Does D support template template parameters? How would I get the following to work?
struct Type(alias a, alias b) { alias a A; alias b B; }
template MakeType(alias a, alias b)
{
alias Type!(a, b) MakeType;
}
template Foo(alias a, U) // where U is a Type
{
//...
}
template Foo(alias a, U : MakeType!(a, b), b...) // where U is a specialization
{
//...
}
and Foo
is supposed to be called as such:
alias MakeType!(5, 7) MyType;
alias Foo!(5, MyType) Fooed; // error
Error: template instance Foo!(5,Type!(5,7)) Foo!(5,Type!(5,7)) does not match template declaration Foo(alias a,U : MakeType!(a,b),b...)
I got it working :-)
template Foo(alias a, U) // where U is a Type
{
//...
}
template Foo(alias a, U : X, X) if(is(X == MakeType!(a, U.B)))
{
//...
}
and in usage:
alias MakeType!(1, 3) MyType1;
alias MakeType!(5, 7) MyType2;
Foo!(5, MyType1) // calls the first Foo()
Foo!(5, MyType2) // calls the second Foo() with specialization