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#define MIXIN_TRAIT_TESTS
#ifdef MIXIN_TRAIT_TESTS
# include "mixin-traits.hpp"
// the `impl' class provides a cast template through the CRTP pattern.
// mixins don't do direct inheritance on themselves,
// that's what mixin_traits::depends is for.
namespace mixins::traits_detail {
struct A {};
struct B {};
struct C {};
struct D {};
template<> struct mixin_traits<A>
{
using depends = tuple<>;
};
template<> struct mixin_traits<B>
{
using depends = tuple<A>;
};
template<> struct mixin_traits<C>
{
using depends = tuple<A>;
};
template<> struct mixin_traits<D>
{
using depends = tuple<C>;
};
extern void test1();
void test1()
{
struct U : B, A {};
struct V : D {};
struct W : C, A {};
struct Q : virtual W, virtual D {};
//#define SHOULD_NOT_COMPILE
#ifdef SHOULD_NOT_COMPILE
(void)impl<Q, W>{}; // W not a mixin
(void)impl<V, A>{}; // A
(void)impl<V, D>{}; // D => C => A
(void)impl<V, D>{}; // D => C => A
(void)impl<W, C, B>{}; // B
#else
(void)impl<U, B>{};
(void)impl<W, C>{};
(void)impl<Q, D, A>{};
#endif
}
} // ns mixins::traits_detail
#endif
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