Re: Ini parsing library in D ?
On 2011-02-28 08:04, Tarun Ramakrishna wrote: Hi, Do we have a ini parser in D somewhere ? If not, is there some documentation anywhere that tells one how to wrap a simple C++ library like simple ini ? (Of course it isn't difficult to build a quick parser, just that someone would done this already) Thanks, Tarun There is one in Tango, tango.io.stream.Map. -- /Jacob Carlborg
Re: Ini parsing library in D ?
http://www.dprogramming.com/ini.php
Re: Version very simple?
Note that negation and logical and can basically be simulated:
!bla ->
version(bla) {} else ...
bla && blub ->
version(bla) version(blub) {...}
Re: Initializing a class pointer
On 2/27/2011 10:39 PM, Steven Schveighoffer wrote:
On Sat, 26 Feb 2011 19:46:18 -0500, Tyro[a.c.edwards]
wrote:
On 2/27/2011 8:52 AM, Simen kjaeraas wrote:
Tyro[a.c.edwards] wrote:
I'm trying to convert some c++ code that defines
T func(par...)
{
Controller * pCtrl = WinGetLong (hwnd);
.
.
.
switch(msg)
{
case FirstMatch:
pCtrl = new Controller (hwnd, reinterpret_cast
(lParam));
break;
}
}
I'm not sure why I need a pointer to the class, just trying to figure
it out.
Ah. You would not need a pointer to the class in D. Instead, your
function
would look something like this:
T funct(par...)
{
auto pCtrl = WinGetLong!Controller(hwnd);
...
switch(msg)
{
case FirstMatch:
pCtrl = new Controller(hWnd, cast(CREATESTRUCT*)lParam);
break;
}
}
C++ classes are in some ways more akin to D structs, in that:
class A {};
void foo(){
A bar;
}
bar would be allocated on the stack in C++, while in D bar would be a
pointer to a class instance on the heap. (well, it would be null, but
when you set it to something, that something would reside on the heap)
Ok, that's essentially what I have, except that I used Controller
pCtrl vice auto. WinGetLong however, is a template that calls
GetWindowLongPtrA() and casts it's result (in this case) to
Controller. GetWindowLongPtrA() returns LONG_PTR (aka int) and
therefore fails miserably on the cast attempt. On the reverse, there
is a WinSetLong that attempts to cast Controller to int for use with
SetWindowLongPtrA(). Neither of these functions complain when I use
Controller* but I end up with the problem of trying to initialize a
pointer with a reference to Controller.
You almost certainly do not want a pointer to a class reference. A class
typically resides on the heap, but the reference typically does not.
Therefore, by using a pointer to a class reference, you run very high
risk of escaping stack data, leading to memory corruption.
Looking at the documentation for GetWindowLongPtr, it appears to get
data associated with a window. Likely, this information is the a pointer
to the Controller class.
I would recommend doing this:
T WinGetLong(T)(HWND hwnd)
{
return cast(T)cast(void*)GetWindowLongPtrA(hwnd, ...);
}
and
void WinSetLong(T)(HWND hwnd, T t)
{
SetWindowLongPtrA(hwnd, ..., cast(LONG_PTR)cast(void*)t);
}
where the ... is the index copied from the C++ code (guessing it's
GWLP_USERDATA?).
btw, reinterpret_cast(x) is equivalent to (T)(void *)x;
-Steve
Thank you all (Steve, Bekenn, and Simen) for your assistance on this.
Re: How do you test pre-/post-conditions and invariants?
On 2011-02-27 02:33:46 +0100, Jonathan M Davis said: [snip lots of useful stuff] Thanks for your patience, and more useful clarifications. I think I get it now (but I may very well be wrong ;) - M -- Magnus Lie Hetland http://hetland.org
string vs. w/char*
The bellow code attempts to use LoadStringA() to initialize _buf.
However, regardless of what form _buf takes, the body of the if
statement is always executed. I've attempted to use every type of string
available in D to include char* _buf[MAX_RESSTRING+1] and setting
_buf[MAX_RESSTRING] = '\0'; What am I doing incorrectly?
Any assistance is greatly appreciated.
class ResString
{
enum { MAX_RESSTRING = 255 }
alias getBuffer this;
@property string getBuffer() { return _buf; }
this(HINSTANCE hInst, int resId)
{
_buf.length = MAX_RESSTRING;
SetLastError(0);
if(!LoadStringA(hInst, resId, cast(char*)toStringz(_buf),
_buf.length + 1))
{
throw new WinException("Load String failed");
}
}
private:
string _buf;
}
Re: Ini parsing library in D ?
Hi Trass, Wow! A pure, plain simple D module for ini parsing. Nice :)) Thanks! Tarun On Mon, Feb 28, 2011 at 3:34 PM, Trass3r wrote: > http://www.dprogramming.com/ini.php >
Re: Named Pipes IPC in D for windows and linux ?
On Sun, 27 Feb 2011 13:53:05 -0500, Tarun Ramakrishna wrote: Is there anything in the standard library to do named pipes IPC in both windows and linux ? I am not necessarily looking for a unified API, anything that will allow me to setup named pipes on either OS and read/write on them will do. Any C functions (including system calls) are available. You are free to write your own API, and maybe it will be included in Phobos! -Steve
Re: Ini parsing library in D ?
Err ok, I got excited too soon. That seems to be a D1 module..anyways I am already halfway through writing my D2 Ini parser, so I guess its fine On Mon, Feb 28, 2011 at 6:07 PM, Tarun Ramakrishna wrote: > Hi Trass, > > Wow! A pure, plain simple D module for ini parsing. Nice :)) > > Thanks! > Tarun > > > On Mon, Feb 28, 2011 at 3:34 PM, Trass3r wrote: >> http://www.dprogramming.com/ini.php >> >
Re: string vs. w/char*
On Mon, 28 Feb 2011 07:34:39 -0500, Tyro[a.c.edwards]
wrote:
The bellow code attempts to use LoadStringA() to initialize _buf.
However, regardless of what form _buf takes, the body of the if
statement is always executed. I've attempted to use every type of string
available in D to include char* _buf[MAX_RESSTRING+1] and setting
_buf[MAX_RESSTRING] = '\0'; What am I doing incorrectly?
