in my foreach's body:
scope(exit) {
import core.memory : GC;
GC.collect();
}
But also doesn't solve the issue.
Re: How do I trace that memory error?
On Tuesday, 27 February 2018 at 15:08:23 UTC, Stefan Koch wrote: On Monday, 26 February 2018 at 18:01:07 UTC, Marc wrote: I've tried both gdb and windbg debugger both it either get a "received signal ?" from gdb or crash the GUI application (windbg). The error is: core.exception.OutOfMemoryError@src\core\exception.d(696): Memory allocation failed How do I find out the source of the error? I'd say allocating in a loop is a bad idea :) perhaps you should start with posting the code that leads to this. The code is that one on my second post. The deserializeLine() create allocate instance of Field then return. So yeah, I'm allocating on loop but I don't doing too much. I was watching the memory usage of the application (with win10 taskbar memory usage feature) and I saw it uses only about 4mb on 8gb machine. I've tried build a 64bit executable but I got same error.
Re: How do I trace that memory error?
On Tuesday, 27 February 2018 at 15:08:23 UTC, Stefan Koch wrote: On Monday, 26 February 2018 at 18:01:07 UTC, Marc wrote: I've tried both gdb and windbg debugger both it either get a "received signal ?" from gdb or crash the GUI application (windbg). The error is: core.exception.OutOfMemoryError@src\core\exception.d(696): Memory allocation failed How do I find out the source of the error? I'd say allocating in a loop is a bad idea :) perhaps you should start with posting the code that leads to this. I've also tried to create only one instance: create a local variable inside the method then reuse it. I get same error. No debugg tool has helped so far.
Re: How do I trace that memory error?
On Tuesday, 27 February 2018 at 16:55:27 UTC, Marc wrote:
[...]
So deep down the error is in that method which I call from
deserializeLine() function:
void setValue(T, V)(auto ref T aggregate, string field, V
value) {
writeln("setting {", field, "} to {", value, "}");
import std.traits : FieldNameTuple;
import std.meta : Alias;
switch (field) {
foreach (fieldName; FieldNameTuple!T) {
case fieldName:
static if (is(typeof(__traits(getMember,
aggregate, fieldName) = value))) {
__traits(getMember, aggregate, fieldName)
= value;
return;
} else {
assert(false, T.stringof ~ "."~field~" cannot
be assigned from a "~V.stringof~".");
}
}
default:
assert(false, T.stringof ~ " has no field named
"~field~".");
}
}
the function is used like this:
Field field = new Field();
foreach(CSVLinkedIndex linkedIndex; linkedIndexes) {
string value =
values[linkedIndex.csv_column_index];
setValue(field, linkedIndex.field_member,
value);
}
which eventually (in about 8 calls) return the error:
core.exception.OutOfMemoryError@src\core\exception.d(702):
Memory allocation failed
it uses about 4MB in a 8GB machine then crashs. It's return by
the top function using yield:
yield(field);
But I can't find out why gc fails to allocate at some point. In
fact, I've forced the gc to do so in my top loop:
foreach(Field field; deserializeFile()) {
scope(exit) {
import core.memory : GC;
GC.collect();
}
}
Which didn't solve the issue.
What's the proper way to add a local file dependence to dub?
then copy it to sources folder? let's say I have a small library folder at C:\mylibrary\D where I want to use dir.d from it. How do I add that file dependence to dub? But I do not want to that file be passed directly to dmd, I want to that file be copied to application's source folder (so it's easy to distribuite, with the dependences together as possible) then compiled. So, what I want to some extension is dub work with loca files. Is this possible to do solely with dub? I know I can easily write a script to run before dub which copies the dependence files from C:\mylibrary to application's source but I'm looking for a more elegant approach as possible; I'm afraid of rewriting a makefile-like soon (I find cmake/make/makefiles just ugly).
Any crash reporter for D?
