libs/histogram/test/detail_compressed_pair_test.cpp

   1 // Copyright 2019 Hans Dembinski
   2 //
   3 // Distributed under the Boost Software License, Version 1.0.
   4 // (See accompanying file LICENSE_1_0.txt
   5 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <boost/core/lightweight_test.hpp>
   8 #include <boost/core/lightweight_test_trait.hpp>
   9 #include <boost/histogram/detail/compressed_pair.hpp>
  10 #include "std_ostream.hpp"
  11
  12 using namespace boost::histogram::detail;
  13
  14 struct nothrow_move {
  15   nothrow_move(nothrow_move&&) noexcept {}
  16   nothrow_move& operator=(nothrow_move&&) noexcept { return *this; }
  17 };
  18
  19 struct throw_move {
  20   throw_move(throw_move&&) {}
  21   throw_move& operator=(throw_move&&) { return *this; }
  22 };
  23
  24 int main() {
  25   BOOST_TEST_TRAIT_TRUE(
  26       (std::is_nothrow_move_constructible<compressed_pair<nothrow_move, nothrow_move> >));
  27
  28   BOOST_TEST_TRAIT_FALSE(
  29       (std::is_nothrow_move_constructible<compressed_pair<nothrow_move, throw_move> >));
  30
  31   BOOST_TEST_TRAIT_FALSE(
  32       (std::is_nothrow_move_constructible<compressed_pair<throw_move, nothrow_move> >));
  33
  34   BOOST_TEST_TRAIT_FALSE(
  35       (std::is_nothrow_move_constructible<compressed_pair<throw_move, throw_move> >));
  36
  37   BOOST_TEST_GE(sizeof(compressed_pair<int, char>), sizeof(int) + sizeof(char));
  38   BOOST_TEST_EQ(sizeof(compressed_pair<int, nothrow_move>), sizeof(int));
  39   BOOST_TEST_EQ(sizeof(compressed_pair<int, throw_move>), sizeof(int));
  40
  41   return boost::report_errors();
  42 }