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digitalmars.D.learn - Error instantiating std.container.Array

reply "Francesco Cattoglio" <francesco.cattoglio gmail.com> writes:
I'm trying to instantiate a std.container.Array of a given class 
(named Material), by a simple
Array!Material _myStuff;
I get two compile errors stating the following:

C:\D\dmd2\windows\bin\..\..\src\phobos\std\container\array.d(85):
Error: template std.algorithm.initializeAll cannot deduce 
function from argument types !()(Material[]), candidates are:
   C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(1502):
     std.algorithm.initializeAll(Range)(Range range)
     if (isInputRange!Range
       && hasLvalueElements!Range
       && hasAssignableElements!Range)
   C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(1530):
     std.algorithm.initializeAll(Range)(Range range)
     if (is(Range == char[]) || is(Range == wchar[]))
C:\D\dmd2\windows\bin\..\..\src\phobos\std\container\array.d(825): 
Error: template std.algorithm.copy cannot deduce function from 
argument types !()(Range, Range), candidates are:
   C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(7808):
     std.algorithm.copy(Range1, Range2)(Range1 source, Range2 
target)
     if (isInputRange!Range1 && isOutputRange!(Range2, 
ElementType!Range1))

Any idea about what might be happening? I can't give a quick 
minimal example of the code since it is quite complex (and I 
failed at using dustmite trying to minimize it)
Mar 02 2015
parent reply "Tobias Pankrath" <tobias pankrath.net> writes:
On Monday, 2 March 2015 at 14:08:29 UTC, Francesco Cattoglio 
wrote:

 I'm trying to instantiate a std.container.Array of a given 
 class (named Material), by a simple
 Array!Material _myStuff;
 I get two compile errors stating the following:

 C:\D\dmd2\windows\bin\..\..\src\phobos\std\container\array.d(85):
 Error: template std.algorithm.initializeAll cannot deduce 
 function from argument types !()(Material[]), candidates are:
   C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(1502):
     std.algorithm.initializeAll(Range)(Range range)
     if (isInputRange!Range
       && hasLvalueElements!Range
       && hasAssignableElements!Range)
   C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(1530):
     std.algorithm.initializeAll(Range)(Range range)
     if (is(Range == char[]) || is(Range == wchar[]))
 C:\D\dmd2\windows\bin\..\..\src\phobos\std\container\array.d(825): 
 Error: template std.algorithm.copy cannot deduce function from 
 argument types !()(Range, Range), candidates are:
   C:\D\dmd2\windows\bin\..\..\src\phobos\std\algorithm.d(7808):
     std.algorithm.copy(Range1, Range2)(Range1 source, Range2 
 target)
     if (isInputRange!Range1 && isOutputRange!(Range2, 
 ElementType!Range1))

 Any idea about what might be happening? I can't give a quick 
 minimal example of the code since it is quite complex (and I 
 failed at using dustmite trying to minimize it)


Try to reduce your Material class for a small failing example. 
It's probably your constructors or opAssign or something like 
that. Anyway, it's a bug if template errors from the 
implementation bubble up, so please file a report.
Mar 02 2015
parent reply "Francesco Cattoglio" <francesco.cattoglio gmail.com> writes:
On Monday, 2 March 2015 at 14:14:19 UTC, Tobias Pankrath wrote:

 Try to reduce your Material class for a small failing example. 
 It's probably your constructors or opAssign or something like 
 that. Anyway, it's a bug if template errors from the 
 implementation bubble up, so please file a report.


