I have web-application project in D language hosted on
bitbucket.org. So I using Mercurial repository. I exactly have
two *logical* projects but currently they are in one repo. The
first is my library that includes not only D code, but also some
resources like HTML-page templates (not compiled
Also I have additional question to this post.
6. If I would convert my repo to git, but use anather hosting
that github.org for example my own local server or bitbucket.org.
How could I specify source for loading dependencies? This is
unclear from dub documentation. Is it a tool for working
Thanks for all the answers)
8. I have another more simple question about rdmd utility. It
takes one *.d file and searches for all dependencies. What if I
need to pass independent *.d file or *.ddoc file directly to dmd
compiler? How could I do that using dmd? I have no idea how I
could
I have the following programme
import std.stdio;
bool isDigit(char c) nothrow
{
return c = '0' c = '9';
}
ushort hexValue(char c) nothrow
{
if( isDigit(c) )
return c - '0';
else if (c = 'a' c = 'f')
return c - 'a' + 10;
else if
ushort hexValue(in char c) pure nothrow @safe @nogc
else
return ushort.max;
I understand what pure, nothrow and @safe mean there. But what
@nogc changes in there so I should use this modifier? Is it
logical specifier that this function can be used without garbage
In expression
return c - 'a' + 10;
I could think that 10 has type int and resulting value promoted
to the largest type. But I don't understand why in expression
where both of arguments have type char:
return c - '0';
I have resulting type int. It's very strange for me and looks
In D operations among chars return a int. The same happens in
C/C++.
If you subtract a char from a char in general you can have a
negative result, that can't fit in a char. So what's buggy is
your thinking.
Ok. Thank you! I never thought about it that way
Another stupid question. Using this logic substraction for two
uint values should return int too, because it can produce
negative result. Am I right or not?
On Sunday, 22 June 2014 at 11:57:48 UTC, Uranuz wrote:
Another stupid question. Using this logic substraction for two
uint values should return int too, because it can produce
negative result. Am I right or not?
Now this code
import std.stdio;
void main()
{
uint a = 50;
uint
If these rules are not so clear and have some exceptions (but I
don't understand why they are needed) then some documentation
needed about this. But I would prefer to have result of uint
substraction like uint, and char substraction like char. If we
will changing all the types it will be kind
I'm trying to declare format for database record in compile time.
I consider to use attributes fo this. Can I do something similar
to this code?
struct RecordFormat(T)
{}
alias Format = RecordFormat!( @(cool) int );
pragma( msg, Format );
void main()
{
}
Or I want something strange
But if I write
@(hello) struct Hello {}
so all of the variables that have type Hello will have attribute
@(hello) like come type qualifier because attribute is a part
of declaration of Hello. Do I understand correctly?
Compiler can't deduce type for template struct Pair when using it
with enum argument. There is an example
import std.stdio;
enum Category { first, second, third };
struct Pair(F, S)
{
F first;
S second;
this(F f, S s)
{
first = f;
On Friday, 27 June 2014 at 06:14:48 UTC, pgtkda wrote:
On Friday, 27 June 2014 at 06:12:57 UTC, pgtkda wrote:
How I could make this
working without explicit specifying of types?
sorry, i should read better
Ok. Maybe it was discussed already somewhere, but I am not god in
searching in
I think, D is a typesafe language, therefore you can't use
variables with no type declaration.
One thing you can search for, are templates but even there you
have to define a type:
import std.stdio;
enum Category : string { first = first}
template Pair(T)
{
T t;
T cat;
}
Seems that I found answer myself. As far as I understand type
inference is working only for template functions but not struct
or class templates. This is why this not working and enum is not
responsible for that.
I don't know why I use D enough long but I did not remember this
fact.
There is proposal exists for this topic
http://wiki.dlang.org/DIP40
I have a question about this example code;
import std.stdio;
string getByName(string name)
{
return smth;
}
template getByName(string name)
{
enum
//string
getByName = getByName(name);
}
void main()
{
writeln(getByName!(name));
}
This produces
import std.stdio;
string getByName(string name)
{
return smth;
}
template getByName(string name)
{
enum getByName = .getByName(name);
}
void main()
{
writeln(getByName!(name));
}
Thanks a lot! Very interesting. Do you see any reasoning why this
happens?
