http://d.puremagic.com/issues/show_bug.cgi?id=6394

           Summary: template type constraints embedded in the function
                    parameters.
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: gor@boloneum.com


--- Comment #0 from Gor Gyolchanyan <gor@boloneum.com> 2011-07-28 08:43:43 PDT ---


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http://d.puremagic.com/issues/show_bug.cgi?id=6394



--- Comment #1 from Gor Gyolchanyan <gor@boloneum.com> 2011-07-28 08:49:18 PDT ---
Given the code:

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

template SomeStruct(Type)
{
    static if(is(Type == struct) || is(Type == class) || is(Type == interface))
        enum StaticStruct = true;
    else
        enum StaticStruct = false;
}

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

I suggest a syntax sugar for template functions:

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

void f(SomeStruct s)
{
}

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

be transformed into:

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

void f(Type_0_)(Type_0_ s)
    if(SomeStruct!Type_0_)
{
}

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

IF the given type isn't a valid type, it'll search for a template, that takes a single type and evaluates to a bool and transform the function if the type name is such a template.

this would greatly increase the readability of generic functions and allow to avoid creating enormous template constraints, as well as provide a better diagnostics, like "the type T is not a SomeStruct" or something like that.

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