mirror of
https://github.com/boostorg/hana.git
synced 2026-01-21 17:02:25 +00:00
37 lines
997 B
C++
37 lines
997 B
C++
// Copyright Louis Dionne 2013-2016
|
|
// 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/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
|
|
{
|
|
constexpr auto p = in_constexpr_context(3, 4);
|
|
static_assert(hana::first(p) == 3, "");
|
|
static_assert(hana::second(p) == 4, "");
|
|
}
|
|
}
|