I use some C library that uses structs and many functions that use
pointer to structs as arguments:
struct A {...};
myfunc(A *myA);
In C you can do this to get a lvalue:
myfunc(&(A){...});
In D this doesn't work and I get an "is not an lvalue and cannot be modified".
What's the correct
On 2019-05-01 14:23:37 +, Alex said:
On Wednesday, 1 May 2019 at 12:47:22 UTC, Robert M. Münch wrote:
I use some C library that uses structs and many functions that use
pointer to structs as arguments:
struct A {...};
myfunc(A *myA);
In C you can do this to get a lvalue:
On 2019-05-01 19:13:54 +, Alex said:
Doesn't work because this seems to kick in some D releated run-time
stuff which lead to unresolved externals during linking:
error LNK2001: Nicht aufgelöstes externes Symbol "...__initZ".
error LNK2001: Nicht aufgelöstes externes Symbol
On 2019-05-06 17:04:47 +, Adam D. Ruppe said:
I'd make that thing's constructor private, and then offer a helper
template function that actually creates it and the user passes a type.
Any reason why makeing things private? The struct is more like an
application state to avoid globals.
On 2019-05-07 09:06:03 +, Kagamin said:
struct myFramework {
myFrameworkAccessor myFWApp;
}
interface myFrameworkApp {
void init();
}
main(){
myFramework mf = new myFramework;
mf.myFWApp.init(); // this bombs because myFWApp is NULL
}
struct
On 2019-05-06 18:21:27 +, Adam D. Ruppe said:
Just the constructor. It is so they don't try to skip a step calling
the constructor themselves. But, of course, it doesn't have to be
private.
Ok, that makes sense.
What I want to avoid is that explicit init line in main().
I did things
On 2019-05-07 09:06:03 +, Kagamin said:
struct myFramework {
myFrameworkAccessor myFWApp;
}
interface myFrameworkApp {
void init();
}
main(){
myFramework mf = new myFramework;
mf.myFWApp.init(); // this bombs because myFWApp is NULL
}
struct
On 2019-05-07 09:06:03 +, Kagamin said:
struct myFramework {
myFrameworkAccessor myFWApp;
}
interface myFrameworkApp {
void init();
}
main(){
myFramework mf = new myFramework;
mf.myFWApp.init(); // this bombs because myFWApp is NULL
}
struct
On 2019-05-07 17:43:57 +, H. S. Teoh said:
Note: it's a very bad idea to call a member function 'init'. It
conflicts with the built-in .init property of all types, and can lead to
strange bugs / confusing behaviours.
Call it something else, like 'initialize'.
Yes, thanks. I'm currently
On 2019-05-07 18:02:16 +, Ron Tarrant said:
I'm curious. What's the ultimate aim of the framework you're working
on? An aid to building web apps? Desktop apps?
The goal is to have a generic framework for desktop apps where you can
directly start to work on the app and don't have to care
I want to build a framework which gives some structure to the app using
it. To create this structure I would like to use interfaces. The
application then uses these interfaces and implements the required
functions. I want to provide a clear initialization sequence for the
app through the
A/a.d has module A.a;
A/b.d has module A.b;
A/package.d
import A.a;
import A.b;
A.b needs to access something from A.a
I assumed if I do
import package.d
that A.b sees the content of A.a now and doens't need an explicit line with
a/b.d
import A.a;
But this
On 2019-04-27 15:06:01 +, Adam D. Ruppe said:
On Saturday, 27 April 2019 at 14:58:01 UTC, Robert M. Münch wrote:
import A.a;
`import` by itself is a private import, meaning it cannot be seen from
outside the module.
Make it `public import` and it can be seen from the outside;
On 2019-04-27 09:40:46 +, Jacob Carlborg said:
I created an enhancement request for this. Hopefully it's possible to
fix without having the user installing the SDK in /usr/include.
https://github.com/jacob-carlborg/dstep/issues/227
Thanks! Your tip worked and yes, OSX out of the box
On 2019-04-28 11:44:03 +, Mike Parker said:
They're different symbols because they're in different modules. The
module and package name is part of the symbol name.
