#include <Concepts.h>
Concepts let you construct a 'template' of one arg from one with two args, but class, and variable templates don't allow this; but this magic trick of double indirection does allow it. And cannot use concepts as template arguments to another template sadly, so need this trick...
The 'test' here just invokes constructible_from<TEST_ARGUMENT, T>
Definition at line 344 of file Concepts.h.