Any assistance is greatly appreciated.
class ResString
{
enum { MAX_RESSTRING = 255 }
alias getBuffer this;
@property string getBuffer() { return _buf; }
this(HINSTANCE hInst, int resId)
{
_buf.length = MAX_RESSTRING;
SetLastError(0);
if(!LoadStringA(hInst, resId, cast(char*)toStringz(_buf),
_buf.length + 1))
{
throw new WinException("Load String failed");
}
}
private:
string _buf;
}
You should not be overwriting buf, it is immutable. You need to make a
new buffer each time.
this(HINSTANCE hInst, int resId)
{
auto mybuf = new char[MAX_RESSTRING];
auto nchars = LoadStringA(hInst, resId, mybuf.ptr, mybuf.length);
if(!nchars)
{
throw new WinException("Load String failed");
}
_buf = assumeUnique(mybuf[0..nchars]);
SetLastError(0);
}
If this isn't working, you might consider that the string you are trying
to load doesn't actually exist (that is a valid condition). What is the
error from GetLastError ?
-Steve
Re: Named Pipes IPC in D for windows and linux ?
Hi Steven, Yes, I have now understood that. Is there a guidelines/best practices page somewhere that describes how should a good library be coded for acceptance into the standard library: patterns and conventions, etc ? I am very new to D, but from the mails I have read on this list so far, I have learnt that all the devs here prefer that a library API should preferably take power of D ranges, slices and generics. But what about other things ? Thanks, Tarun On Mon, Feb 28, 2011 at 6:19 PM, Steven Schveighoffer wrote: > On Sun, 27 Feb 2011 13:53:05 -0500, Tarun Ramakrishna > wrote: > >> Is there anything in the standard library to do named pipes IPC in >> both windows and linux ? I am not necessarily looking for a unified >> API, anything that will allow me to setup named pipes on either OS and >> read/write on them will do. > > Any C functions (including system calls) are available. You are free to > write your own API, and maybe it will be included in Phobos! > > -Steve >
type set
Hello,
I have a template condition that looks like this:
T check (T) () if (
is(T == DLogical) ||
is(T == DNumber) ||
is(T == DText) ||
is(T == DList) ||
is(T == DUnit)
) {
...
}
Is there a way to "factor out" such an expression using a kind of type set? If
only for cleaning the code; but also because such a set may get long.
T check (T) () if (is (T in validTypeSet)) {
...
}
Denis
--
_
vita es estrany
spir.wikidot.com
Re: Named Pipes IPC in D for windows and linux ?
On Mon, 28 Feb 2011 08:00:28 -0500, Tarun Ramakrishna wrote: Hi Steven, Yes, I have now understood that. Is there a guidelines/best practices page somewhere that describes how should a good library be coded for acceptance into the standard library: patterns and conventions, etc ? I am very new to D, but from the mails I have read on this list so far, I have learnt that all the devs here prefer that a library API should preferably take power of D ranges, slices and generics. But what about other things ? There is an issue with Windows system calls that is difficult to solve. D uses the DMC runtime, not the MSVC runtime. This means when you call C library functions (e.g. printf, fopen), it uses DMC's C library. The library has very poor support for converting to/from OS handles from things like FILE *. This wouldn't be such a problem, except Phobos' I/O API is based on FILE *. This means any system calls you make (such as CreateNamedPipe) which return a HANDLE will be near impossible to wrap into a FILE *. In writing std.process, I had to write my own converters between FILE * and HANDLE, and when that code is available, you should be able to use it (expect to have it done by the next release of dmd). But for now, I would concentrate on getting it to work for your code. One thing to keep in mind is that any library to be accepted into Phobos *should* be cross-platform if possible. I would think named pipes should be able to be a cross-platform library. -Steve
Re: string vs. w/char*
On 2/28/2011 9:58 PM, Steven Schveighoffer wrote:
On Mon, 28 Feb 2011 07:34:39 -0500, Tyro[a.c.edwards]
wrote:
The bellow code attempts to use LoadStringA() to initialize _buf.
However, regardless of what form _buf takes, the body of the if
statement is always executed. I've attempted to use every type of
string available in D to include char* _buf[MAX_RESSTRING+1] and
setting _buf[MAX_RESSTRING] = '\0'; What am I doing incorrectly?
Any assistance is greatly appreciated.
class ResString
{
enum { MAX_RESSTRING = 255 }
alias getBuffer this;
@property string getBuffer() { return _buf; }
this(HINSTANCE hInst, int resId)
{
_buf.length = MAX_RESSTRING;
SetLastError(0);
if(!LoadStringA(hInst, resId, cast(char*)toStringz(_buf), _buf.length
+ 1))
{
throw new WinException("Load String failed");
}
}
private:
string _buf;
}
You should not be overwriting buf, it is immutable. You need to make a
new buffer each time.
this(HINSTANCE hInst, int resId)
{
auto mybuf = new char[MAX_RESSTRING];
auto nchars = LoadStringA(hInst, resId, mybuf.ptr, mybuf.length);
if(!nchars)
{
throw new WinException("Load String failed");
}
_buf = assumeUnique(mybuf[0..nchars]);
SetLastError(0);
}
If this isn't working, you might consider that the string you are trying
to load doesn't actually exist (that is a valid condition). What is the
error from GetLastError ?
-Steve
Both implementations results in error code 1812 being returned from
GetLastError. explanation of the code reads:
ERROR_RESOURCE_DATA_NOT_FOUND
1812 (0x714)
The specified image file did not contain a resource section.
The code I'm porting initially consisted of a resource.h file, a
generic.rc file and two icons. I have not tried to include the icons and
generic.rc file in the compilation because I do not know how to as yet
and I've only used half of the resource.h file: didn't think I need the
whole thing. Could this be the reason for the error? If so could you
direct me to the explanation of how to prepare these files for inclusion
in the compilation process?
Thanks,
Andrew
Re: type set
On Mon, 28 Feb 2011 08:22:58 -0500, spir wrote:
Hello,
I have a template condition that looks like this:
T check (T) () if (
is(T == DLogical) ||
is(T == DNumber) ||
is(T == DText) ||
is(T == DList) ||
is(T == DUnit)
) {
...
}
Is there a way to "factor out" such an expression using a kind of type
set? If only for cleaning the code; but also because such a set may get
long.
T check (T) () if (is (T in validTypeSet)) {
...
}
This should probably work:
template isOneOf(X, T...)
{
static if(!T.length)
enum bool isOneOf = false;
else static if(is(X == T[0]))
enum bool isOneOf = true;
else
enum bool isOneOf = isOneOf!(X, T[1..$]);
}
T check(T) () if(isOneOf!(T, DLogical, DNumber, DText, TList, DUnit))
{
...