Ok, that's what I assumed too.
Just import A.b in A.a.
Won't help. I just commented the lines DStep generated for
On 2019-04-27 16:30:48 +, Adam D. Ruppe said:
There is no "same level" really (except for the `package` protection
level); it is just inside the module or outside the module for imports.
Hi Adamn, ok, got it. The docs are indicating that the "public import"
is only working along the
On 2019-04-27 16:30:48 +, Adam D. Ruppe said:
This will never work in D. The module needs to work by itself. It can
see public imports from another module it itself imports:
module A.c;
import A; // thanks to this, it can see a `public import A.a;` from the
A package..
But without
On 2019-04-28 16:18:59 +, kdevel said:
This compiles with dmd v2.085.1:
$ cat A/a.d
module A.a;
import A.b;
$ cat A/b.d
module A.b;
struct myStruct {
int i;
}
$ cat A/c.d
module A.c;
import A.a;
import A.b;
struct myOtherStruct {
myStruct ms;
}
void main ()
{
import
On 2019-05-08 09:15:41 +, Ron Tarrant said:
This sounds like a complete replacement for either QT, MFC, or GTK as
well as Glade/QT Designer all rolled into one.
Let's say it's an alternative ;-)
All the ones you listed are either too big, too complicated, bring too
much stuff that we
I have something like:
template myStruct(T){
auto makeMyStruct(T,E)(T context, void delegate(E) myFunc){
static struct myObject {
this(T context, void delegate(E) myFunc){
_context = context;
On 2019-07-03 19:07:10 +, ag0aep6g said:
On 03.07.19 20:20, Robert M. Münch wrote:
So, I need to carry around the object from which a delegate was created
from because it's not possible to query the delegate for the object
later somewhere else in the code.
It is possible to get the
struct IM;
struct C {
IM *impl;
};
int cInit(C* self);
class I {
C handler;
this(){cInit();}
}
Is there a simple way that I can use handler without the address-of
operator and automatically get *impl?
Something like:
class I {
C handler;
I'm trying the new DStep version but have some problems with standard
include files:
=> dstep --output ./d -v -I/opt/local/libexec/llvm-5.0/include/c++/v1
myinclude.h
clang version 5.0.2 (tags/RELEASE_502/final)
Target: x86_64-apple-darwin18.5.0
Thread model: posix
InstalledDir:
ignoring
On 2019-06-30 17:47:27 +, a11e99z said:
Private means that only members of the enclosing class can access the
member, or
vvv
members and functions in the same module as the enclosing class.
Is it possible to pack a complete "web-app" (serving web-pages and
providing REST API) into a single executable so that no other files
need to be accessed and everything is servered from something like a
"virtual filesystem" which is in memory only?
--
Robert M. Münch
http://www.saphirion.com
On 2019-07-28 14:14:06 +, Sebastiaan Koppe said:
I am using https://dlang.org/spec/expression.html#import_expressions
for text files. Don't know if it works on binary files as well.
And this works than good together with the vibe framework? So, it's not
requiring or forcing one to use
I have a case, with templates, where an assert in a unittest can access
a private memember and I don't know how this can happen.
Before trying to creat an equivalent case, I want to cross-check, if
assert has special semantics in a unittest so that it can access
private memembers?
--
Robert
On 2019-06-12 13:58:49 +, Meta said:
There are two versions of find that can find a range within another:
https://dlang.org/phobos/std_algorithm_searching.html#.find
https://dlang.org/phobos/std_algorithm_searching.html#.find.3
Thanks, that looks good. I read the find docs, but somehow
How does the observerObject Template and function work? I'm struggling
because both use the same name and how is the template parameter R
deduced/where is it coming from? Looks like it's somehow implicitly
deduced.
class ObserverObject(R, E...){...}
template observerObject(E)
{
On 2019-10-29 17:43:47 +, H. S. Teoh said:
On Tue, Oct 29, 2019 at 04:54:23PM +, ixid via Digitalmars-d-learn wrote:
On Tuesday, 29 October 2019 at 16:11:45 UTC, Daniel Kozak wrote:
On Tue, Oct 29, 2019 at 5:09 PM Daniel Kozak wrote:
AFAIK dmd use real for floating point operations
On 2019-10-31 16:07:07 +, H. S. Teoh said:
Maybe you might be interested in this:
https://stackoverflow.com/questions/6769881/emulate-double-using-2-floats
Thanks, I know the 2nd mentioned paper.