I have a question. How could I know if some alias or template
parameter is some template symbol. I want to not that I want to
know that symbol is template symbol itself but not instance of
template (std.traits.isInstanceOf give answer for that question).
I'll give some example
template
I suddenly posted it for somehow. But I hope idea is clear. How
could I test if symbol is equal to some concrete template. I
tried these examples:
template isFoo(alias F)
{
enum bool isFoo = is( F == Foo );
}
template isFoo(alias F)
{
enum bool isFoo = F == Foo;
}
Could you advise
On Tuesday, 1 July 2014 at 05:51:17 UTC, Peter Alexander wrote:
template Foo(T...) {}
template Bar(T...) {}
template isFoo(alias F)
{
enum isFoo = __traits(isSame, F, Foo);
}
pragma(msg, isFoo!Foo); // true
pragma(msg, isFoo!Bar); // false
Thanks for quick response. I really forget
I have another question about testing if given symbol is instance
of the given template and geting it's template arguments. I'm
talking about raw template symbols, but not struct or class
templates. For case with struct or class template
std.traits.isInstanceOf is working well. But using *raw*
Suddenly posted. I don't know why it's happened))
template isMyInstanceOf(alias Templ, alias Inst)
{
alias Args = ???; //I don't have idea how to get it
enum bool isMyInstanceOf = __traits(isSame, Templ!(Args),
Inst);
}
Do you have any idea how to solve this? May be standad library
template isMyInstanceOf(alias Templ, alias Inst)
{
alias Args = ???; //I don't have idea how to get it
enum bool isMyInstanceOf = __traits(isSame, Templ!(Args),
Inst);
}
Do you have any idea how to solve this? May be standad library
could be improved with such type of test for
The question is in the header:
How to say to compiler that I want to inherit final template
bethod of base interface into derived class?
I have the following example. I know that it is maybe
overcomplicated but still I need this feature in my code.
import std.stdio;
interface IBase
{
On Sunday, 20 July 2014 at 12:48:09 UTC, anonymous wrote:
import std.stdio;
interface IBase
{
template getStr(string fieldName)
{
final string getStr()
{
return George;
}
}
On Sunday, 20 July 2014 at 16:12:20 UTC, anonymous wrote:
On Sunday, 20 July 2014 at 15:48:19 UTC, Uranuz wrote:
Sorry, but this example doesn't work too.
Ugh, 2.065 doesn't like it, but it works for me with git head
(v2.066-devel-82b031c).
Where did you get it? Or you compiled it yourself?
On Monday, 23 June 2014 at 18:32:38 UTC, Steven Schveighoffer
wrote:
On Sun, 22 Jun 2014 08:23:45 -0400, Uranuz neura...@gmail.com
wrote:
If these rules are not so clear and have some exceptions (but
I don't understand why they are needed) then some
documentation needed about this.
See
In C/C++/D if you sum a types that are smaller than int, you
obtain an int. D has copied C for backwards compatibility with
C code.
Bye,
bearophile
Is there any reasoning why this should remain unchainged? How
could it break interface between languages? And also this code
succesfully
I see these rules but when I compile following code and it
fails with error it looks VERY stupid.
import std.stdio;
void main()
{
ubyte a = 15;
ubyte b = 10;
ubyte c = a + b; //What is happening there?! ARGH! Are you
joking?!
}
Compilation output:
I want to try to implement web template engine dustjs:
http://akdubya.github.io/dustjs/
At the first step implementing parser for it's grammar is needed.
As far as code for parsing grammar was generated via PEGjs
grammar generator the resulting code is enough long (about 4200
lines of code).
I am real noob about grammar description languages so I need some
explanation about it. As far as I understand expressions in curly
bracers are used to modify syntax tree just in process of parsing
instead of modifying it after?
How I could use PEGGED to map some code to these parsed
Different formats and also different languages. I don't see how
you
can compare a parse tree that's a D object and another tree
made by
dustjs: you never see the AST produced by dust, you only see the
resulting JS code.
