ceph/src/boost/libs/mp11/test/mp_for_each.cpp

   1
   2 //  Copyright 2017 Peter Dimov.
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 //
   6 // See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt
   8
   9
  10 #include <boost/mp11/algorithm.hpp>
  11 #include <boost/mp11/list.hpp>
  12 #include <boost/core/lightweight_test.hpp>
  13 #include <boost/config.hpp>
  14 #include <boost/detail/workaround.hpp>
  15 #include <tuple>
  16
  17 #if !defined( BOOST_NO_CXX14_CONSTEXPR )
  18 # define CONSTEXPR14 constexpr
  19 #else
  20 # define CONSTEXPR14
  21 #endif
  22
  23 struct F
  24 {
  25     int s;
  26
  27     CONSTEXPR14 void operator()( int ) { s = s * 10 + 1; }
  28     CONSTEXPR14 void operator()( short ) { s = s * 10 + 2; }
  29     CONSTEXPR14 void operator()( char ) { s = s * 10 + 3; }
  30 };
  31
  32 using boost::mp11::mp_list;
  33 using boost::mp11::mp_for_each;
  34
  35 int main()
  36 {
  37     BOOST_TEST_EQ( (mp_for_each<mp_list<>>( 11 )), 11 );
  38     BOOST_TEST_EQ( (mp_for_each<mp_list<int>>( F{0} ).s), 1 );
  39     BOOST_TEST_EQ( (mp_for_each<mp_list<int, short>>( F{0} ).s), 12 );
  40     BOOST_TEST_EQ( (mp_for_each<mp_list<int, short, char>>( F{0} ).s), 123 );
  41
  42     BOOST_TEST_EQ( (mp_for_each<std::tuple<>>( 11 )), 11 );
  43     BOOST_TEST_EQ( (mp_for_each<std::tuple<int>>( F{0} ).s), 1 );
  44     BOOST_TEST_EQ( (mp_for_each<std::tuple<int, short>>( F{0} ).s), 12 );
  45     BOOST_TEST_EQ( (mp_for_each<std::tuple<int, short, char>>( F{0} ).s), 123 );
  46
  47     BOOST_TEST_EQ( (mp_for_each<std::pair<int, short>>( F{0} ).s), 12 );
  48
  49 #if defined( BOOST_NO_CXX11_CONSTEXPR ) || ( defined( _LIBCPP_VERSION ) && __cplusplus < 201400L )
  50 #else
  51
  52     static_assert( mp_for_each<mp_list<>>( 11 ) == 11, "mp_for_each<mp_list<>>( 11 ) == 11" );
  53     static_assert( mp_for_each<std::tuple<>>( 12 ) == 12, "mp_for_each<std::tuple<>>( 12 ) == 12" );
  54
  55 #endif
  56
  57 #if !defined( BOOST_NO_CXX14_CONSTEXPR ) && !BOOST_WORKAROUND( BOOST_MSVC, < 1920 )
  58
  59     constexpr auto r1 = mp_for_each<mp_list<int, short, char>>( F{0} );
  60     static_assert( r1.s == 123, "r1.s == 123" );
  61
  62     constexpr auto r2 = mp_for_each<std::tuple<int, short, char>>( F{0} );
  63     static_assert( r2.s == 123, "r2.s == 123" );
  64
  65     constexpr auto r3 = mp_for_each<std::pair<int, short>>( F{0} );
  66     static_assert( r3.s == 12, "r3.s == 12" );
  67
  68 #endif
  69
  70     return boost::report_errors();
  71 }