41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/first.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/second.hpp>
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namespace hana = boost::hana;
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constexpr auto in_constexpr_context(int a, short b) {
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hana::pair<int, short> p1(a, b);
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hana::pair<int, short> p2;
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hana::pair<double, long> p3;
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p2 = p1;
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p3 = p2;
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return p3;
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}
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int main() {
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{
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hana::pair<int, short> p1(3, 4);
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hana::pair<double, long> p2;
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p2 = p1;
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BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == 3);
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BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
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}
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// make sure that also works in a constexpr context
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// (test fails under GCC <= 6 due to buggy constexpr)
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#if BOOST_HANA_CONFIG_GCC >= BOOST_HANA_CONFIG_VERSION(7, 0, 0)
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{
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constexpr auto p = in_constexpr_context(3, 4);
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static_assert(hana::first(p) == 3, "");
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static_assert(hana::second(p) == 4, "");
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}
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#endif
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}
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