Yes. That's a point. Thanks for all the explanations. I'll try to
make
On Tuesday, 5 August 2014 at 08:13:25 UTC, Uranuz wrote:
Different formats and also different languages. I don't see
how you
can compare a parse tree that's a D object and another tree
made by
dustjs: you never see the AST produced by dust, you only see
the
resulting JS code.
Yes. That's a
What I was thinking about is possibility to change ParseTree
struct with user-defined version of it. And I was thinking about
setting tree type as template parameter to grammar:
grammar!(MyParseTree)(
Arithmetic:
...
);
Or somethink like this. I think changing source code of library
in
I think there is something that I don't understand about concept
of *properties*. I thing that property is sort of object
attribute that belongs to it. Currently property considered as
two functions: *get* and/or *set*. So we can do two sort of
operations on concept that called *property*:
On Monday, 18 August 2014 at 18:07:09 UTC, Phil Lavoie wrote:
All you said makes sense. If there is a direct connection
between getter, setter and member than yes, returning it by
reference is usually more convenient:
private T _member;
@property ref inout(T) member() inout {return _member;}
I posted it suddenly. I don't know why.
I'll give short illustration.
struct PropType
{
void append(int value)
{
//implementation
}
}
class Test
{
PropType myProp() @property
{
return _propValue;
}
private PropType _propValue;
}
void main()
{
Test test
I have another similar example illustrating this problem at
semantic level.
import std.stdio, std.typecons;
struct Test
{
//ref
Nullable!int prop() @property
{
return _value;
}
private Nullable!int _value = 10;
}
void
On Thursday, 28 August 2014 at 10:16:15 UTC, Puming wrote:
I updated dub to 0.9.22 and still got the same error...
THis is the output of `dub build --force`:
--- output ---
## Warning for package sdlang-d ##
The following compiler flags have been specified in the package
description
file.
I have struct StringStream that I use to go through and parse
input string. String could be of string, wstring or dstring type.
I implement function popChar that reads codeUnit from Stream. I
want to have *debug* mode of parser (via CT switch), where I
could get information about lineIndex,
You can use std.uni.byGrapheme to iterate by graphemes:
http://dlang.org/phobos/std_uni.html#.byGrapheme
AFAIK, graphemes are not self synchronizing, but codepoints
are. You can pop code units until you reach the beginning of a
new codepoint. From there, you can iterate by graphemes, though
Have a look here [1]. For example, if you have a byte that is
between U+0080 and U+07FF you know that you need two bytes to
get that whole code point.
[1] http://en.wikipedia.org/wiki/UTF-8#Description
Thanks. I solved it myself already for UTF-8 encoding. There
choosed approach with
I have some string *str* of unicode characters. The question is
how to check if I have valid unicode code point starting at code
unit *index*?
I need it because I try to write parser that operates on string
by *code unit*. If more precisely I trying to write function
*matchWord* that should
This is
I haven't touched any key on a keyboard and haven't pressed
*Send* but message was posted somehow.
Thanks. Checking for UTF-8 continuation bytes is good idea. Also
I agree that UTF-16 is more difficult. I will keep it for future
release when implementation will start to work properly on UTF-8
Now I'm working on implementation of Jinja template engine for
web development on D language.
http://jinja.pocoo.org
I like it's explicit but still rather short syntax inherited from
Python. I find it good for writing templates for web pages and
other stuff such as configs or maybe CSS
I have an example of code like this:
template Node(String)
{
struct Node {}
struct Name {}
struct Attr {}
}
void main()
{
alias MyNode = Node!(string).Node;
alias MyName = Node!(string).Name;
alias MyAttr = Node!(string).Attr;
}
Looks like compiler looks for Node, Name and Attr in Node
struct, because of eponymous thing.
I understand it but I want to know if it is documented behaviour
or not. Could anybody clear what happens with eponymous stuff and
why I can't get acces to *other* declarations inside eponymous
I think it's the intended behavior. I think documentation is
outdated.
Ali
Thanks. So I will modify my programme to workaround this.
Also I failed to find any documentation about eponymous stuff in
language reference. As far as I remember it was here but now
looks like it is missing.
