99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// UNSUPPORTED: 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(int, char**)
|
|
{
|
|
{
|
|
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
|
|
|
|
return 0;
|
|
}
|