On Tuesday, 11 November 2014 at 15:53:37 UTC, Marc Schütz wrote:
Don't know whether it's documented, but it's a consequence of
using string mixins.
unaryFun (which is used internally by map) is implemented this
way:
auto unaryFun(ElementType)(auto ref ElementType __a)
{
mixin("alias " ~ parmName ~ " = __a ;");
return mixin(fun);
}
where `fun` is `Foo(a)`. Of course, `Foo` is not visible in
std.functional. When you pass in a symbol, the lookup work
because it takes place at the point of instantiation.
That makes sense, thanks.