Maybe switch to PPC? :-D
Well, our customers don't use PPC Laptops ;-)
On 2019-11-14 13:08:10 +, Mike Parker said:
Contents, ErrorLevel, Range, and Separator are template (i.e.
compile-time) parameters. Input, delimiter, and quote are function
(i.e. runtime) parameters.
Mike, thanks a lot... I feel like an idiot. As casual D programmer the
template-syntax
I have:
JSONValue j = parseJSON(json_string).object;
writeln(j);// works
writeln(j["a"]); // works
writeln(j["a"].object["b"]); // bombs
Runtime error: std.json.JSONException@std/json.d(276):
On 2019-11-15 17:23:38 +, Steven Schveighoffer said:
On 11/15/19 12:05 PM, Robert M. Münch wrote:
JSONValue j = parseJSON(json_string).object;
writeln(j); // works
writeln(j["a"]); // works
writeln(j["a"].object["b"]); // bombs
On 2019-10-29 23:28:35 +, Simen Kjærås said:
On Tuesday, 29 October 2019 at 22:24:20 UTC, Robert M. Münch wrote:
I quite often have the pattern where a value should be read just once
and after this reset itself. The idea is to avoid that others read the
value by accident and get an older
On 2019-12-03 16:34:43 +, Robert M. Münch said:
I have very strange casting error I don't understand:
alias typeof(windows_message_streams[WM_MOUSEMOVE].filter!(win =>
(win.wParam & MK_LBUTTON))) WM_MOUSEMOVE_LBUTTON_TYPE;
WM_MOUSEMOVE_LBUTTON_TYPE WM_MOUSEMOVE_LBUTTON_STREAM;
I have very strange casting error I don't understand:
alias typeof(windows_message_streams[WM_MOUSEMOVE].filter!(win =>
(win.wParam & MK_LBUTTON))) WM_MOUSEMOVE_LBUTTON_TYPE;
WM_MOUSEMOVE_LBUTTON_TYPE WM_MOUSEMOVE_LBUTTON_STREAM;
pragma(msg,typeof(WM_MOUSEMOVE_LBUTTON_STREAM));
On 2019-12-03 16:34:43 +, Robert M. Münch said:
I have very strange casting error I don't understand:
alias typeof(windows_message_streams[WM_MOUSEMOVE].filter!(win =>
(win.wParam & MK_LBUTTON))) WM_MOUSEMOVE_LBUTTON_TYPE;
WM_MOUSEMOVE_LBUTTON_TYPE WM_MOUSEMOVE_LBUTTON_STREAM;
On 2019-12-04 19:23:07 +, Steven Schveighoffer said:
Is one a delegate and one a function pointer? This can easily happen
for untyped lambdas.
Not sure if the code-snippets already give an explanation but the
differences I have are:
1. Working case
template filter(alias pred)
{
On 2019-12-04 19:23:07 +, Steven Schveighoffer said:
Is one a delegate and one a function pointer? This can easily happen
for untyped lambdas.
That's a very good point and hint. A function pointer will be 8LU and a
delegate 16LU, right? This is a strong argument that this is really the
I get this error message, which doesn't tell me a lot:
rx_filter_subject.d(38,8): Error: class rx_filter_subject.FilterSubject
use of
rx.subject.SubjectObject!(message).SubjectObject.subscribe(Observer!(message)
observer) is hidden by FilterSubject; use alias subscribe =
On 2019-10-24 19:45:42 +, Ali ehreli said:
One practical reason is, the number of their instances cannot be known
when the interface (or base class) is compiled.
...
Ali, first, thanks a lot for your answers.