In D we a several data types which are passed by reference:
dynamic arrays, associative arrays. And sometimes we need to pass
these reference data to class instance to store it inside. One of
the principles of object-oriented programming is incapsulation.
So all class data should be only
On Friday, 28 November 2014 at 08:31:26 UTC, bearophile wrote:
Uranuz:
Same situation happens when I assign reference data to
properties.
Someone has suggested to solve this problem with an attribute,
like owned, that forbids to return mutable reference data
owned by a class/struct
On Wednesday, 2 September 2015 at 07:34:15 UTC, Mike Parker wrote:
On Wednesday, 2 September 2015 at 06:28:52 UTC, Uranuz wrote:
As far as I understand to save current cursor of forward range
I should always use *save* property. But sometimes range
struct is just copied using postblit without
As far as I understand to save current cursor of forward range I
should always use *save* property. But sometimes range struct is
just copied using postblit without using save (it happens even in
Phobos). Is it correct behaviour to *pass ownership* for range
structs via just copying of range
Hello to forum readers!
I have a question about using OutputRange and std.range: put. I
have the following code snippet to illustrate my question:
import std.range, std.stdio, std.string;
void main()
{
string greating = "Hello, " ;
string username = "Bob";
On Saturday, 16 January 2016 at 16:14:56 UTC, Jonathan M Davis
wrote:
On Saturday, January 16, 2016 12:11:11 Uranuz via
Digitalmars-d-learn wrote:
[...]
There are a few problems here. First off, when put is used with
an array, it fills the array. It doesn't append to it. So, you
can't use
In my custom multithreaded web-server (non vibe-based) I got
error that is strange for me. I've was looking for a reason
running app under GDB, but I don't understand how to interpret
what I've got.
It's interesting that it fails (without any error or segfault
message) in the case when null
On Friday, 5 February 2016 at 17:39:55 UTC, Uranuz wrote:
In my custom multithreaded web-server (non vibe-based) I got
error that is strange for me. I've was looking for a reason
running app under GDB, but I don't understand how to interpret
what I've got.
It's interesting that it fails
I am stupid today :) So I have a question. The piece of code
given:
http://dpaste.dzfl.pl/523781df67ab
It looks good, but I don't understand why it works?
On Saturday, 9 April 2016 at 16:44:06 UTC, ag0aep6g wrote:
On 09.04.2016 18:13, Uranuz wrote:
http://dpaste.dzfl.pl/523781df67ab
For reference, the code:
import std.stdio;
void main()
{
string[][string] mapka;
string[]* mapElem = "item" in mapka; //Checking if I
On Saturday, 9 April 2016 at 21:16:08 UTC, ag0aep6g wrote:
On Saturday, 9 April 2016 at 19:31:31 UTC, Uranuz wrote:
I think that we need to add warning about such case in
documentation section:
https://dlang.org/spec/hash-map.html#construction_and_ref_semantic
in order to prevent this kind of
On Saturday, 9 April 2016 at 18:27:11 UTC, ag0aep6g wrote:
On Saturday, 9 April 2016 at 18:06:52 UTC, Uranuz wrote:
Thanks. It's clear now. AA holds not `array struct` itself
inside, but pointer to it.
How the array is stored in the AA doesn't matter, as far as I
can see. The point is that
On Saturday, 9 April 2016 at 19:25:32 UTC, Uranuz wrote:
On Saturday, 9 April 2016 at 18:27:11 UTC, ag0aep6g wrote:
[...]
Another observation is illustrated with the foloving code:
http://dpaste.dzfl.pl/8d68fd5922b7
Because AA and arrays are not created before they were assigned
some value
In my program I have error with circular imports of modules with
static ctors. So I decided to move ctors in separate file and
import it only from the 1st file. But problem is that in the
first file I have immutables that should be initialized in shared
static ctor. However doing it from
Greatings!
I need help with these lines bellow. I don't understand why it
doesn't compile. Is it bug somewhere in Phobos or compiler? Or
just I wrote smth wrong?
//-
struct A
{
import std.algorithm: map;
import std.array: array;
import std.typecons: tuple;
On Sunday, 14 August 2016 at 15:53:21 UTC, ag0aep6g wrote:
On 08/14/2016 04:27 PM, Uranuz wrote:
[...]
