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// Copyright 2023 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/integral.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <tuple>
using boost::mp11::mp_size_t;
struct Q
{
template<class N, class T> using fn = mp_size_t<N::value + sizeof(T)>;
};
int main()
{
using boost::mp11::mp_valid;
using boost::mp11::mp_fold_q;
using boost::mp11::mp_list;
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_fold_q, mp_list<>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_fold_q, mp_list<int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_fold_q, mp_list<int, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_fold_q, mp_list<int, int, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_fold_q, mp_list<int, int, int, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<void>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<int, void>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<int, int, void>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<int, int, int, void>, mp_size_t<0>, Q>));
#if !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1910 )
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<void, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<void, int, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<void, int, int, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<int, void, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<int, void, int, int>, mp_size_t<0>, Q>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_fold_q, mp_list<int, int, void, int>, mp_size_t<0>, Q>));
#endif
return boost::report_errors();
}
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