aliases and templates
ws
wisiong at gmail.com
Fri Jan 23 02:12:14 PST 2009
Trass3r Wrote:
> I already read about "Implicit Template Properties":
> If a template has exactly one member in it, and the name of that member
> is the same as the template name, that member is assumed to be referred
> to in a template instantiation
>
> I guess the following is something similar, but why are aliases used here?
>
> template ParameterTypeTuple(dg)
> {
> static if (is(dg P == function))
> alias P ParameterTypeTuple;
> else static if (is(dg P == delegate))
> alias ParameterTypeTuple!(P) ParameterTypeTuple;
> else static if (is(dg P == P*))
> alias ParameterTypeTuple!(P) ParameterTypeTuple;
> else
> static assert(0, "argument has no parameters");
> }
Without the alias you will be declaring a variable.
With it you are aliasing a type.
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