I have a template used for storing compile-time values:
template Def(int x, string y) {
alias impl = TypeTuple!(x,y);
}
How do I define a template isDef that, given some template alias A,
evaluates to true if A is some instantiation of Def?
template isDef(alias A) {
enum A = ... /* what to put here? */
}
The intent is to be able to write signature constraints like this:
auto myFunc(alias def)(...)
if (isDef!def)
{
...
}
...
// Pass an instantiation of Def to myFunc
auto x = myFunc!(Def!(1, "abc"))(args);
I tried using std.traits.isInstanceOf but apparently it expects the
second argument to be an actual type, which doesn't work in this case
because Def is a typetuple of compile-time values, not an actual type.
T
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