12345678910111213141516171819202122232425262728293031323334353637383940 |
- // Copyright Louis Dionne 2013-2017
- // 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 <boost/hana/assert.hpp>
- #include <boost/hana/config.hpp>
- #include <boost/hana/first.hpp>
- #include <boost/hana/pair.hpp>
- #include <boost/hana/second.hpp>
- namespace hana = boost::hana;
- constexpr auto in_constexpr_context(int a, short b) {
- hana::pair<int, short> p1(a, b);
- hana::pair<int, short> p2;
- hana::pair<double, long> p3;
- p2 = p1;
- p3 = p2;
- return p3;
- }
- int main() {
- {
- hana::pair<int, short> p1(3, 4);
- hana::pair<double, long> p2;
- p2 = p1;
- BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == 3);
- BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
- }
- // make sure that also works in a constexpr context
- // (test fails under GCC <= 6 due to buggy constexpr)
- #if BOOST_HANA_CONFIG_GCC >= BOOST_HANA_CONFIG_VERSION(7, 0, 0)
- {
- constexpr auto p = in_constexpr_context(3, 4);
- static_assert(hana::first(p) == 3, "");
- static_assert(hana::second(p) == 4, "");
- }
- #endif
- }
|