callable_traits/test/detail/collapse_flags.cpp

/*
Copyright Barrett Adair 2016
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http ://boost.org/LICENSE_1_0.txt)
*/

#include <type_traits>
#include <callable_traits/detail/qualifiers.hpp>

#ifndef CT_ASSERT
#define CT_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
#endif //CT_ASSERT

using namespace callable_traits::detail;

int main() {

    // callable_traits::detail::collapse_flags emulates the
    // C++11 reference collapsing rules. Here, we test that
    //behavior.

    using rref_plus_lref = collapse_flags<rref_, lref_>;
    CT_ASSERT(rref_plus_lref::value == lref_);

    using lref_plus_rref = collapse_flags<lref_, rref_>;
    CT_ASSERT(lref_plus_rref::value == lref_);

    using lref_plus_lref = collapse_flags<lref_, lref_>;
    CT_ASSERT(lref_plus_lref::value == lref_);

    using rref_plus_rref = collapse_flags<rref_, rref_>;
    CT_ASSERT(rref_plus_rref::value == rref_);

    using const_plus_rref = collapse_flags<const_, rref_>;
    CT_ASSERT(const_plus_rref::value == (const_ | rref_));

    using const_plus_lref = collapse_flags<const_, lref_>;
    CT_ASSERT(const_plus_lref::value == (const_ | lref_));
}