libstdc++-v3/testsuite/20_util/integer_sequence/requirements/typedefs.cc

   1 // { dg-do compile { target c++14 } }
   2 //
   3 // Copyright (C) 2013-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <utility>
  21 #include <type_traits>
  22
  23 using std::is_same;
  24 using std::integer_sequence;
  25 using std::make_integer_sequence;
  26 using std::index_sequence;
  27 using std::make_index_sequence;
  28 using std::index_sequence_for;
  29
  30 static_assert( is_same<integer_sequence<int>::value_type, int>::value,
  31                "int value_type");
  32
  33 static_assert( is_same<integer_sequence<short>::value_type, short>::value,
  34                "short value_type");
  35
  36 static_assert( is_same<make_integer_sequence<int, 0>,
  37                        integer_sequence<int>>::value,
  38                "make empty int seq" );
  39
  40 static_assert( is_same<make_integer_sequence<int, 2>,
  41                        integer_sequence<int, 0, 1>>::value,
  42                "make non-empty int seq" );
  43
  44 static_assert( is_same<make_integer_sequence<unsigned, 0>,
  45                        integer_sequence<unsigned>>::value,
  46                "make empty unsigned seq" );
  47
  48 static_assert( is_same<make_integer_sequence<unsigned, 2>,
  49                        integer_sequence<unsigned, 0, 1>>::value,
  50                "make non-empty unsigned seq" );
  51
  52 static_assert( is_same<index_sequence<0, 1>,
  53                        integer_sequence<std::size_t, 0, 1>>::value,
  54                "index seq" );
  55
  56 static_assert( is_same<make_index_sequence<2>, index_sequence<0, 1>>::value,
  57                "make index seq" );
  58
  59 static_assert( is_same<index_sequence_for<char, int, void, double>,
  60                        index_sequence<0, 1, 2, 3>>::value,
  61                "index_sequence_for" );