Does anyone knows about any crash repórter library for D? there's nothing I couldn't find at code packages. Something as simple and easy to use like this C#'s https://archive.codeplex.com/?p=crashreporterdotnet
Re: Speed of math function atan: comparison D and C++
On Monday, 5 March 2018 at 05:35:28 UTC, J-S Caux wrote: I'm considering shifting a large existing C++ codebase into D (it's a scientific code making much use of functions like atan, log etc). I've compared the raw speed of atan between C++ (Apple LLVM version 7.3.0 (clang-703.0.29)) and D (dmd v2.079.0, also ldc2 1.7.0) by doing long loops of such functions. I can't get the D to run faster than about half the speed of C++. Are there benchmarks for such scientific functions published somewhere? What compiled flags did you used to compile both C++ and D versions?
Re: How to use globals correctly?
On Monday, 5 March 2018 at 18:57:01 UTC, Steven Schveighoffer wrote: On 3/5/18 1:35 PM, Robert M. Münch wrote: If I use VisualD and add a watch on myObj, I don't see anything just a "identifier myObj is undefined". Not sure if this is because of some threads running (using the D RX framework). Can't answer your visual D questions... So, some questions: 1. Are myMemb1..N TLS or __gshared as well? No, they are on the heap. Only the reference is __gshared. But effectively it is __gshared, since you can reach those items via the global `myObj`. 2. How to best implement a simple global to keep track of values (with support for threads)? shared is the best mechanism, and you don't have to make it a class, it can be a struct. This is only if you are using it as POD (plain old data). If you want to have methods, shared kind of sucks. But this at least tells the type system that it's shared between threads. __gshared does not, it just sticks it in global space, but pretends it's not shared data. -Steve Can __gshared be used instead of static in the singleton pattern? I, comming from C++, ignorantly, have never used _gshared so I went to static instead of (being static also means thread-safe, as far I know)...
Are files in dub's "copyFiles" copied every time dub is run?
if so, can I somehow make it copy only if newest?
dub preBuildCommand not working
I added the followiing to my dub.json: "preBuildCommand": [ "C:\\Users\\user003\\Desktop\\Nova pasta\\a.exe", "C:\\dm\\bin\\rcc.exe -32 -D__NT__ res.rc -o sources\\res.res" ] But neither command is executed. "C:\\Users\\user003\\Desktop\\Nova pasta\\a.exe" is a D application created by myself to check if that command is being run. It creates a text file when it does run. What possibily can be? I've tried: dub dub --build=debug dub --build-release and dub clear then all the build attempts again but none worked. I getting to know dub so I still have no idea what can be.
Setting executable's information by resources
I'm trying to use this resource to set executable's information/metadata but it fail to set anything but the icon, without any error message. Could anyone point out if there's anything wrong with my approach? (if anyone use a different approach/toolset to set those data, your suggestion is very welcome) commands: C:\dm\bin\rcc.exe -32 -D__NT__ res.rc dmd app.d res.res resource file IDI_ICON1 ICONDISCARDABLE "ico.ico" #include "version.h" VS_VERSION_INFO VERSIONINFO FILEVERSION VER_FILEVERSION PRODUCTVERSION VER_PRODUCTVERSION BEGIN BLOCK "StringFileInfo" BEGIN BLOCK "040904E4" BEGIN VALUE "CompanyName",VER_COMPANYNAME_STR VALUE "FileDescription",VER_FILEDESCRIPTION_STR VALUE "FileVersion",VER_FILEVERSION_STR VALUE "InternalName", VER_INTERNALNAME_STR VALUE "LegalCopyright", VER_LEGALCOPYRIGHT_STR VALUE "LegalTrademarks1", VER_LEGALTRADEMARKS1_STR VALUE "LegalTrademarks2", VER_LEGALTRADEMARKS2_STR VALUE "OriginalFilename", VER_ORIGINALFILENAME_STR VALUE "ProductName",VER_PRODUCTNAME_STR VALUE "ProductVersion", VER_PRODUCTVERSION_STR END END BLOCK "VarFileInfo" BEGIN VALUE "Translation", 0x409, 1252 END END
How can I get notified when an process created by spawnShell() has exit?
I do need to start (up to 4 a time) processes in parallel but I'd like to get notified (similar to C#'s Process.Exited Event) when the process exits. How can I do that in D?