If the compiler is a 1-pass one I see the problem, otherwise one could
On 2019-10-21 07:04:33 +, John Chapman said:
This should work:
class FilterSubject : SubjectObject!message {
alias subscribe = typeof(super).subscribe;
Disposable subscribe(myWidget observer){...}
}
This now gives:
rx_filter_subject.d(66,23): Error:
On 2019-10-23 17:22:38 +, Ali ehreli said:
On 10/23/2019 02:43 AM, Robert M. Münch wrote:
>> Unfortunately, member function template instances are never virtual
>> functions, so you can't override them.
>
> What I don't understand is:
>
> 1. The RX lib has a member function
I quite often have the pattern where a value should be read just once
and after this reset itself. The idea is to avoid that others read the
value by accident and get an older state, instead they get an
"invalid/reset" value.
Is there a library function that can mimic such a behaviour?
--
On 2019-10-21 18:02:06 +, Robert M. Münch said:
This now gives:
rx_filter_subject.d(66,23): Error:
rx_filter_subject.FilterSubject.subscribe called with argument types
(myWidget) matches both:
/Users/robby/.dub/packages/rx-0.13.0/rx/source/rx/subject.d(72,16):
On 2019-10-25 15:20:21 +, Ali ehreli said:
On 10/25/2019 07:34 AM, Robert M. Münch wrote:
> If the compiler is a 1-pass one I see the problem, otherwise one could
> first get a "total overview" and create the necessary vtbl entries after
> everything is known. Maybe this is not "how a
On 2019-10-24 16:03:26 +, Dukc said:
We're planning to have our product preview program to calculate and
suggest a price for the product displayed. There are a lot of variables
to take into account, so it's essential the users can edit the price
variables themselves.
Hi, maybe you want
On 2019-10-22 20:59:41 +, Ali ehreli said:
That says "private paste" for me.
Ups, sorry and thanks for letting me know.
But I think you have a member function template in the base class.
This the lib I use:
https://github.com/lempiji/rx/blob/dev/source/rx/subject.d and which
How can I write something like this to check if any of a set of
specific versions is used?
static assert(!(version(a) | version(b) | version(c)):
The problem is that I can use version(a) like a test, and the symbol a
is not accessbile from assert (different, non-accessible namespace).
--
On 2019-11-28 16:36:36 +, Jacob Carlborg said:
Are you using the latest version, 2.089.0? It might be fixed in that
version [1].
[1] https://dlang.org/changelog/2.089.0.html#mixin_template_mangling
Ha! Thanks Jacob, that looks like the root-cause. Didn't expect to use
a feature which
On 2019-11-27 18:50:07 +, Johan Engelen said:
On Tuesday, 26 November 2019 at 12:53:02 UTC, Jonathan M Davis wrote:
On Tuesday, November 26, 2019 4:29:18 AM MST S.G via Digitalmars-d-learn wrote:
On Tuesday, 26 November 2019 at 10:24:00 UTC, Robert M. Münch
wrote:
How can I write
On 2019-10-30 15:12:29 +, H. S. Teoh said:
It wasn't a wrong *decision* per se, but a wrong *prediction* of where
the industry would be headed.
Fair point...
Walter was expecting that people would move towards higher precision,
but what with SSE2 and other such trends, and the general
Just trying a very simple thing and it's pretty hard: "Read a CSV file
(raw_data) that has a ; separator so that I can iterate over the lines
and access the fields."
csv_data = raw_data.byLine.joiner("\n")
From the docs, which I find extremly hard to understand:
auto
I have:
a.d:
extern (C) void myFuncA();
void myFuncB() {
myFuncA();
}
b.d:
public import a;
mixin template MYFUNCA() {
extern (C) void myFuncA() {...}
}
c.d:
import b;
mixin MYFUNCA;
...further code...
Compiling such a structure gives me an unresolved external in
I have two project I want to compile and both times get this error:
Undefined symbols for architecture x86_64:
"_dyld_enumerate_tlv_storage", referenced from:
__d_dyld_getTLSRange in libphobos2.a(osx_tls.o)
I'm wondering where this comes from as I didn't see it in the past. Any idea?
--
On 2019-10-10 18:31:25 +, Daniel Kozak said:
What dmd version?
