libstdc++-v3/testsuite/20_util/pair/87822.cc

   1 // Copyright (C) 2018-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 #include <utility>
  19 #include <testsuite_hooks.h>
  20
  21 void
  22 test01()
  23 {
  24   std::pair<std::pair<int, int>, int> p;
  25 #if __cplusplus >= 201103L
  26   static_assert(sizeof(p) == (3 * sizeof(int)), "PR libstdc++/87822");
  27 #endif
  28   VERIFY( (void*)&p == (void*)&p.first );
  29   VERIFY( (void*)&p == (void*)&p.first.first );
  30 }
  31
  32 struct empty { };
  33
  34 void
  35 test02()
  36 {
  37   std::pair<std::pair<empty, empty>, empty> p;
  38 #if __cplusplus >= 201103L
  39   static_assert(sizeof(p) == (3 * sizeof(empty)), "PR libstdc++/87822");
  40 #endif
  41   VERIFY( (void*)&p == (void*)&p.first );
  42 }
  43
  44 void
  45 test03()
  46 {
  47   typedef std::pair<int, int> int_pair;
  48   typedef std::pair<int_pair, int_pair> int_pair_pair;
  49   std::pair<int_pair_pair, int_pair_pair> p;
  50 #if __cplusplus >= 201103L
  51   static_assert(sizeof(int_pair_pair) == (2 * sizeof(int_pair)), "nested");
  52   static_assert(sizeof(p) == (2 * sizeof(int_pair_pair)), "nested again");
  53 #endif
  54   VERIFY( (void*)&p == (void*)&p.first );
  55   VERIFY( (void*)&p == (void*)&p.first.first );
  56   VERIFY( (void*)&p == (void*)&p.first.first.first );
  57 }
  58
  59 int main()
  60 {
  61   test01();
  62   test02();
  63   test03();
  64 }