Re: issue with inf from exp function
On Wednesday, 7 March 2018 at 16:06:26 UTC, Matt Gamble wrote: On Wednesday, 7 March 2018 at 16:00:39 UTC, Alex wrote: On Wednesday, 7 March 2018 at 15:44:28 UTC, Matt Gamble wrote: [...] works for me as expected. ln(largest double) = 709.783 e^710 = inf ln(largest real) = 11356.5 e^710 = 2.23399e+308 Really? Is it my system? I'm running windows 10, with an intel Core i7-4650, 64bit operating system I compiled with -m64 -g -unittest -main Did notice you were using -m64 flag before. Well, now I used -m64 the same code doesn't work as expected. I also got inf.
Re: issue with inf from exp function
On Wednesday, 7 March 2018 at 16:00:39 UTC, Alex wrote:
On Wednesday, 7 March 2018 at 15:44:28 UTC, Matt Gamble wrote:
I don't understand why I'm getting an 'inf' by raising E to a
real number, e^^710.0L. See below.
import std.stdio;
import std.math;
unittest
{
writefln("ln(largest double) = %s", log(double.max)); //
709.783
writefln("e^710 = %s", exp(710.0));// inf, makes sense
writefln("ln(largest real) = %s", log(real.max)); // 11356.6
real t = 710.0;
writefln("e^710 = %s", exp(t)); //why is this inf???
}
Any help would be greatly appreciated. I have functions in an
actual program that are giving me a headache due to this issue.
works for me as expected.
ln(largest double) = 709.783
e^710 = inf
ln(largest real) = 11356.5
e^710 = 2.23399e+308
it works for me too.
https://imgur.com/bLGTv1l
Re: issue with inf from exp function
On Wednesday, 7 March 2018 at 16:12:28 UTC, Matt Gamble wrote: On Wednesday, 7 March 2018 at 16:10:15 UTC, Marc wrote: On Wednesday, 7 March 2018 at 16:00:39 UTC, Alex wrote: On Wednesday, 7 March 2018 at 15:44:28 UTC, Matt Gamble wrote: [...] works for me as expected. ln(largest double) = 709.783 e^710 = inf ln(largest real) = 11356.5 e^710 = 2.23399e+308 it works for me too. https://imgur.com/bLGTv1l Wow, Now I'm really confused, I'm using DMD v2.076.1. Any thoughts I why I'm getting this result? See my previous post. It's something related to generating 64bit code.
how do I pass this callback?
How do I define the callback so that it can be used in RegisterWaitForSingleObject()? I've tried pass as argument: myFunc &myFunc myFunc.ptr none worked. Here's my code: extern (C) void OnExited(void* context, BOOLEAN isTimeOut); extern(Windows): BOOL RegisterWaitForSingleObject( PHANDLE phNewWaitObject, HANDLE hObject, WAITORTIMERCALLBACK Callback, PVOID Context, ULONG dwMilliseconds, ULONG dwFlags ); Function call: RegisterWaitForSingleObject(&hWait, hProcess, &OnExited, NULL, INFINITE, WT_EXECUTEONLYONCE); Error: function a.RegisterWaitForSingleObject(void** phNewWaitObject, void* hObject, extern (Windows) void function(void*, bool) Callback, void* Context, uint dwMilliseconds, uint dwFlags) is not callable using argument types (void**, void*, extern (C) void function(void* context, bool isTimeOut), typeof(null), uint, uint) a.d(38):cannot pass argument & OnExited of type extern (C) void function(void* context, bool isTimeOut) to parameter extern (Windows) void function(void*, bool) Callback
Re: how do I pass this callback?
On Thursday, 8 March 2018 at 17:06:05 UTC, Marc wrote: How do I define the callback so that it can be used in RegisterWaitForSingleObject()? I've tried pass as argument: myFunc &myFunc myFunc.ptr none worked. Here's my code: [...] Function call: [...] Error: [...] Solved! I shall rather use extern (Windows) not extern(C): extern (Windows) void OnExited(void* context, BOOLEAN isTimeOut);
overload binary + operator to work with different types
I want to basically make this work:
auto l = new List();
l += 5;
I managed to do this:
class List
{
int[] items;
ref List opBinary(string op)(int rhs) if(op == "+")
{
items ~= rhs;
return *this;
}
}
Note the ref in the fucntion return, I also want to return a
reference to the class so that this Works:
l += 5 + 8 + 9 ... ;
Could someone point out how do that/what's wrong with my attempy?