Looks like a compiler bug, since it works without the struct:
import std.algorithm: map;
import std.array: array;
import std.typecons: tuple;
immutable aaa = [
tuple("1",
On Tuesday, 13 September 2016 at 15:32:57 UTC, Jonathan M Davis
wrote:
On Tuesday, September 13, 2016 08:28:10 Jonathan M Davis via
Digitalmars-d- learn wrote:
On Tuesday, September 13, 2016 04:58:38 Uranuz via
Digitalmars-d-learn
wrote:
> In my code I iterate in CT over class methods mar
In my code I iterate in CT over class methods marked as @property
and I have a probleme that one of methods is @disable. So I just
want to skip @disable members. I found possible solution, but
it's interesting to we if we have more clear and obvious way to
test for @disable without using
On Saturday, 1 October 2016 at 18:33:02 UTC, TheFlyingFiddle
wrote:
On Saturday, 1 October 2016 at 16:45:11 UTC, Uranuz wrote:
[...]
There are two reasons why this does not compile. The first has
to do with how retro() (and indeed most function in std.range)
work with utf-8 strings (eg the
On Saturday, 1 October 2016 at 18:55:54 UTC, pineapple wrote:
On Saturday, 1 October 2016 at 17:55:08 UTC, Uranuz wrote:
On Saturday, 1 October 2016 at 17:32:59 UTC, Uranuz wrote:
On Saturday, 1 October 2016 at 17:23:16 UTC, Uranuz wrote:
[...]
But these example fails. Oops. Looks like a
On Saturday, 1 October 2016 at 17:32:59 UTC, Uranuz wrote:
On Saturday, 1 October 2016 at 17:23:16 UTC, Uranuz wrote:
[...]
But these example fails. Oops. Looks like a bug(
import std.stdio;
import std.algorithm;
import std.range;
import std.string;
[...]
I created bug report on this:
How to make rsplit (like in Python) in D without need for extra
allocation using standard library? And why there is no algorithms
(or parameter in existing algorithms) to process range from the
back. Is `back` and `popBack` somehow worse than `front` and
`popFront`.
I've tried to write
On Saturday, 1 October 2016 at 16:45:11 UTC, Uranuz wrote:
How to make rsplit (like in Python) in D without need for extra
allocation using standard library? And why there is no
algorithms (or parameter in existing algorithms) to process
range from the back. Is `back` and `popBack` somehow
On Saturday, 1 October 2016 at 17:23:16 UTC, Uranuz wrote:
On Saturday, 1 October 2016 at 16:45:11 UTC, Uranuz wrote:
How to make rsplit (like in Python) in D without need for
extra allocation using standard library? And why there is no
algorithms (or parameter in existing algorithms) to
I have read it two or three times just before writing my question:
https://dlang.org/spec/declaration.html#alias
And also a have read all the dlang docs several time few years
ago... ;)
But I don't see what do you you mean by writing that it was
menioned here. I don't se any words or any
Is it also possible to set some custom thread name for GC threads
in order to be distinguishable from other threads in utilities
like `htop`? It would be handy...
I apologise that I need to revive this discussion again. But
still I got answer to only one of my questions. I know that it is
a common practice in programmers society that when someone asks
more than 1 question. Then people who answer them usually choose
only one of these questions that is
Hello! I have a question about `alias` template parameter and
getOverloads.
For instance I have some code like this:
// -
import std;
import core.thread;
void foo(string param1) {}
void foo(string param1, int param2) {}
template Bar(alias Func)
{
// Next line is not valid now. This is
Thanks for advice ;) This looks like some `standard trick` that
is yet not learnt or forgoten by me personally. The key was in
using `parent` trait. This is what I failed to think of. This is
working as expected:
//-
import std;
import core.thread;
import std.meta: AliasSeq;
void
OK. Thanks. Created two reports related to these questions:
https://issues.dlang.org/show_bug.cgi?id=20553
https://issues.dlang.org/show_bug.cgi?id=20555
> Either way, generic code should never be using a range after
> it's been copied, and copying is a key part of how
> idiomatic, range-based code works in D.
