libstdc++-v3/testsuite/23_containers/unordered_map/allocator/noexcept.cc

   1 // Copyright (C) 2013-2024 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 // { dg-do compile { target c++11 } }
  19
  20 #include <unordered_map>
  21 #include <testsuite_allocator.h>
  22
  23 struct T { int i; };
  24
  25 struct hash
  26 {
  27   std::size_t operator()(const T t) const noexcept
  28   { return t.i; }
  29 };
  30
  31 struct equal_to
  32 {
  33   bool operator()(const T& lhs, const T& rhs) const noexcept
  34   { return lhs.i == rhs.i; }
  35 };
  36
  37 // Versions of the function objects without nothrow swap.
  38 struct hash_t : hash { };
  39 void swap(hash_t&, hash_t&) noexcept(false) { }
  40 struct equal_to_t : equal_to { };
  41 void swap(equal_to_t&, equal_to_t&) noexcept(false) { }
  42
  43 using __gnu_test::propagating_allocator;
  44
  45 void test01()
  46 {
  47   typedef std::allocator<std::pair<const T, T>> alloc_type;
  48   typedef std::unordered_map<T, T, hash, equal_to, alloc_type> test_type;
  49   test_type v1;
  50   test_type v2;
  51   // this is a GNU extension for std::allocator
  52   static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  53   static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
  54 }
  55
  56 void test02()
  57 {
  58   typedef std::allocator<std::pair<const T, T>> alloc_type;
  59   typedef std::unordered_map<T, T, hash_t, equal_to, alloc_type> test_type;
  60   test_type v1;
  61   test_type v2;
  62   static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  63   static_assert( !noexcept( v1.swap(v2) ), "Swap can throw" );
  64 }
  65
  66 void test03()
  67 {
  68   typedef std::allocator<std::pair<const T, T>> alloc_type;
  69   typedef std::unordered_map<T, T, hash, equal_to_t, alloc_type> test_type;
  70   test_type v1;
  71   test_type v2;
  72   static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  73   static_assert( !noexcept( v1.swap(v2) ), "Swap can throw" );
  74 }
  75
  76 void test04()
  77 {
  78   typedef propagating_allocator<std::pair<const T, T>, false> alloc_type;
  79   typedef std::unordered_map<T, T, hash, equal_to, alloc_type> test_type;
  80   test_type v1(alloc_type(1));
  81   test_type v2(alloc_type(2));
  82   static_assert( !noexcept( v1 = std::move(v2) ), "Move assign can throw" );
  83   static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
  84 }
  85
  86 void test05()
  87 {
  88   typedef propagating_allocator<std::pair<const T, T>, true> alloc_type;
  89   typedef std::unordered_map<T, T, hash, equal_to, alloc_type> test_type;
  90   test_type v1(alloc_type(1));
  91   test_type v2(alloc_type(2));
  92   static_assert( noexcept( v1 = std::move(v2) ), "Move assign cannot throw" );
  93   static_assert( noexcept( v1.swap(v2) ), "Swap cannot throw" );
  94 }
  95
  96 void test06()
  97 {
  98   typedef std::unordered_map<int, int> test_type;
  99   static_assert( noexcept( test_type() ), "Default constructor does not throw" );
 100   static_assert( noexcept( test_type(test_type()) ), "Move constructor does not throw" );
 101 }