Converting a number to complex

[Joshua Niehus]

On Friday, 23 November 2012 at 16:11:25 UTC, Joshua Niehus wrote:
> A bit messy, but im sure there is some room for cleanup 
> somewhere...

Errata... (what i get for copy/pasting)

import std.stdio, std.conv, std.traits, std.complex;
template isComplexNumeric(T)
{
     static if(isNumeric!T) {
         enum bool isComplexNumeric = true;
     }
     else static if (is(T == Complex!double))
     {
         enum bool isComplexNumeric = true;
     }
     else {
         enum bool isComplexNumeric = false;
     }
}

class Example(T) if (isComplexNumeric!T)
{
     T k = to!T(1);
}

void main()
{
     auto x = new Example!(Complex!double)();
     writeln(x.k);
     auto y = new Example!double();
     writeln(y.k);
     auto z = new Example!string();
     writeln(z.k);
}

i did have to reference Philippe Sigaud's excellent book on 
Templates several times:
https://github.com/PhilippeSigaud/D-templates-tutorial/blob/master/dtemplates.pdf