}
Not sure if this exists in std.traits or not, but that's where I'd look.
-Steve
Re: string vs. w/char*
On Mon, 28 Feb 2011 08:30:02 -0500, Tyro[a.c.edwards]
wrote:
On 2/28/2011 9:58 PM, Steven Schveighoffer wrote:
On Mon, 28 Feb 2011 07:34:39 -0500, Tyro[a.c.edwards]
wrote:
The bellow code attempts to use LoadStringA() to initialize _buf.
However, regardless of what form _buf takes, the body of the if
statement is always executed. I've attempted to use every type of
string available in D to include char* _buf[MAX_RESSTRING+1] and
setting _buf[MAX_RESSTRING] = '\0'; What am I doing incorrectly?
Any assistance is greatly appreciated.
class ResString
{
enum { MAX_RESSTRING = 255 }
alias getBuffer this;
@property string getBuffer() { return _buf; }
this(HINSTANCE hInst, int resId)
{
_buf.length = MAX_RESSTRING;
SetLastError(0);
if(!LoadStringA(hInst, resId, cast(char*)toStringz(_buf), _buf.length
+ 1))
{
throw new WinException("Load String failed");
}
}
private:
string _buf;
}
You should not be overwriting buf, it is immutable. You need to make a
new buffer each time.
this(HINSTANCE hInst, int resId)
{
auto mybuf = new char[MAX_RESSTRING];
auto nchars = LoadStringA(hInst, resId, mybuf.ptr, mybuf.length);
if(!nchars)
{
throw new WinException("Load String failed");
}
_buf = assumeUnique(mybuf[0..nchars]);
SetLastError(0);
}
If this isn't working, you might consider that the string you are trying
to load doesn't actually exist (that is a valid condition). What is the
error from GetLastError ?
-Steve
Both implementations results in error code 1812 being returned from
GetLastError. explanation of the code reads:
ERROR_RESOURCE_DATA_NOT_FOUND
1812 (0x714)
The specified image file did not contain a resource section.
The code I'm porting initially consisted of a resource.h file, a
generic.rc file and two icons. I have not tried to include the icons and
generic.rc file in the compilation because I do not know how to as yet
and I've only used half of the resource.h file: didn't think I need the
whole thing. Could this be the reason for the error? If so could you
direct me to the explanation of how to prepare these files for inclusion
in the compilation process?
No clue, sorry. I build D mostly on linux, on windows only when I have
to. Look on digitalmars.com for Windows programming. Or try google.
-Steve
Re: string vs. w/char*
== Quote from Tyro[a.c.edwards] (nos...@home.com)'s article > Both implementations results in error code 1812 being returned from > GetLastError. explanation of the code reads: > ERROR_RESOURCE_DATA_NOT_FOUND > 1812 (0x714) > The specified image file did not contain a resource section. > The code I'm porting initially consisted of a resource.h file, a > generic.rc file and two icons. I have not tried to include the icons and > generic.rc file in the compilation because I do not know how to as yet > and I've only used half of the resource.h file: didn't think I need the > whole thing. Could this be the reason for the error? If so could you > direct me to the explanation of how to prepare these files for inclusion > in the compilation process? > Thanks, > Andrew You need to compile the .rc file (see http://www.digitalmars.com/ctg/rcc.html), then add the resulting .res file to dmd's command line.
Re: type set
On 02/28/2011 02:32 PM, Steven Schveighoffer wrote:
On Mon, 28 Feb 2011 08:22:58 -0500, spir wrote:
Hello,
I have a template condition that looks like this:
T check (T) () if (
is(T == DLogical) ||
is(T == DNumber) ||
is(T == DText) ||
is(T == DList) ||
is(T == DUnit)
) {
...
}
Is there a way to "factor out" such an expression using a kind of type set?
If only for cleaning the code; but also because such a set may get long.
T check (T) () if (is (T in validTypeSet)) {
...
}
This should probably work:
template isOneOf(X, T...)
{
static if(!T.length)
enum bool isOneOf = false;
else static if(is(X == T[0]))
enum bool isOneOf = true;
else
enum bool isOneOf = isOneOf!(X, T[1..$]);
}
T check(T) () if(isOneOf!(T, DLogical, DNumber, DText, TList, DUnit))
{
...
}
Not sure if this exists in std.traits or not, but that's where I'd look.
-Steve
Waow, great anyway! Didn't even know one can write variadic type/template param
lists.
By the way, the block of the function is a series of static if-s, one for each
allowed type. Is there any static switch? Or any other nicer way to write it than:
T check (T) () if (
is(T == DLogical) ||
is(T == DNumber) ||
is(T == DText) ||
is(T == DList) ||
is(T == DUnit)
) {
TypeCode type;
static if (is(T == DLogical))
if (this.code == LOGICAL)
return this.logical;
else
type == LOGICAL;
static if (is(T == DNumber))
if (this.code == NUMBER)
return this.number;
else
type == NUMBER;
static if (is(T == DText))
if (this.code == TEXT)
return this.text;
else
type == TEXT;
static if (is(T == DList))
if (this.code == LOGICAL)
return this.list;
else
type == LOGICAL;
static if (is(T == DUnit))
if (this.code == UNIT)
return this.unit;
else
type == UNIT;
// type error
throw new TypeError(type, this);
}
This func type-checks and returns the current value of a tagged union. I would
be very pleased with a mapping from types to type codes (tags). I can't do
without the type param, I guess, because it's the return value's type... or can
I? But the discriminating code of the union cannot be the type itself (*),
instead it's a plain code.
I thought at using TypeInfo-s as codes, which can then be mapped from types
using typeid(). But according to sizeof, this makes the code weigh 1 word
instead of one byte.
Denis
(*) Indeed. Else it would be a template generating N distinct types, which is
precisely the opposite of what a union provides.
--
_
vita es estrany
spir.wikidot.com
Re: string vs. w/char*
I've successfully used resource files with DFL. Maybe this will help: http://www.dsource.org/forums/viewtopic.php?t=5591&sid=bf2d804f1d5a3f9efccbf29ebb6cf723 You'll have to dig into the DFL library sources to find out exactly how it loads a resource file though.