I think I had an older one like 2.085 or so. I updated to 2.088 and it
now seems to work.
https://issues.dlang.org/show_bug.cgi?id=20019
I'm on OSX 10.14.6, so this might not be directly related to Catalina
but maybe
On 2019-10-11 18:09:01 +, Jacob Carlborg said:
No, I don't think that's the problem. I have the same setup and I don't
have this problem.
Interesting... but the update seems to have solved the problem. Maybe
some old DMD compiler stuff lying around got in the way.
What result do you
I want to do all the basics mutating things with strings: append,
insert, replace
What is the D-ish way to do that since string is aliased to immutable(char)[]?
Using arrays, using ~ operator, always copying, changing, combining my
strings into a new one? Does it make sense to think about
Want to add I'm talking about unicode strings.
Wouldn't it make sense to handle everything as UTF-32 so that iteration
is simple because code-point = code-unit?
And later on, convert to UTF-16 or UTF-8 on demand?
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
I have quite often this pattern:
with(x.y.z){
xyzFunc(); // = x.y.z.xyzFunc()
myFunc(x.y.z, ...);
}
and it would be cool to write:
with(t = x.y.z){ // work like an implicit alias
xyzFunc(); // = x.y.z.xyzFunc()
myFunc(t, ...);
}
Is there anything
I want to use a specific branch version if a package. I specified the
branch version in a dub.selections.json file.
But it seems that dub requires a ZIP file that can be downloaded from
code.dlang.org, which of course fails because the branch is only
available on github.
Fetching rtree
I don't get how I can create a dynamic array of Cycle buffers of size 2
which use a struct.
struct ms {
int a;
int b;
}
ms[2] msBuffer;
alias circularStructBuffersT = typeof(cycle(msBuffer));
circularStructBuffersT[int] circularStructBuffers;
int i = 2;
auto x =
Hi, I had a related question in the "Does -profile need the D runtime?" thread.
Since D runtime is required for profile to work, the question is how
can I use profile when initializing it myself?
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
On 2019-12-27 19:44:59 +, H. S. Teoh said:
Since graphemes are variable-length in terms of code points, you can't
exactly *edit* a range of graphemes -- you can't replace a 1-codepoint
grapheme with a 6-codepoint grapheme, for example, since there's no
space in the underlying string to
On 2019-12-27 17:54:28 +, Steven Schveighoffer said:
This is the rub with ranges. You need to use typeof. There's no other
way to do it, because the type returned by byGrapheme depends on the
type of Range.
Hi, ok, thanks a lot and IMO these are the fundamental important
information for
I love these documentation lines in the D docs:
auto byGrapheme(Range)(Range range)
How should I know what auto is? Why not write the explicit type so that
I know what to expect? When declaring a variable as class/struct member
I can't use auto but need the explicit type...
I used
I have:
Grapheme[] gr;
dchar[1] buf;
encode(buf, cast(dchar)myData);
gr =~ decodeGrapheme(buf[]);
Which gives:
Error: template std.uni.decodeGrapheme cannot deduce function from
argument types !()(dchar[]), candidates are:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\uni.d(7164,10):
On 2019-12-31 21:36:56 +, Steven Schveighoffer said:
The fact that a Grapheme's return requires you keep the grapheme in
scope for operations seems completely incorrect and dangerous IMO (note
that operators are going to always have a ref this, even when called on
an rvalue). So even
On 2020-01-05 04:18:34 +, H. S. Teoh said:
At a minimum, I think we should file a bug report to investigate whether
Grapheme.opSlice can be implemented differently, such that we avoid this
obscure referential behaviour that makes it hard to work with in complex
code. I'm not sure if this is
I read all the docs but I'm not toally sure. Is it that [x][y] is a 2D
array-index, where as [x,y] is a slice?
But the example in docs for opIndexAssign uses the [x,y] syntax, which
is confusing:
```
struct A
{
int opIndexAssign(int value, size_t i1, size_t i2);
}
void test()
{
A a;
On 2020-01-07 17:42:48 +, Adam D. Ruppe said:
So [x][y] indexes an array of arrays.
