I'm instantiating a couple of template structs that conflict with each other. I'd like them to be unique types, automatically. So I tried this:

template Foo (string unique_id = __FILE__~__LINE__.to!string)
{...}

but it didn't work. When I use this for templated functions, I get the file and line number where the function is instantiated. But in this case, I got the file and line number where the template was defined.

Is there anything I can do to make sure each instantiated type is unique?

On 6/19/14, 1:48 AM, Vlad Levenfeld wrote:
> I'm instantiating a couple of template structs that conflict with each
> other. I'd like them to be unique types, automatically. So I tried this:
>
> template Foo (string unique_id = __FILE__~__LINE__.to!string)
> {...}
>
> but it didn't work. When I use this for templated functions, I get the
> file and line number where the function is instantiated. But in this
> case, I got the file and line number where the template was defined.
>
> Is there anything I can do to make sure each instantiated type is unique?

I don't think you want to set a default value. If you pass "__FILE__~__LINE__.to!string" during instantiation, it works every time:

template Foo(string uniqueId)
{
	alias Foo = uniqueId;
}

void main()
{
	Foo!(__FILE__~__LINE__.to!string).writeln;
}

On Thursday, 19 June 2014 at 05:48:24 UTC, Vlad Levenfeld wrote:
> I'm instantiating a couple of template structs that conflict with each other. I'd like them to be unique types, automatically. So I tried this:
>
> template Foo (string unique_id = __FILE__~__LINE__.to!string)
> {...}
>
> but it didn't work. When I use this for templated functions, I get the file and line number where the function is instantiated. But in this case, I got the file and line number where the template was defined.
>
> Is there anything I can do to make sure each instantiated type is unique?

Maybe something like this:
http://dpaste.dzfl.pl/ce479a2f87f4

On Thursday, 19 June 2014 at 07:26:12 UTC, Andrea Fontana wrote:
> On Thursday, 19 June 2014 at 05:48:24 UTC, Vlad Levenfeld wrote:
>> I'm instantiating a couple of template structs that conflict with each other. I'd like them to be unique types, automatically. So I tried this:
>>
>> template Foo (string unique_id = __FILE__~__LINE__.to!string)
>> {...}
>>
>> but it didn't work. When I use this for templated functions, I get the file and line number where the function is instantiated. But in this case, I got the file and line number where the template was defined.
>>
>> Is there anything I can do to make sure each instantiated type is unique?
>
> Maybe something like this:
> http://dpaste.dzfl.pl/ce479a2f87f4

Of course Foo2 could be an enum :)

Thanks! Mixin strings can punch through anything.