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b32b8144 | 1 | // Copyright Louis Dionne 2013-2017 |
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2 | // Distributed under the Boost Software License, Version 1.0. |
3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
4 | ||
5 | #include <boost/hana/assert.hpp> | |
b32b8144 | 6 | #include <boost/hana/config.hpp> |
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7 | #include <boost/hana/first.hpp> |
8 | #include <boost/hana/pair.hpp> | |
9 | #include <boost/hana/second.hpp> | |
10 | namespace hana = boost::hana; | |
11 | ||
12 | ||
13 | constexpr auto in_constexpr_context(int a, short b) { | |
14 | hana::pair<int, short> p1(a, b); | |
15 | hana::pair<int, short> p2; | |
16 | hana::pair<double, long> p3; | |
17 | p2 = p1; | |
18 | p3 = p2; | |
19 | return p3; | |
20 | } | |
21 | ||
22 | int main() { | |
23 | { | |
24 | hana::pair<int, short> p1(3, 4); | |
25 | hana::pair<double, long> p2; | |
26 | p2 = p1; | |
27 | BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == 3); | |
28 | BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4); | |
29 | } | |
30 | ||
31 | // make sure that also works in a constexpr context | |
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32 | // (test fails under GCC <= 6 due to buggy constexpr) |
33 | #if BOOST_HANA_CONFIG_GCC >= BOOST_HANA_CONFIG_VERSION(7, 0, 0) | |
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34 | { |
35 | constexpr auto p = in_constexpr_context(3, 4); | |
36 | static_assert(hana::first(p) == 3, ""); | |
37 | static_assert(hana::second(p) == 4, ""); | |
38 | } | |
b32b8144 | 39 | #endif |
7c673cae | 40 | } |