libs/hana/test/ext/std/pair/first_second.cpp

   1 // Copyright Louis Dionne 2013-2017
   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>
   6 #include <boost/hana/equal.hpp>
   7 #include <boost/hana/ext/std/pair.hpp>
   8 #include <boost/hana/first.hpp>
   9 #include <boost/hana/second.hpp>
  10
  11 #include <laws/base.hpp>
  12
  13 #include <utility>
  14 namespace hana = boost::hana;
  15 using hana::test::ct_eq;
  16
  17
  18 int main() {
  19     // first
  20     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  21         hana::first(std::make_pair(ct_eq<0>{}, ct_eq<1>{})),
  22         ct_eq<0>{}
  23     ));
  24
  25     // second
  26     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  27         hana::second(std::make_pair(ct_eq<0>{}, ct_eq<1>{})),
  28         ct_eq<1>{}
  29     ));
  30 }