Re: overload binary + operator to work with different types
On Tuesday, 13 March 2018 at 19:05:00 UTC, Jonathan M Davis wrote:
On Tuesday, March 13, 2018 18:55:35 Marc via
Digitalmars-d-learn wrote:
I want to basically make this work:
>[...]
I managed to do this:
> [...]
}
Note the ref in the fucntion return, I also want to return a
reference to the class so that this Works:
> [...]
Could someone point out how do that/what's wrong with my
attempy?
+ is overloaded with opBinary, and += is overloaded using
opOpAssign:
https://dlang.org/spec/operatoroverloading.html#op-assign
http://ddili.org/ders/d.en/operator_overloading.html
- Jonathan M Davis
Soon as I posted I found out opOpAssign.
I've had got close than I thought:
List opOpAssign(string op)(int rhs) if(op == "+")
{
items ~= rhs;
return this;
}
Thanks!
Why does file order matters when using -run option?
assume the files:
app.d
void main() {
import myModule : foo;
writeln(foo(...));
}
myModule.d
module myModule;
int foo(int n) { }
the following fail:
dmd -run app.d mymodule.d
give error like this:
Error: module `myModule` is in file 'myModule.d' which cannot
be read
but this doesn't fail:
dmd app.d mymodule.d && app
Why does -run fail here? I thought it was a shorthand to this
batch:
dmd app.d mymodule.d
app.exe
del app.exe
How do I make only the array itself immutable?
Can I make it work?
struct S
{
int[] l;
}
then
auto s = S();
s.l ~= 1; // ok
s.l = []; // error
Re: Mir blas keeps giving an error
I have updated the examples by adding a subconfiguration of mi-blas. Now it works.
Re: Mir blas keeps giving an error
On Tuesday, 12 August 2025 at 07:13:58 UTC, Serg Gini wrote: BLAS can be a tricky-to-install library. Please provide your OS, dub.json/sdl and check that BLAS is installed. The examples dub.sdl is available here: https://github.com/istmarc/mir-examples/blob/main/dub.sdl . I've Archlinux installed with openblas (`/usr/lib/libopenblas.so`) and lapack (`/usr/lib/liblapack.so`). I can use them from c++ simply by linking `clang++ -lbopenblas main.cxx` and both work fine.
Re: How to plot a simple scatter plot using ggplotd
On Tuesday, 12 August 2025 at 07:18:45 UTC, Serg Gini wrote:
```d
auto gg = xs.zip(ys)
.map!((t) => aes!("x","y")(t[0], t[1]))
.geomPoint.putIn(GGPlotD());
```
Some examples can be found here:
https://blackedder.github.io/ggplotd/example.html
https://blackedder.github.io/ggplotd/ggplotd/ggplotd/GGPlotD.html
Thanks for your reply. Finally I got it to work. The code is the
following
```d
import std.stdio;
import std.array;
import mir.ndslice;
import ggplotd.aes: aes, Aes;
import ggplotd.axes: xaxisLabel, yaxisLabel;
import ggplotd.ggplotd: GGPlotD, putIn;
import ggplotd.geom: geomPoint, geomBox, geomLine;
void main()
{
auto x = [1.47f, 1.50f, 1.52f, 1.55f, 1.57f, 1.60f, 1.63f,
1.65f, 1.68f, 1.70f, 1.73f, 1.75f, 1.78f, 1.80f,
1.83f].sliced(15);
auto y = [52.21f, 53.12f, 54.48f, 55.84f, 57.20f, 58.57f,
59.93f, 61.29f, 63.11f, 64.47f, 66.28f, 68.10f, 69.92f, 72.19f,
74.46f].sliced(15);
auto xs = x.array;
auto ys = y.array;
auto a = Aes!(float[], "x", float[], "y")(xs, ys);
auto gg = geomPoint(a).putIn(GGPlotD());
gg.save("scatter.png");
}
```
Re: Mir blas keeps giving an error
On Tuesday, 12 August 2025 at 10:05:59 UTC, Serg Gini wrote: On Tuesday, 12 August 2025 at 09:44:07 UTC, Nice. I've checked your repos - you probably also could be interested in projects: - Mojo lang, where tensors are integrated into the language https://docs.modular.com/max/api/c/tensor/ - GGML C++ library for tensors, used in llama.cpp https://github.com/ggml-org/ggml Those are great resources. Thanks a lot for your reply. I started writting a tensor library mainly to extend Eigen c++ library that has an unsupported tensor module. It’s great for numerical stuffs but doesn’t support for example slicing like numpy and Mir except for rows and columns of a matrix. Im not sure about how they approached this so that might be very interesting thing I could check.