Re: type set
On Mon, 28 Feb 2011 09:27:36 -0500, spir wrote:
By the way, the block of the function is a series of static if-s, one
for each allowed type. Is there any static switch? Or any other nicer
way to write it than:
T check (T) () if (
is(T == DLogical) ||
is(T == DNumber) ||
is(T == DText) ||
is(T == DList) ||
is(T == DUnit)
) {
TypeCode type;
static if (is(T == DLogical))
if (this.code == LOGICAL)
return this.logical;
else
type == LOGICAL;
static if (is(T == DNumber))
if (this.code == NUMBER)
return this.number;
else
type == NUMBER;
static if (is(T == DText))
if (this.code == TEXT)
return this.text;
else
type == TEXT;
static if (is(T == DList))
if (this.code == LOGICAL)
return this.list;
else
type == LOGICAL;
static if (is(T == DUnit))
if (this.code == UNIT)
return this.unit;
else
type == UNIT;
// type error
throw new TypeError(type, this);
}
There is a final switch, but I don't know if that works on types. You may
be stuck with static if.
When doing things like this, I'd recommend using a mapping template. For
example:
private template typeCode(T)
{
static if(is(T == DLogical)) enum typeCode = LOGICAL;
else static if(is(T == DNumber)) enum typeCode = NUMBER;
...
else static assert(0);
}
then you almost can use this to generate the right code:
if(this.code == typeCode!T)
{
static if(is(T == DUnit)) return this.unit;
else static if(...
}
You can probably replace the inner static if with a mixin, if you name
your union members properly (i.e. if you can generate the name of the
union member based on its type name or code, like DUnit dunit_val).
But at least it gives you an idea of how this can be done efficiently.
Plus avoiding large repetitive static ifs can save you from tedious
copy-pasting bugs like the one in your DList branch ;)
-Steve
Re: Ini parsing library in D ?
Tarun Ramakrishna Wrote: > Err ok, I got excited too soon. That seems to be a D1 module..anyways > I am already halfway through writing my D2 Ini parser, so I guess its > fine > > On Mon, Feb 28, 2011 at 6:07 PM, Tarun Ramakrishna wrote: > > Hi Trass, > > > > Wow! A pure, plain simple D module for ini parsing. Nice :)) > > > > Thanks! > > Tarun > > > > > > On Mon, Feb 28, 2011 at 3:34 PM, Trass3r wrote: > >> http://www.dprogramming.com/ini.php > >> > > It doesn't take much to make it work with D2. I have a working one, and has mention of what I changed so I should be able to redistribute it. I'll double check though.
range violation
With multidimensional arrays greater than 150x150, I get a range violation at run time: "core.exception.RangeError@pweight(54): Range violation" Is this a bug? Is there a work-around?
Re: string vs. w/char*
On 2/28/2011 11:08 PM, J Chapman wrote:
== Quote from Tyro[a.c.edwards] (nos...@home.com)'s article
Both implementations results in error code 1812 being returned from
GetLastError. explanation of the code reads:
ERROR_RESOURCE_DATA_NOT_FOUND
1812 (0x714)
The specified image file did not contain a resource section.
The code I'm porting initially consisted of a resource.h file, a
generic.rc file and two icons. I have not tried to include the icons and
generic.rc file in the compilation because I do not know how to as yet
and I've only used half of the resource.h file: didn't think I need the
whole thing. Could this be the reason for the error? If so could you
direct me to the explanation of how to prepare these files for inclusion
in the compilation process?
Thanks,
Andrew
You need to compile the .rc file (see
http://www.digitalmars.com/ctg/rcc.html), then add the resulting .res file
to dmd's command line.
Awesome, this does the trick. However I get get a "GP Fault"? during
execution. Using windbg, I tracked it down to this piece of code:
void Create()
{
_hwnd = CreateWindowExA(
_exStyle,
cast(const(char*))_wc.GetName(), // returns string
cast(const(char*))_windowName, // string variable
_style,
_x,
_y,
_width,
_height,
_hWndParent,
_hMenu,
_wc.GetInstance(),
_data);
assert(_hwnd, "Internal error: Window Creation Failed.");
}
The program craps at assert() but the error is generated. It just
displays a dialog box with the message: "test.exe has stopped working,
Windows is checking for a solution to the problem..."
I'm thinking that _hwnd was never initialized and that assert is access
a null pointer but I cannot be sure. Any suggestions or ideas?
Re: array idioms
On Fri, 25 Feb 2011 23:48:19 +0100, spir wrote: > we cannot even use something like memcopy because the source & target > mem areas overlap In those cases, use memmove. But maybe there's a D-ish way that's just as efficient, not sure.
Re: range violation
On Mon, 28 Feb 2011 16:07:41 +, Dr.Smith wrote: > With multidimensional arrays greater than 150x150, I get a range > violation at run time: "core.exception.RangeError@pweight(54): Range > violation" Is this a bug? Is there a work-around? Can you show some code or a test case? My sample below seems to work fine (but I'm still using an older dmd - v2.049): int[151][151] x; x[150][150] = 7; writeln(x[150][150]);
Re: type set
On 02/28/2011 03:50 PM, Steven Schveighoffer wrote:
On Mon, 28 Feb 2011 09:27:36 -0500, spir wrote:
By the way, the block of the function is a series of static if-s, one for
each allowed type. Is there any static switch? Or any other nicer way to
write it than:
T check (T) () if (
is(T == DLogical) ||
is(T == DNumber) ||
is(T == DText) ||
is(T == DList) ||
is(T == DUnit)
) {
TypeCode type;
static if (is(T == DLogical))
if (this.code == LOGICAL)
return this.logical;
else
type == LOGICAL;
static if (is(T == DNumber))
if (this.code == NUMBER)
return this.number;
else
type == NUMBER;
static if (is(T == DText))
if (this.code == TEXT)
return this.text;
else
type == TEXT;
static if (is(T == DList))
if (this.code == LOGICAL)
return this.list;
else
type == LOGICAL;
static if (is(T == DUnit))
if (this.code == UNIT)
return this.unit;
else
type == UNIT;
// type error
throw new TypeError(type, this);
}
There is a final switch, but I don't know if that works on types. You may be
stuck with static if.
When doing things like this, I'd recommend using a mapping template. For
example:
private template typeCode(T)
{
static if(is(T == DLogical)) enum typeCode = LOGICAL;
else static if(is(T == DNumber)) enum typeCode = NUMBER;
...
else static assert(0);
}
then you almost can use this to generate the right code:
if(this.code == typeCode!T)
{
static if(is(T == DUnit)) return this.unit;
else static if(...
}
That's it! This actually builds an the equivalent of an AA which keys are
types. I was looking for such a functionality for a while already.