OK. Thanks for instructions. I shall give it a try.
Actually, as I understand it, the main reason that save was
introduced was so that classes could be forward ranges
I have use of ranges as a classes in my code that rely on classes
and polymorthism, but it's usually an InputRange that implements
Phobos interface:
It's very bad. Because there seem that when I use range based
algorithm I need to take two things into account. The first is
how algrorithm is implemented. If it creates copies of range
inside or pass it by reference. And the second is how the range
is implemented if it has value or reference
On Sunday, 16 February 2020 at 12:38:51 UTC, Jonathan M Davis
wrote:
On Sunday, February 16, 2020 3:41:31 AM MST uranuz via
Digitalmars-d-learn wrote:
I have reread presentation:
http://dconf.org/2015/talks/davis.pdf
We declare that `pure` input range cannot be `unpoped` and we
can't return
Also I see the problemme that someone can think that it creates
an input range, because he doesn't provide `save` method, but
actually it creates forward range unexpectedly, because it is
copyable. And it makes what is actually happening in code more
difficult. Some algrorithm can take ranges
In general for value-semantics and ref-semantics the different
code is actually needed. But generic algorithm try to pretend
that the logic is the same. But it's not true. But in wide subset
of trivial algorithm it's true. So it's incorrectly interpolated
that it's true for every case. The
I have reread presentation:
http://dconf.org/2015/talks/davis.pdf
We declare that `pure` input range cannot be `unpoped` and we
can't return to the previous position of it later at the time. So
logically there is no sence of copying input range at all. So
every Phobos algorithm that declares
I am interested in current circumstances when we have new copy
constructor feature what is the purpose of having range `save`
primitive? For me they look like doing basicaly the same thing.
And when looking in some source code of `range` module the most
common thing that `save` does is that it
I have created library/ framework to handle JSON-RPC requests
using D methods. I use some *template magic* to translate
JSON-RPC parameters and return values from/ and to JSON. And I
have encountered funny bug that at first was hard to find. My
programme just segfaulted when call to this
On Monday, 30 December 2019 at 19:09:13 UTC, MoonlightSentinel
wrote:
On Monday, 30 December 2019 at 18:18:49 UTC, uranuz wrote:
So as you see I have added a lot of enforce to test if all
variables are not null. But nothing was null and the reason of
segfault were unclear.
What about
On Monday, 30 December 2019 at 19:09:13 UTC, MoonlightSentinel
wrote:
On Monday, 30 December 2019 at 18:18:49 UTC, uranuz wrote:
So as you see I have added a lot of enforce to test if all
variables are not null. But nothing was null and the reason of
segfault were unclear.
What about
The question is why Throwable.message is not a @property?! It
looks strange now, because "message" is not a *verb*, but a
*noun*. So it's expected to be a property. Also because it is not
a property in some contexts when I try to concatenate it with
string without parentheses using "~"
On Wednesday, 17 March 2021 at 17:52:20 UTC, Adam D. Ruppe wrote:
On Wednesday, 17 March 2021 at 17:46:27 UTC, uranuz wrote:
Also because it is not a property in some contexts when I try
to concatenate it with string without parentheses using "~"
operator it fails
Can you post some sample
On Wednesday, 17 March 2021 at 19:38:48 UTC, Adam D. Ruppe wrote:
On Wednesday, 17 March 2021 at 19:32:02 UTC, uranuz wrote:
Seems that a problem with concatenation is because
Throwable.message has const(char)[] type, but not string. This
makes some inconvenience ;-)
Yes, that's what I
Hello!
I have some strange problem. I am trying to parse XML files and
extract some information from it.
I use library dxml for it by Jonathan M Davis. But I have a
probleme that I have multiple XML files made by different people
around the world. Some of these files was created with Byte
Addition:
Current solution to this problemme that I was found is:
So I just check for BOM manually. Get length of bom.sequence and
remove that count of items from beginning. But I dont' think that
it's convenient solution, because `who knows` how much else
issues with UTF could happend. And I
OK. Thanks for response. I wish that there it was some API to
handle it "out of the box". Do I need to write some issue or
something in order to not forget about this?
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