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SFINAE-fail mp_transform on lists of different sizes

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Peter Dimov
2017-05-18 16:13:55 +03:00
parent 611ea810bd
commit 02385ac83d
3 changed files with 64 additions and 6 deletions
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42
test/mp_transform_sf.cpp Normal file
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// Copyright 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/algorithm.hpp>
#include <boost/mp11/utility.hpp>
#include <boost/mp11/list.hpp>
#include <boost/core/lightweight_test_trait.hpp>
using boost::mp11::mp_transform;
using boost::mp11::mp_list;
using boost::mp11::mp_valid;
template<class...> using F = void;
template<class... L> using transform = mp_transform<F, L...>;
int main()
{
BOOST_TEST_TRAIT_FALSE((mp_valid<transform>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void, void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, void, void, void, void, void>));
#if !BOOST_WORKAROUND( BOOST_MSVC, <= 1800 )
BOOST_TEST_TRAIT_TRUE((mp_valid<transform, mp_list<>>));
#endif
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<>, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<>, mp_list<>, mp_list<void>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<transform, mp_list<>, mp_list<>, mp_list<>, mp_list<>, mp_list<void>>));
return boost::report_errors();
}