I am in fact *contantly* annoyed in D by the fact there are no types (I mean at
runtime). On the other hand, this forces me looking for workaround, to express
my models in "distorted" ways, which lets me discover unusual features and
idioms in D's semantic dark corners ;-)
You can probably replace the inner static if with a mixin, if you name your
union members properly (i.e. if you can generate the name of the union member
based on its type name or code, like DUnit dunit_val).
Yeah, I could, as shown by the code above: lang type Xyz <--> code XYZ <--> D
impl type DXyz <--> union member xyz.
Could not be more regular, I guess ;-)
But as you may know, I 100% against string mixins. I prefere keeping the
mapping explicite without string sorcery.
(Precisely, in the toy lang I'm starting to realise, one could do that
trivially by manipulating the AST, without any dark magic. But this is another
story...)
But at least it gives you an idea of how this can be done efficiently.
Plus avoiding large repetitive static ifs can save you from tedious
copy-pasting bugs like the one in your DList branch ;)
Good catch, Steve! And thank you again.
PS: Is it your email client that eats whitespace (see my code above)?
Denis
--
_
vita es estrany
spir.wikidot.com
Some weird crashes
I'm trying to wrap the newest mysql c connector, but I get some weird bugs. I don't know any assembly, so I don't even know if I've included enough info.. I hope this is a small enough test case so someone can understand the issue. I've used implib on the included dll and rdmd and dmd 2.051 to compile. // CORRECT auto res = mysql_library_init(0, null, null); auto cn = mysql_init(null); auto oldcn = cn; writeln(mysql_errno(cn)); assert(cn == oldcn); auto err = mysql_errno(cn); //assert(cn == oldcn); // notice this is commented out mysql_close(cn); mysql_library_end(); 0040201A |. E8 F5B30300CALL 0040201F |. 6A 00 PUSH 0 00402021 |. E8 E8B30300CALL 00402026 |. 8945 F8MOV DWORD PTR SS:[EBP-8],EAX 00402029 |. 8945 FCMOV DWORD PTR SS:[EBP-4],EAX 0040202C |. FF75 F8PUSH DWORD PTR SS:[EBP-8] 0040202F |. E8 D4B30300CALL 00402034 |. 83C4 04ADD ESP,4 00402037 |. E8 4C00CALL mytest_w.00402088 0040203C |. 8B45 F8MOV EAX,DWORD PTR SS:[EBP-8] 0040203F |. 3B45 FCCMP EAX,DWORD PTR SS:[EBP-4] 00402042 |. B9 0100MOV ECX,1 00402047 |. 74 02 JE SHORT mytest_w.0040204B 00402049 |. 8ACD MOV CL,CH 0040204B |> 894D F4MOV DWORD PTR SS:[EBP-C],ECX 0040204E |. 74 0A JE SHORT mytest_w.0040205A 00402050 |. B8 1A00MOV EAX,1A 00402055 |. E8 662ACALL mytest_w.00404AC0 0040205A |> FF75 F8PUSH DWORD PTR SS:[EBP-8] 0040205D |. E8 A6B30300CALL 00402062 |. 807D F4 00 CMP BYTE PTR SS:[EBP-C],0 00402066 |. 75 0A JNZ SHORT mytest_w.00402072 00402068 |. B8 1D00MOV EAX,1D 0040206D |. E8 4E2ACALL mytest_w.00404AC0 00402072 |> FF75 F8PUSH DWORD PTR SS:[EBP-8] 00402075 |. E8 88B30300CALL 0040207A |. E8 7DB30300CALL 0040207F |. 31C0 XOR EAX,EAX 00402081 |. 83C4 18ADD ESP,18 00402084 |. C9 LEAVE 00402085 \. C3 RETN // ERROR auto res = mysql_library_init(0, null, null); auto cn = mysql_init(null); auto oldcn = cn; writeln(mysql_errno(cn)); assert(cn == oldcn); // when the last assert is active, the above line changes cn and thus fails. auto err = mysql_errno(cn); assert(cn == oldcn); mysql_close(cn); mysql_library_end(); 0040201A |. E8 D5B30300CALL 0040201F |. 6A 00 PUSH 0 00402021 |. E8 C8B30300CALL 00402026 |. 8945 F8MOV DWORD PTR SS:[EBP-8],EAX 00402029 |. 8945 FCMOV DWORD PTR SS:[EBP-4],EAX 0040202C |. FF75 F8PUSH DWORD PTR SS:[EBP-8] 0040202F |. E8 B4B30300CALL 00402034 |. 83C4 04ADD ESP,4 00402037 |. E8 3000CALL mytest_f.0040206C 0040203C |. 8B45 F8MOV EAX,DWORD PTR SS:[EBP-8] 0040203F |. 3B45 FCCMP EAX,DWORD PTR SS:[EBP-4] 00402042 |. 74 0A JE SHORT mytest_f.0040204E 00402044 |. B8 1A00MOV EAX,1A 00402049 |. E8 562ACALL mytest_f.00404AA4 0040204E |> FF75 F8PUSH DWORD PTR SS:[EBP-8] 00402051 |. E8 92B30300CALL 00402056 |. FF75 F8PUSH DWORD PTR SS:[EBP-8] 00402059 |. E8 84B30300CALL 0040205E |. E8 79B30300CALL 00402063 |. 31C0 XOR EAX,EAX 00402065 |. 83C4 18ADD ESP,18 00402068 |. C9 LEAVE 00402069 \. C3 RETN
Re: string vs. w/char*
On Mon, 28 Feb 2011 19:35:47 +0300, Tyro[a.c.edwards]
wrote:
On 2/28/2011 11:08 PM, J Chapman wrote:
== Quote from Tyro[a.c.edwards] (nos...@home.com)'s article
Both implementations results in error code 1812 being returned from
GetLastError. explanation of the code reads:
ERROR_RESOURCE_DATA_NOT_FOUND
1812 (0x714)
The specified image file did not contain a resource section.
The code I'm porting initially consisted of a resource.h file, a
generic.rc file and two icons. I have not tried to include the icons
and
generic.rc file in the compilation because I do not know how to as yet
and I've only used half of the resource.h file: didn't think I need the
whole thing. Could this be the reason for the error? If so could you
direct me to the explanation of how to prepare these files for
inclusion
in the compilation process?
Thanks,
Andrew
You need to compile the .rc file (see
http://www.digitalmars.com/ctg/rcc.html), then add the resulting .res
file
to dmd's command line.