Yes, that's what I understand. And both can be dynamic, so that I can
have a "flattering" layout where not all arrays have the same length.
[x,y] indexes a single array that has two dimensions.
Does
On 2019-12-22 18:45:52 +, Steven Schveighoffer said:
switch to using char[]. Unfortunately, there's a lot of code out there
that accepts string instead of const(char)[], which is more usable. I
think many people don't realize the purpose of the string type. It's
meant to be something that
On 2019-12-23 15:05:20 +, H. S. Teoh said:
On Sun, Dec 22, 2019 at 06:27:03PM +0100, Robert M. Münch via
Digitalmars-d-learn wrote:
Want to add I'm talking about unicode strings.
Wouldn't it make sense to handle everything as UTF-32 so that
iteration is simple because code-point = code
On 2020-01-07 19:06:09 +, H. S. Teoh said:
It's up to you how to implement all of this, of course. The language
itself doesn't ship a built-in type that implements this, but it does
provide the scaffolding for you to build a custom multi-dimensional
array type.
Hi, thanks for your
On 2020-03-07 12:10:27 +, Jonathan M Davis said:
I take it that you're asking why you don't get the time zone as part of the
string when you call one of the to*String functions?
The problem is, the from* functions give an error, that this is not an
ISO date.
I get this in an XML
It looks like std.datetime is not anticipating the +1:00 part of a date
like: "2018-11-06T16:52:03+01:00"
Those dates are used all over on the internet and I'mm wondering why
it's not supported. Any reason? Is this +01:00 not ISO conforming?
--
Robert M. Münch
http://www.saphirion.com
On 2020-03-07 16:41:47 +, MoonlightSentinel said:
You can use an anonymous lambda to build the string in CTFE:
--
struct S {
int a;
bool b;
}
import std;
enum string sql = {
string s = "CREATE TABLE data(";
static foreach(f;
On 2020-03-07 16:41:47 +, MoonlightSentinel said:
On Saturday, 7 March 2020 at 16:30:59 UTC, Robert M. Münch wrote:
Is this possible at all?
You can use an anonymous lambda to build the string in CTFE:
--
struct S {
int a;
bool b;
}
I want to create a "CREATE TABLE data (...)" where the columns are
derived from struct member names. Something like:
string s = "CREATE TABLE data(";
static foreach(f; FieldNameTuple!myStruct) {
s ~= f ~ ",";
}
s ~= ");";
Which of course doesn't work... I didn't find any reference how to
I use a C libary and created D imports with dstep. It translates the C
structs to D structs.
When I now use them, everything compiles fine but I get an unresolved
external error:
WindowsApp1.obj : error LNK2019: unresolved external symbol
"myCstruct.__init" (_D7myCStruct6__initZ) referenced
On 2020-04-14 18:23:05 +, Steven Schveighoffer said:
On 4/14/20 1:51 PM, Robert M. Münch wrote:
I use a C libary and created D imports with dstep. It translates the C
structs to D structs.
When I now use them, everything compiles fine but I get an unresolved
external error:
Wouldn't it make a lot of sense to allow different opIndex
implementations based on return type?
class myC {
myT1 opIndex(int x)
myT2 opIndex(int x)
}
Depending on the types involved myC[1] woudl return myT1 or myT2.
Use-case: I have a geomentry object and in one case I get
On 2020-04-14 18:44:55 +, Steven Schveighoffer said:
On 4/14/20 2:29 PM, Robert M. Münch wrote:
Ah, ok. That's why the problem went (temporarly) away when I did a:
myCstruct a = {0,0}; for example?
I don't know what causes it to be emitted when. Sometimes it doesn't
make a whole lot of
On 2020-04-17 09:06:44 +, Dominikus Dittes Scherkl said:
On Friday, 17 April 2020 at 08:59:41 UTC, Robert M. Münch wrote:
How would that look like?
myStruct ms = void; // ???
Exactly.
Cool... never saw this / thought about it... will remember it, hopefully.
