Arty of Constructor

[John Colvin via Digitalmars-d-learn]

On Thursday, 19 November 2015 at 06:20:28 UTC, Andrew wrote:
> The documentation gives plenty of examples of how to use a 
> static if with the arity trait, but how do I specify the 
> constructor of an object as the parameter to arity?
>
> Thanks

Ugly but works:

import std.traits;

struct A
{
	this(int a, int b){}
}

pragma(msg, arity!(A.__ctor)); // prints 2

You may have to experiment with __traits(getOverloads, ...) if 
you have multiple constructors and want to look at all of them.