Awesome, this does the trick. However I get get a "GP Fault"? during
execution. Using windbg, I tracked it down to this piece of code:
void Create()
{
_hwnd = CreateWindowExA(
_exStyle,
cast(const(char*))_wc.GetName(), // returns string
cast(const(char*))_windowName, // string variable
_style,
_x,
_y,
_width,
_height,
_hWndParent,
_hMenu,
_wc.GetInstance(),
_data);
assert(_hwnd, "Internal error: Window Creation Failed.");
}
The program craps at assert() but the error is generated. It just
displays a dialog box with the message: "test.exe has stopped working,
Windows is checking for a solution to the problem..."
I'm thinking that _hwnd was never initialized and that assert is access
a null pointer but I cannot be sure. Any suggestions or ideas?
The
cast(const(char*))_wc.GetName()
line look *very* suspicious. You can't get a string and just cast it to
const(char)*. Most importantly, the string (most likely) is not
null-terminated.
What you need to do here is the following:
auto className = toStringz(_ws.GetName());
auto caption = toStringz(_windowName);
and pass those 2 to the function.
Alternatively, you could make sure your strings are null-terminated and
pass the pointer directly (e.g. _windowName.ptr):
string _windowName = "foo"; // null-terminated automatically
string _caption = ("Hello, World" ~ "\0")[0..$-1]; // append trailing zero
to an existing string but exclude it from result (so that it's not
included in _caption.length)
Re: type set
On Mon, 28 Feb 2011 12:50:21 -0500, spir wrote: PS: Is it your email client that eats whitespace (see my code above)? Only in your reply does the code appear indented improperly, so I think it's your client, not mine. -steve
Re: type set
Steven Schveighoffer:
> Not sure if this exists in std.traits or not, but that's where I'd look.
std.typetuple.anySatisfy helps here.
---
spir:
> Is there any static switch?
foreach done on a typetuple is a static foreach.
> Or any other nicer way to write it than:
I suggest to put the types in a typetuple and use a foreach(i, T,
TypeTuple!(t1, t2, ...)), put your values in another typetuple and use the i
index to access and return the values.
import std.stdio, std.typetuple;
int mapper(TX)() {
alias TypeTuple!(int, float, string) Tkeys;
enum values = [100, 5, 2];
//alias TypeTuple!(100, 5, 2) Tvalues; // alternative
foreach (i, T; Tkeys)
if (is(T == TX))
return values[i];
assert(0, "Can't happen");
}
enum r = mapper!float();
static assert(r == 5);
void main() {}
Bye,
bearophile
How-to manipulate a C array with D2 vector operations?
Hi I am trying to implement a D2 function that has this C signature (it gets called from a C module and I cannot change the caller): extern(C) read_into(char *buffer, size_t buf_len); I would like to use D's vector (or array-wise according to TDPL) operations on buffer but I cannot find a way, how I could initialize a (static?) D array and tell it to use buffer as its memory. Obviously I don't want to copy buffer in a regular D array to be able to do the manipulations and than having to copy everything back into buffer. Is there any way to get this accomplished? Thanks, Lars
Re: How-to manipulate a C array with D2 vector operations?
On Mon, 28 Feb 2011 19:51:28 +0300, Lars Holowko wrote: Hi I am trying to implement a D2 function that has this C signature (it gets called from a C module and I cannot change the caller): extern(C) read_into(char *buffer, size_t buf_len); I would like to use D's vector (or array-wise according to TDPL) operations on buffer but I cannot find a way, how I could initialize a (static?) D array and tell it to use buffer as its memory. Obviously I don't want to copy buffer in a regular D array to be able to do the manipulations and than having to copy everything back into buffer. Is there any way to get this accomplished? Thanks, Lars Here you go: auto arr = buffer[0..buf_len]; Now you can operate on this array however you like. E.g. arr[] = 0; // initialize with zeros
Re: How-to manipulate a C array with D2 vector operations?
I am trying to implement a D2 function that has this C signature (it gets called from a C module and I cannot change the caller): extern(C) read_into(char *buffer, size_t buf_len); I would like to use D's vector (or array-wise according to TDPL) operations on buffer but I cannot find a way, how I could initialize a auto darray = buffer[0 .. buf_len]
Re: Ini parsing library in D ?
Jesse Phillips Wrote: > It doesn't take much to make it work with D2. I have a working one, and has > mention of what I changed so I should be able to redistribute it. I'll double > check though. Here it is: https://github.com/he-the-great/ini.d/tree/D2 The master branch should also work with D1 and D2 compilers before 2.052. Maybe I should just update the catch block to capture Throwable there. The D2 branch has annotations too.
Re: Some weird crashes
On 28.02.2011 18:52, simendsjo wrote: // ERROR auto res = mysql_library_init(0, null, null); auto cn = mysql_init(null); auto oldcn = cn; writeln(mysql_errno(cn)); assert(cn == oldcn); // when the last assert is active, the above line changes cn and thus fails. auto err = mysql_errno(cn); assert(cn == oldcn); Btw, if I don't use writeln it doesn't fail..
Re: Some weird crashes
On Mon, 28 Feb 2011 22:04:44 +0300, simendsjo wrote: On 28.02.2011 18:52, simendsjo wrote: // ERROR auto res = mysql_library_init(0, null, null); auto cn = mysql_init(null); auto oldcn = cn; writeln(mysql_errno(cn)); assert(cn == oldcn); // when the last assert is active, the above line changes cn and thus fails. auto err = mysql_errno(cn); assert(cn == oldcn); Btw, if I don't use writeln it doesn't fail.. I think you have a bug at line 42. On a serious note, it might have helped if you'd attached source code, or at least binaries.
Is std.regex.match completely broken?
The following code will result in an AssertError or RangeError when run.
import std.regex;
import std.stdio;
void main ()
{
auto m = "abc".match(`a(\w)b`);
writeln(m.hit); // AssertError in regex.d:1795
writeln(m.captures); // RangeError in regex.d:1719
}
Should I report this as a bug?
--
/Jacob Carlborg
Re: Some weird crashes
On 28.02.2011 20:24, Denis Koroskin wrote: I think you have a bug at line 42. On a serious note, it might have helped if you'd attached source code, or at least binaries. The file was too large to be attached. Here's a link to a public hosting service: http://share1t.com/4xgt2l. Everything (including mysql libraries) is included. Not sure what line you are referring to though.
Re: Ini parsing library in D ?
