| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03 |
| |
| // <string> |
| |
| // basic_string& operator=(basic_string&& c) |
| // noexcept( |
| // allocator_traits<allocator_type>::propagate_on_container_move_assignment::value || |
| // allocator_traits<allocator_type>::is_always_equal::value); // C++17 |
| // |
| // before C++17, we use the conforming extension |
| // noexcept( |
| // allocator_type::propagate_on_container_move_assignment::value && |
| // is_nothrow_move_assignable<allocator_type>::value); |
| |
| #include <string> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_allocator.h" |
| |
| template <class T> |
| struct some_alloc |
| { |
| typedef T value_type; |
| some_alloc(const some_alloc&); |
| T *allocate(size_t); |
| }; |
| |
| template <class T> |
| struct some_alloc2 |
| { |
| typedef T value_type; |
| |
| some_alloc2() {} |
| some_alloc2(const some_alloc2&); |
| T *allocate(size_t); |
| void deallocate(void*, unsigned) {} |
| |
| typedef std::false_type propagate_on_container_move_assignment; |
| typedef std::true_type is_always_equal; |
| }; |
| |
| template <class T> |
| struct some_alloc3 |
| { |
| typedef T value_type; |
| |
| some_alloc3() {} |
| some_alloc3(const some_alloc3&); |
| T *allocate(size_t); |
| void deallocate(void*, unsigned) {} |
| |
| typedef std::false_type propagate_on_container_move_assignment; |
| typedef std::false_type is_always_equal; |
| }; |
| |
| int main() |
| { |
| { |
| typedef std::string C; |
| static_assert(std::is_nothrow_move_assignable<C>::value, ""); |
| } |
| { |
| typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C; |
| static_assert(!std::is_nothrow_move_assignable<C>::value, ""); |
| } |
| { |
| typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C; |
| #if TEST_STD_VER > 14 |
| // if the allocators are always equal, then the move assignment can be noexcept |
| static_assert( std::is_nothrow_move_assignable<C>::value, ""); |
| #else |
| static_assert(!std::is_nothrow_move_assignable<C>::value, ""); |
| #endif |
| } |
| #if TEST_STD_VER > 14 |
| { |
| // POCMA is false, always equal |
| typedef std::basic_string<char, std::char_traits<char>, some_alloc2<char>> C; |
| static_assert( std::is_nothrow_move_assignable<C>::value, ""); |
| } |
| { |
| // POCMA is false, not always equal |
| typedef std::basic_string<char, std::char_traits<char>, some_alloc3<char>> C; |
| static_assert(!std::is_nothrow_move_assignable<C>::value, ""); |
| } |
| #endif |
| } |