I've fixed several limitations in std.traits.fullyQualifiedName
/ packageName / moduleName but still have issues with templated types /
functions:

currently:
struct A{}
std.traits.fullyQualifiedName!(A!(int)) => CT error.

attempt to fix it:

----
template Stringof(alias T){
static if (!isCallable!T) enum Stringof = T.stringof;
else enum Stringof = __traits(identifier, T);
}
template isTemplateInstantiation(alias T){
import std.algorithm;
enum isTemplateInstantiation=Stringof!T.canFind(`!`);
}
template fullyQualifiedName(alias T)
{
static if (isTemplateInstantiation!T){
enum s=Stringof!T;
import std.algorithm;
enum s2=s.findSplit("!");
mixin(`alias temp=`~s2[0]~`;`);
enum fullyQualifiedName =fullyQualifiedName!temp~s2[1]~s2[2];
}
        else{...}
}

version(unittest){
  struct A(T1,T2){}
}
unittest{
  static assert(fullyQualifiedName!(A!(int,double)) == "util.traits.A!(int,
double)");
}
----

however, it works only when "A" is visible in the scope of
fullyQualifiedName, so it's pretty useless as it is. A potential fix would
be to require the user to use a mixin
(mixin(fullyQualifiedNameMixin!(A!double)) ) but that's ugly.

What we need:
__traits(getTemplate, A!T) => A
__traits(getTemplateArguments, A!(T,"foo")) => (T,"foo") (ie returns a
tuple as in parameterTypeTuple or similar)

any thoughts?

http://dpaste.1azy.net/22d5eee2

------------------------------------

import std.traits;

template getTemplate(T)
{
	static if (is(T == TI!TP, alias TI, TP))
	{
		alias getTemplate = TI;
	}
	else
		static assert (false);
}

private struct A(T)
{
	T x;
}

pragma( msg, fullyQualifiedName!(getTemplate!(A!int)) );

void main()
{
}

On 06/23/2013 01:03 AM, Dicebot wrote:
> http://dpaste.1azy.net/22d5eee2
>
> ------------------------------------
>
> import std.traits;
>
> template getTemplate(T)
> {
>      static if (is(T == TI!TP, alias TI, TP))
>      {
>          alias getTemplate = TI;
>      }
>      else
>          static assert (false);
> }
>
> private struct A(T)
> {
>      T x;
> }
>
> pragma( msg, fullyQualifiedName!(getTemplate!(A!int)) );
>
> void main()
> {
> }


Only works for types.

On Saturday, 22 June 2013 at 23:03:17 UTC, Dicebot wrote:
> http://dpaste.1azy.net/22d5eee2
>
> ------------------------------------
>
> import std.traits;
>
> template getTemplate(T)
> {
> 	static if (is(T == TI!TP, alias TI, TP))

alias! Of course!

> 	{
> 		alias getTemplate = TI;
> 	}
> 	else
> 		static assert (false);
> }

Replacing the static if with template specialization makes it shorter:
template getTemplate(T : TI!TP, alias TI, TP)
{
    alias getTemplate = TI;
}

On Sat, Jun 22, 2013 at 4:18 PM, anonymous <anonymous@example.com> wrote:

> On Saturday, 22 June 2013 at 23:03:17 UTC, Dicebot wrote:
>
>> http://dpaste.1azy.net/**22d5eee2 <http://dpaste.1azy.net/22d5eee2>
>>
>> ------------------------------**------
>>
>> import std.traits;
>>
>> template getTemplate(T)
>> {
>>         static if (is(T == TI!TP, alias TI, TP))
>>
>
> alias! Of course!
>
>
>          {
>>                 alias getTemplate = TI;
>>         }
>>         else
>>                 static assert (false);
>> }
>>
>
> Replacing the static if with template specialization makes it shorter:
> template getTemplate(T : TI!TP, alias TI, TP)
> {
>     alias getTemplate = TI;
> }
>

great, thanks!
improved to support arbitrary number of a
template getTemplate(T : TI!TP, alias TI, TP...)
{
alias getTemplate = TI;
}


however, indeed seems to work with types only, not functions.

On Saturday, 22 June 2013 at 23:57:17 UTC, Timothee Cour wrote:
> template getTemplate(T : TI!TP, alias TI, TP...)
> {
> alias getTemplate = TI;
> }
>
>
> however, indeed seems to work with types only, not functions.