Hi Jesse, This list is filled with terrific people and you are one of them :) Thanks! Tarun On Tue, Mar 1, 2011 at 12:01 AM, Jesse Phillips wrote: > Jesse Phillips Wrote: > >> It doesn't take much to make it work with D2. I have a working one, and has >> mention of what I changed so I should be able to redistribute it. I'll >> double check though. > > Here it is: > > https://github.com/he-the-great/ini.d/tree/D2 > > The master branch should also work with D1 and D2 compilers before 2.052. > Maybe I should just update the catch block to capture Throwable there. The D2 > branch has annotations too. >
Re: Some weird crashes
simendsjo: > Not sure what line you are referring to though. http://en.wikipedia.org/wiki/Answer_to_Life,_the_Universe,_and_Everything#The_number_42 Bye, bearophile
RPM Package management
I would like to get involved with the rpm build process. Who can I contact to get more information on what help I can provide?
Re: Defining type coercion
Jonathan M Davis wrote:
struct Ordinal {
private int representation;
char getChar( ) {
return representation + 'a'-1;
}
alias representation this;
alias getChar this;
}
But like I said, it currently does not work.
Would "alias getChar this" really be legal? I thought that this had to be
aliased to a type.
Alias function this; works.
--
Simen
Re: range violation
For example:
double [string] data;
double [200][1000] data2;
for(int i = 0; i < 200; i++) {
for(int j = 0; j < 1000; j++) {
// fake multi-dim works
string str = to!string(i) ~ "," ~ to!string(j);
data[str] = someNumber;
// real multi-dim does not work
data2[i][j] = someNumber;
}
}
Re: range violation
Dr.Smith:
> For example:
>
> double [string] data;
> double [200][1000] data2;
>
> for(int i = 0; i < 200; i++) {
> for(int j = 0; j < 1000; j++) {
>
> // fake multi-dim works
> string str = to!string(i) ~ "," ~ to!string(j);
> data[str] = someNumber;
>
> // real multi-dim does not work
> data2[i][j] = someNumber;
> }
> }
You receive the same stack overflow error with this simpler code:
void main() {
double[200][1000] a;
}
Keep in mind this is a fixed-sized array, so it's allocated on the stack.
On Windows with DMD if you add a switch like this, to increase max stack size,
that code works:
-L/STACK:1000
Bye,
bearophile
Re: range violation
That's because data2 has length 1000, each of which has an array of
length 200. Not the other way around. This works:
double[200][1000] data2;
void main()
{
for(int i = 0; i < 1000; i++) {
for(int j = 0; j < 200; j++) {
data2[i][j] = 4.0;
}
}
}
Re: Ini parsing library in D ?
Tarun Ramakrishna wrote: > Hi, > > Do we have a ini parser in D somewhere ? If not, is there some > documentation anywhere that tells one how to wrap a simple C++ library > like simple ini ? (Of course it isn't difficult to build a quick > parser, just that someone would done this already) > Here (D1+phobos): https://bitbucket.org/jmb/spacecuted/src/tip/src/scd/settings.d Jerome -- mailto:jeber...@free.fr http://jeberger.free.fr Jabber: jeber...@jabber.fr signature.asc Description: OpenPGP digital signature
Re: How-to manipulate a C array with D2 vector operations?
On 2/28/2011 10:15 AM, Denis Koroskin wrote: On Mon, 28 Feb 2011 19:51:28 +0300, Lars Holowko wrote: gets called from a C module and I cannot change the caller): extern(C) read_into(char *buffer, size_t buf_len); I would like to use D's vector (or array-wise according to TDPL) operations on buffer but I cannot find a way, how I could initialize a (static?) D array and tell it to use buffer as its memory. Obviously I Here you go: auto arr = buffer[0..buf_len]; Now you can operate on this array however you like. E.g. arr[] = 0; // initialize with zeros Thanks Denis and Trass3r, that was embarrasingly easy ;-)
Re: string vs. w/char*
== Quote from Denis Koroskin (2kor...@gmail.com)'s article
> On Mon, 28 Feb 2011 19:35:47 +0300, Tyro[a.c.edwards]
> wrote:
> > On 2/28/2011 11:08 PM, J Chapman wrote:
> >> == Quote from Tyro[a.c.edwards] (nos...@home.com)'s article
> >>> Both implementations results in error code 1812 being
returned from
> >>> GetLastError. explanation of the code reads:
> >>>ERROR_RESOURCE_DATA_NOT_FOUND
> >>>1812 (0x714)
> >>>The specified image file did not contain a resource
section.
> >>> The code I'm porting initially consisted of a resource.h
file, a
> >>> generic.rc file and two icons. I have not tried to include
the icons
> >>> and
> >>> generic.rc file in the compilation because I do not know how
to as yet
> >>> and I've only used half of the resource.h file: didn't think
I need the
> >>> whole thing. Could this be the reason for the error? If so
could you
> >>> direct me to the explanation of how to prepare these files
for
> >>> inclusion
> >>> in the compilation process?
> >>> Thanks,
> >>> Andrew
> >>
> >> You need to compile the .rc file (see
> >> http://www.digitalmars.com/ctg/rcc.html), then add the
resulting .res
> >> file
> >> to dmd's command line.
> >
> > Awesome, this does the trick. However I get get a "GP Fault"?
during
> > execution. Using windbg, I tracked it down to this piece of
code:
> >
> > void Create()
> > {
> >_hwnd = CreateWindowExA(
> > _exStyle,
> > cast(const(char*))_wc.GetName(), // returns string
> > cast(const(char*))_windowName, // string variable
> > _style,
> > _x,
> > _y,
> > _width,
> > _height,
> > _hWndParent,
> > _hMenu,
> > _wc.GetInstance(),
> > _data);
> >
> > assert(_hwnd, "Internal error: Window Creation Failed.");
> > }
> >
> > The program craps at assert() but the error is generated. It
just
> > displays a dialog box with the message: "test.exe has stopped
working,
> > Windows is checking for a solution to the problem..."
> >
> > I'm thinking that _hwnd was never initialized and that assert
is access
> > a null pointer but I cannot be sure. Any suggestions or ideas?
> The
> > cast(const(char*))_wc.GetName()
> line look *very* suspicious. You can't get a string and just
cast it to
> const(char)*. Most importantly, the string (most likely) is not
> null-terminated.
> What you need to do here is the following:
> auto className = toStringz(_ws.GetName());
> auto caption = toStringz(_windowName);
> and pass those 2 to the function.
Actually I've already tried that, it has no effect on the outcome.
>From your suggestion though, I've gone back and replace all the
cast(const(char*)) usage throughout the program. Final verdict:
the program still crashes it the same location. It actually never
returns from CreateWindowExA().
