Re: DIP 88: Simple form of named parameters

[Bastiaan Veelo via Digitalmars-d]

On Friday, 27 May 2016 at 18:26:07 UTC, Vladimir Panteleev wrote:
https://github.com/CyberShadow/ae/blob/master/utils/meta/args.d
:D

Nice work! Is it intentional to require default parameters? I 
think you can change lines 34-36:

                foreach (i, arg; ParameterDefaults!fun)
                        static if (i >= posArgs.length)
                                args[i] = ParameterDefaults!fun[i];

into

                foreach (i, arg; ParameterDefaults!fun)
                        static if (i >= posArgs.length) {
                                static if (is(arg==void))
                                        args[i] = Parameters!fun[i].init;
                                else
                                        args[i] = arg;
                        }

That makes this work:

import ae.utils.meta.args;

void fun(int one, int two, double three, string four)
{
    import std.stdio;
    writeln("one=", one, "; two=", two, "; three=", three, "; 
four=", four);
}

void main(string[] a)
{
    args!(fun, four=>"4", two=>2, one=>a.length, three=>3.0);
}

By the way your unit tests don't really test that named arguments 
can be given in arbitrary order (although they can) as summation 
is communitative.

Bastiaan.