--
Robert M. Münch
On 2020-04-16 18:33:51 +, Basile B. said:
On Tuesday, 14 April 2020 at 17:51:58 UTC, Robert M. Münch wrote:
I use a C libary and created D imports with dstep. It translates the C
structs to D structs.
When I now use them, everything compiles fine but I get an unresolved
external error:
On 2020-04-15 15:18:43 +, Steven Schveighoffer said:
The difference is you are telling the compiler that it should generate
any symbols for those types. If you just import them, then it's
expecting something else to build those symbols.
Maybe I'm a bit confused, but that's quite
On 2020-04-04 10:32:32 +, Ferhat Kurtulmuş said:
Probably I didn't understand what you mean. Sorry if this is not the
case, but this one is easy.
...
struct S {
float a;
float b;
S opOpAssign(string op)(ref S rhs) if (op == "+"){
this.a += rhs.a;
this.b +=
On 2020-04-04 10:32:32 +, Ferhat Kurtulmuş said:
struct S {
float a;
float b;
S opOpAssign(string op)(ref S rhs) if (op == "+"){
this.a += rhs.a;
this.b += rhs.b;
return this;
}
}
If the struct is from some 3rd party source, how can I add
D doesn't have implicit operators for structs?
struct S {float a, float b};
S a = {1, 5};
S b = {2, 5);
a += b;
Error: a is not a scalar, it is a S
So I really have to write an overloaded operator for such cases?
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
I need to dynamically initialize a fixed number of entries of the form:
(start, length) and iterate over them.
Hence, I think a struct makes sense:
struct S {
s1, l1
, s2, l2
, s3, l3
}
Now I need to initialize the values like this:
S myS = {s1:0, l1:10, s2:(2*s1), ...};
So I somehow
For ressource management I mostly use this pattern, to ensure the
destructor is run:
void myfunc(){
MyClass X = new MyClass(); scope(exit) X.destroy;
}
I somewhere read, this would work too:
void myfunc(){
auto MyClass X = new MyClass();
}
What does this "auto" does here? Wouldn't
void
On 2020-04-30 17:04:43 +, Ben Jones said:
I think you want to use scope rather than auto which will put the class
on the stack and call its destructor:
https://dlang.org/spec/attribute.html#scope
Yes, thanks.
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
On 2020-04-30 17:45:24 +, Steven Schveighoffer said:
No, auto is declaring that there's about to be a variable here. In
actuality, auto does nothing in the first case, it just means local
variable. But without the type name, the type is inferred (i.e. your
second example). This does not
On 2020-05-02 18:18:44 +, Steven Schveighoffer said:
On 5/2/20 4:44 AM, Robert M. Münch wrote:
How would that help, because the class instance is now unusable anyway.
So I have it around like a zombie and others might think: "Hey you look
normal, let's get in contact" and then you are
This works:
countUntil!(std.uni.isWhite)("hello world"))
How can I switch this to (not working);
countUntil!(!std.uni.isWhite)("hello world"))
without having to write my own predicate?
Or is there an even better way to search for all "drawable unicode characters"?
--
Robert
On 2020-05-03 21:59:54 +, Harry Gillanders said:
I'm unsure as to which part is unclear,
Well, I was trapped by this formatting/syntax:
size_t drawableCharacterCount (CodePoints) (auto ref CodePoints
codePoints)
if (isInputRange!CodePoints && is(ElementType!CodePoints :
Let's assume I have an GUI application and I want to record some
user-actions which can be replayed.
And this replay should be possible even if the application layout
changes. Hence, I somehow need to identify the run-time objects in a
way that this identification stays the same while the app
On 2020-03-07 16:40:15 +, Adam D. Ruppe said:
Use regular foreach with a regular string. Put that inside a function.
Then simply use that function to initialize your other thing and enjoy
the magic of CTFE!
Perfect! This implicit CTFE is a tricky thing to see/remember/...
Feeling a bit
On 2020-05-02 20:43:16 +, Steven Schveighoffer said:
destroy sets all the values to the .init value. And it nulls the vtable
pointer.
Ok, that makes sense. Thanks for all the deep internal details. There
is always a lot to learn.
--
Robert M. Münch
http://www.saphirion.com
smarter |
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