libstdc++-v3/testsuite/21_strings/basic_string/allocator/wchar_t/noexcept.cc

   1 // Copyright (C) 2015-2021 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 // { dg-do compile { target c++11 } }
  19 // COW strings don't support C++11 allocator propagation:
  20 // { dg-require-effective-target cxx11-abi }
  21
  22 #include <string>
  23 #include <testsuite_allocator.h>
  24
  25 using C = wchar_t;
  26 const C c = L'a';
  27 using traits = std::char_traits<C>;
  28
  29 using __gnu_test::propagating_allocator;
  30
  31 void test01()
  32 {
  33   typedef std::allocator<C> alloc_type;
  34   typedef std::basic_string<C, traits, alloc_type> test_type;
  35   test_type v1;
  36   test_type v2;
  37   // this is a GNU extension for std::allocator
  38   static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  39   static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
  40 }
  41
  42 void test02()
  43 {
  44   typedef propagating_allocator<C, false> alloc_type;
  45   typedef std::basic_string<C, traits, alloc_type> test_type;
  46   test_type v1(alloc_type(1));
  47   test_type v2(alloc_type(2));
  48   static_assert( !noexcept( v1 = std::move(v2) ), "Move assign can throw" );
  49   static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
  50 }
  51
  52 void test03()
  53 {
  54   typedef propagating_allocator<C, true> alloc_type;
  55   typedef std::basic_string<C, traits, alloc_type> test_type;
  56   test_type v1(alloc_type(1));
  57   test_type v2(alloc_type(2));
  58   static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  59   static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
  60 }