On Friday, 7 August 2015 at 11:45:22 UTC, Nordlöw wrote:
Can somebody please explain and help out with variadic version
of `isInstanceOf`?
Here's a step forward:
/**
Returns true if $(D T) is an instance of the template $(D T)
with template
parameters $(D Ps).
*/
enum bool isInstanceOf(alias S, T, Ps...) = is(T == S!Ps);
///
unittest
{
struct SortedRange(Range, alias pred = "a < b")
{
}
alias R = int[];
alias SR = SortedRange!(R, "a < b");
static assert(isInstanceOf!(SortedRange, SR, R, "a < b"));
}
1.
This, however, requires *all* the template parameters to be
given. What I need now is a syntax to check that, in this case,
*only* the second template argument `pred` matches. How do I do
that?
2.
Note also that this solution doesn't understand that "a<b" and "a
< b" are semantically equivalent. Forcing usage of `binaryFun` is
a temporary solution. Is there a better solution?