I'm still trying now, with no luck.
I also tried to get a Material[] instead of an Array!Material. It 
compiles, but when I call std.algorithm.sort on it I get another 
funny error, which apparently not even google can find except for 
one lonely test unit:

C:\D\dmd2\windows\bin\..\..\src\phobos\std\range.d(2222): Error: 
cannot have parameter of function type void()
C:\D\dmd2\windows\bin\..\..\src\phobos\std\range.d(2278): Error: 
cannot have parameter of function type void()
C:\D\dmd2\windows\bin\..\..\src\phobos\std\range.d(2306): Error: 
cannot have parameter of function type void()

Following a few more lines concerning who tried to instantiate it:
....\src\phobos\std\range.d(8385): Error: template instance 
std.range.stride!(Material[]) error instantiating
....\src\phobos\std\algorithm.d(9383): instantiated from here: 
SortedRange!(Material[], "a.step < b.step")
....\material.d(15): instantiated from here: sort!("a.step < 
b.step", cast (SwapStrategy)0, Material[])

(".step" is a class member variable, it's a simple int)
I'm really clueless... :P
Mar 02 2015
next sibling parent reply ketmar <ketmar ketmar.no-ip.org> writes:
On Mon, 02 Mar 2015 14:40:50 +0000, Francesco Cattoglio wrote:

did you tried to dustmite[1] it?

[1] https://github.com/CyberShadow/DustMite/wiki=
Mar 02 2015
parent "Francesco Cattoglio" <francesco.cattoglio gmail.com> writes:
On Monday, 2 March 2015 at 14:46:31 UTC, ketmar wrote:

 On Mon, 02 Mar 2015 14:40:50 +0000, Francesco Cattoglio wrote:

 did you tried to dustmite[1] it?

 [1] https://github.com/CyberShadow/DustMite/wiki


I tried to "dub dustmite", but it failed with a 
"object.Exception DustMite\dustmite.d(220): Initial test fails"

The dustmite version is the one that was bundled with dmd 
2.066.1-rc2.

I'll update dmd in the mean time, but I have a feeling that this 
is not related.
Mar 02 2015
prev sibling parent reply "Tobias Pankrath" <tobias pankrath.net> writes:
 I'm really clueless... :P


Something is wrong with your Material class, but you'll need to 
show us a reduced example.
Mar 02 2015
parent reply "Francesco Cattoglio" <francesco.cattoglio gmail.com> writes:
On Monday, 2 March 2015 at 15:01:55 UTC, Tobias Pankrath wrote:

 I'm really clueless... :P


 Something is wrong with your Material class, but you'll need to 
 show us a reduced example.


After a really long time I finally found what was wrong.

http://dpaste.dzfl.pl/16d202b7124d

Wow, I honestly could have NEVER foreseen this.
This is all it takes for a class being unusable in a 
std.container.Array
class MyClass
{
	void init();
}
Mar 02 2015
next sibling parent "Tobias Pankrath" <tobias pankrath.net> writes:
On Monday, 2 March 2015 at 15:14:49 UTC, Francesco Cattoglio 
wrote:

 On Monday, 2 March 2015 at 15:01:55 UTC, Tobias Pankrath wrote:

 I'm really clueless... :P


 Something is wrong with your Material class, but you'll need 
 to show us a reduced example.


 After a really long time I finally found what was wrong.

 http://dpaste.dzfl.pl/16d202b7124d

 Wow, I honestly could have NEVER foreseen this.
 This is all it takes for a class being unusable in a 
 std.container.Array
 class MyClass
 {
 	void init();
 }


.init is a special property of every type: 
http://dlang.org/property.html#init
Mar 02 2015
prev sibling parent =?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:
On 03/02/2015 07:14 AM, Francesco Cattoglio wrote:

 On Monday, 2 March 2015 at 15:01:55 UTC, Tobias Pankrath wrote:

 I'm really clueless... :P


 Something is wrong with your Material class, but you'll need to show
 us a reduced example.


 After a really long time I finally found what was wrong.

 http://dpaste.dzfl.pl/16d202b7124d

 Wow, I honestly could have NEVER foreseen this.
 This is all it takes for a class being unusable in a std.container.Array
 class MyClass
 {
      void init();
 }


Existing issue:

   https://issues.dlang.org/show_bug.cgi?id=12545

Ali
Mar 02 2015