How to plot a simple scatter plot using ggplotd
Hello everyone,
I am trying to use ggplotd to visualize a data set before and
after fitting a linear model. how ever i'm struggling to get it
to work with a simple example. I tried the following and i get
errors for boths:
```d
import mir.ndslice;
import ggplotd.aes: aes, Aes;
import ggplotd.axes: xaxisLabel, yaxisLabel;
import ggplotd.ggplotd: GGPlotD, putIn;
import ggplotd.geom: geomPoint, geomBox, geomLine;
void main(){
auto x = [1.47f, 1.50f, 1.52f].sliced(3);
auto y = [52.21f, 53.12f, 54.48f].sliced(3);
auto xs = x.array;
auto ys = y.array;
auto gg = aes!("x", "y")(xs, ys).geomPoint;
// or
auto gs = aes!("x", "y")(xs, ys).array.geomPoint;
}
```
I would appreciate any help or advice on getting it to work.
Mir blas keeps giving an error
Using mir-blas is fundamental for implementing linear models in D. However it keeps giving an error, other mir libraries work fine. I get the following error ```shell /usr/bin/ld: -f may not be used without -shared clang: error: linker command failed with exit code 1 (use -v to see invocation) Error: linker exited with status 1 ``` I would appreciate if anyone can help me setting it up.
Re: Template instance does not match template declaration
On Friday, 15 August 2025 at 12:20:16 UTC, Sergey wrote:
On Friday, 15 August 2025 at 12:02:19 UTC, Marc wrote:
Hello,
I'm trying to declare a templated member function that takes a
value of size_t N. A simple example to reproduce what Im
trying to do is the following:
```d
import std.stdio;
void getCol(N: size_t)() {
return N;
}
void main() {
// Call
writeln(getCol!0());
}
```
I get the following error: `Error: template instance
`getCol!0` does not match template declaration `getCol(N :
ulong)()`
writeln(getCol!0());
^
Error dmd failed with exit code 1.`
Can anyone please help me getting it to work?
D doesn't use ":" for types
```d
import std;
size_t getCol(size_t N)() {
return N;
}
void main() {
// Call
writeln(getCol!0());
}
```
Thanks for your reply. It solved my problem.
Re: Template instance does not match template declaration
On Friday, 15 August 2025 at 12:18:30 UTC, 0xEAB wrote:
On Friday, 15 August 2025 at 12:02:19 UTC, Marc wrote:
Can anyone please help me getting it to work?
It seems like you’ve accidentally used the wrong syntax for the
template parameter.
To make the parameter a value parameter of type `size_t`, write:
```
size_t getCol(size_t N)() {
return N;
}
```
Also, your return type was off. Can’t return data from a `void`
function.
Thanks. It work now.
Template instance does not match template declaration
Hello,
I'm trying to declare a templated member function that takes a
value of size_t N. A simple example to reproduce what Im trying
to do is the following:
```d
import std.stdio;
void getCol(N: size_t)() {
return N;
}
void main() {
// Call
writeln(getCol!0());
}
```
I get the following error: `Error: template instance `getCol!0`
does not match template declaration `getCol(N : ulong)()`
writeln(getCol!0());
^
Error dmd failed with exit code 1.`
Can anyone please help me getting it to work?
Re: Typed data frames in D
On Saturday, 16 August 2025 at 20:51:35 UTC, Dejan Lekic wrote: The only one I know is this one: https://github.com/navid-m/parallax This one looks good overall.
Typed data frames in D
Hi, I'm trying to implement data frames in D based on mir slices. I'm not sure if there's a better approach. Currently support just basic slicing and assignment. Are there any efforts in the community toward this goal. What features would you like to see in the data frame? Any ideas or feature request would be appreciated. https://github.com/istmarc/typeddataframe
