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Make mp_at SFINAE-friendly

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Peter Dimov committed 2017-05-29 05:56:55 +03:00
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commit f6d92069a9
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test/mp_at_sf.cpp
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// Copyright 2015, 2017 Peter Dimov.
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/utility.hpp>
#include <boost/mp11/algorithm.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
using boost::mp11::mp_valid;
using boost::mp11::mp_at;
using boost::mp11::mp_size_t;
using boost::mp11::mp_list;
int main()
{
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at, void, mp_size_t<0>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at, mp_list<>, mp_size_t<0>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_at, mp_list<void>, mp_size_t<0>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at, mp_list<void>, mp_size_t<1>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_at, mp_list<void, void>, mp_size_t<0>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_at, mp_list<void, void>, mp_size_t<1>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_at, mp_list<void, void>, mp_size_t<2>>));
return boost::report_errors();
}