> Alternatively, you could make sure your strings are null-
terminated and
> pass the pointer directly (e.g. _windowName.ptr):
> string _windowName = "foo"; // null-terminated automatically
> string _caption = ("Hello, World" ~ "\0")[0..$-1]; // append
trailing zero
> to an existing string but exclude it from result (so that it's
not
> included in _caption.length)
Template argument deduction
I have...
import std.stdio;
int main(string[] args) {
foo([[1,2],[3,4],[5,6]]); // ERROR [1]
bar([[1,2],[3,4],[5,6]]); // OK
foo!int([[1,2],[3,4],[5,6]]); // OK
return 0;
}
void foo(T)(T[2][] t) {
writeln(typeid(t));
}
void bar(T)(T[][] t) {
writeln(typeid(t));
}
[1]
src\main.d(4): Error: template main.foo(T) does not match any function
template declaration
src\main.d(4): Error: template main.foo(T) cannot deduce template
function from argument types !()(int[][])
Why can't compiler deduce template parameters from arguments in the
first instantiation?
Thanks in advance,
Tom;
Re: Template argument deduction
On 02/28/2011 07:39 PM, Tom wrote:
I have...
import std.stdio;
int main(string[] args) {
foo([[1,2],[3,4],[5,6]]); // ERROR [1]
bar([[1,2],[3,4],[5,6]]); // OK
foo!int([[1,2],[3,4],[5,6]]); // OK
return 0;
}
void foo(T)(T[2][] t) {
writeln(typeid(t));
}
void bar(T)(T[][] t) {
writeln(typeid(t));
}
[1]
src\main.d(4): Error: template main.foo(T) does not match any function
template declaration
src\main.d(4): Error: template main.foo(T) cannot deduce template
function from argument types !()(int[][])
Why can't compiler deduce template parameters from arguments in the
first instantiation?
Thanks in advance,
Tom;
That's because the type of literals like [1, 2] are slices (dynamic
arrays), not fixed-sized arrays.
import std.stdio;
void main()
{
writeln(typeof([1,2]).stringof);
}
The output of that program is
int[]
Ali
Re: string vs. w/char*
On Tue, 01 Mar 2011 02:08:48 +0300, Tyro[a.c.edwards]
wrote:
== Quote from Denis Koroskin (2kor...@gmail.com)'s article
On Mon, 28 Feb 2011 19:35:47 +0300, Tyro[a.c.edwards]
wrote:
> On 2/28/2011 11:08 PM, J Chapman wrote:
>> == Quote from Tyro[a.c.edwards] (nos...@home.com)'s article
>>> Both implementations results in error code 1812 being
returned from
>>> GetLastError. explanation of the code reads:
>>>ERROR_RESOURCE_DATA_NOT_FOUND
>>>1812 (0x714)
>>>The specified image file did not contain a resource
section.
>>> The code I'm porting initially consisted of a resource.h
file, a
>>> generic.rc file and two icons. I have not tried to include
the icons
>>> and
>>> generic.rc file in the compilation because I do not know how
to as yet
>>> and I've only used half of the resource.h file: didn't think
I need the
>>> whole thing. Could this be the reason for the error? If so
could you
>>> direct me to the explanation of how to prepare these files
for
>>> inclusion
>>> in the compilation process?
>>> Thanks,
>>> Andrew
>>
>> You need to compile the .rc file (see
>> http://www.digitalmars.com/ctg/rcc.html), then add the
resulting .res
>> file
>> to dmd's command line.
>
> Awesome, this does the trick. However I get get a "GP Fault"?
during
> execution. Using windbg, I tracked it down to this piece of
code:
>
> void Create()
> {
>_hwnd = CreateWindowExA(
> _exStyle,
> cast(const(char*))_wc.GetName(), // returns string
> cast(const(char*))_windowName, // string variable
> _style,
> _x,
> _y,
> _width,
> _height,
> _hWndParent,
> _hMenu,
> _wc.GetInstance(),
> _data);
>
> assert(_hwnd, "Internal error: Window Creation Failed.");
> }
>
> The program craps at assert() but the error is generated. It
just
> displays a dialog box with the message: "test.exe has stopped
working,
> Windows is checking for a solution to the problem..."
>
> I'm thinking that _hwnd was never initialized and that assert
is access
> a null pointer but I cannot be sure. Any suggestions or ideas?
The
> cast(const(char*))_wc.GetName()
line look *very* suspicious. You can't get a string and just
cast it to
const(char)*. Most importantly, the string (most likely) is not
null-terminated.
What you need to do here is the following:
auto className = toStringz(_ws.GetName());
auto caption = toStringz(_windowName);
and pass those 2 to the function.
Actually I've already tried that, it has no effect on the outcome.
From your suggestion though, I've gone back and replace all the
cast(const(char*)) usage throughout the program. Final verdict:
the program still crashes it the same location. It actually never
returns from CreateWindowExA().
Alternatively, you could make sure your strings are null-
terminated and
pass the pointer directly (e.g. _windowName.ptr):
string _windowName = "foo"; // null-terminated automatically
string _caption = ("Hello, World" ~ "\0")[0..$-1]; // append
trailing zero
to an existing string but exclude it from result (so that it's
not
included in _caption.length)
This is indeed strange, but it has nothing to do with the function itself.
I still think the parameters you are passing might be invalid. Try setting
them to default values and see if that helps. Also try wrapping the call
with a try/catch block and output an exception you are getting (if any).
Mixins: to!string cannot be interpreted at compile time
I'm trying to use mixins to generate an array of numbers that are coprime to a
statically known value. I've tried the following, but I receive the error:
Error: to(i) ~ ", " cannot be interpreted at compile time
string makePossibleAValues(string name, byte m) {
string result = "immutable byte[] "~name~" = [";
foreach (i; 0 .. m) {
if (coprime(i, m)) {
result ~= to!string(i) ~ ", ";
}
}
return result ~ "];";
}
bool coprime(ulong a, ulong b) {
return gcd(a, b) == 1;
}
ulong gcd(ulong a, ulong b) {
while (b) {
auto t = b;
b = a % b;
a = t;
}
return a;
}
mixin(makePossibleAValues("aValues", 26));
makePossibleAValues("aValues", 26) produces the correct result, "immutable
byte[] aValues = [1, 3, 5, 7, 9, 11, 15, 17, 19, 21, 23, 25, ];", at runtime
and I know to!string can be used in mixins. Any idea as to why this particular
code is having trouble with to!string?