Just add another overload (is that the correct term?) with alias T:

template getTemplate(alias T : TI!TP, alias TI, TP...)
{
alias getTemplate = TI;
}

On Sat, Jun 22, 2013 at 5:07 PM, anonymous <anonymous@example.com> wrote:

> On Saturday, 22 June 2013 at 23:57:17 UTC, Timothee Cour wrote:
>
>> template getTemplate(T : TI!TP, alias TI, TP...)
>> {
>> alias getTemplate = TI;
>> }
>>
>>
>> however, indeed seems to work with types only, not functions.
>>
>
> Just add another overload (is that the correct term?) with alias T:
>
> template getTemplate(alias T : TI!TP, alias TI, TP...)
> {
> alias getTemplate = TI;
> }
>

did you test it? doesn't work for me:

 auto fun(T)(T x){return x;}
pragma(msg,__LINE__,":",getTemplate!(fun!double));

Error: template instance getTemplate!(fun) does not match template
declaration getTemplate(alias T : TI!(TP), alias TI, TP...)

On Sunday, 23 June 2013 at 00:18:23 UTC, Timothee Cour wrote:
> On Sat, Jun 22, 2013 at 5:07 PM, anonymous <anonymous@example.com> wrote:
[...]
>> template getTemplate(alias T : TI!TP, alias TI, TP...)
>> {
>> alias getTemplate = TI;
>> }
>>
>
> did you test it? doesn't work for me:
>
>  auto fun(T)(T x){return x;}
> pragma(msg,__LINE__,":",getTemplate!(fun!double));
>
> Error: template instance getTemplate!(fun) does not match template
> declaration getTemplate(alias T : TI!(TP), alias TI, TP...)

Oh, sorry. I had tested it with generic templates and assumed it would work with everything that's not a type. No ideas on how to make it work with function templates then.

On Sat, Jun 22, 2013 at 5:24 PM, anonymous <anonymous@example.com> wrote:

> On Sunday, 23 June 2013 at 00:18:23 UTC, Timothee Cour wrote:
>
>> On Sat, Jun 22, 2013 at 5:07 PM, anonymous <anonymous@example.com> wrote:
>>
> [...]
>
>> template getTemplate(alias T : TI!TP, alias TI, TP...)
>>> {
>>> alias getTemplate = TI;
>>> }
>>>
>>>
>> did you test it? doesn't work for me:
>>
>>  auto fun(T)(T x){return x;}
>> pragma(msg,__LINE__,":",**getTemplate!(fun!double));
>>
>> Error: template instance getTemplate!(fun) does not match template
>> declaration getTemplate(alias T : TI!(TP), alias TI, TP...)
>>
>
> Oh, sorry. I had tested it with generic templates and assumed it would work with everything that's not a type. No ideas on how to make it work with function templates then.
>


there's also this case:
template E8(T){
struct B{}
struct A{}
}

pragma(msg,__LINE__,":",getTemplate!(E8!(float))); => works with template
getTemplate(alias T : TI!TP, alias TI, TP...) specialization

pragma(msg,__LINE__,":",getTemplate!(E8!(float).A)); =>  ??
how to make the 2nd work?

is there something like:
template getTemplate(alias T : TI!TP.TE, alias TI, alias TE, TP...) {...}
available ?

On Sunday, 23 June 2013 at 00:34:36 UTC, Timothee Cour wrote:
> there's also this case:
> template E8(T){
> struct B{}
> struct A{}
> }
>
> pragma(msg,__LINE__,":",getTemplate!(E8!(float))); => works with template
> getTemplate(alias T : TI!TP, alias TI, TP...) specialization
>
> pragma(msg,__LINE__,":",getTemplate!(E8!(float).A)); =>  ??
> how to make the 2nd work?
>
> is there something like:
> template getTemplate(alias T : TI!TP.TE, alias TI, alias TE, TP...) {...}
> available ?

E8!float.A itself is not a template instance, its parent is. I think it's correct for getTemplate to not compile in this case.

In the end, putting getTemplate!Foo and getTemplateArguments!Foo back together should lead to Foo again. I don't see what getTemplate!(E8!float.A) could return for that to hold.