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digitalmars.D.bugs - [Issue 5175] New: Add a way to get parameter names to std.traits

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5175

           Summary: Add a way to get parameter names to std.traits
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: jmdavisProg gmx.com



PDT ---
You can use std.traits.ParameterTypeTuple!() to get the types of the parameters
to a function, but there is not currently a way to get the names of the
parameters. Apparently, this would be useful for creating bindings with other
programming languages, so it should be added. It's discussed in this question
on stackoverflow: http://is.gd/gLeNf

So, we should have something like std.traits.ParameterNameTuple!() which gives
the names of a function's parameters.

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parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5175


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich gmail.com



19:37:08 PST ---
Well there is now __parameters, but this gives out both the types, param names,
and default values:

void test(int x, int y = 1) { }

template ParameterTuple(alias func)
{
    static if(is(typeof(func) P == __parameters))
        alias P ParameterTuple;
    else
        static assert(0);
}

void main()
{
    pragma(msg, ParameterTuple!test);
}


 (int x, int y = 1)


I would personally like to wrap ParameterTypeTuple, ParameterStorageClassTuple,
and provide a single GetParameters template which would return a tuple of these
struct objects:

struct Parameter(Type, alias DefVal)
{
    ParameterStorageClass stc;
    Type type;
    string name;
    alias DefVal defaultValue;
}

It's questionable how doable this is but it would make the API easier to use.

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Jan 22 2013