af961ed8cf
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@245330 91177308-0d34-0410-b5e6-96231b3b80d8
96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <string>
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// basic_string& operator=(basic_string&& c)
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// noexcept(
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// allocator_traits<allocator_type>::propagate_on_container_move_assignment::value ||
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// allocator_traits<allocator_type>::is_always_equal::value); // C++17
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//
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// before C++17, we use the conforming extension
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// noexcept(
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// allocator_type::propagate_on_container_move_assignment::value &&
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// is_nothrow_move_assignable<allocator_type>::value);
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#include "test_allocator.h"
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template <class T>
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struct some_alloc
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{
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typedef T value_type;
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some_alloc(const some_alloc&);
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};
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template <class T>
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struct some_alloc2
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{
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typedef T value_type;
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some_alloc2() {}
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some_alloc2(const some_alloc2&);
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void deallocate(void*, unsigned) {}
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typedef std::false_type propagate_on_container_move_assignment;
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typedef std::true_type is_always_equal;
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};
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template <class T>
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struct some_alloc3
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{
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typedef T value_type;
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some_alloc3() {}
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some_alloc3(const some_alloc3&);
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void deallocate(void*, unsigned) {}
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typedef std::false_type propagate_on_container_move_assignment;
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typedef std::false_type is_always_equal;
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};
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int main()
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{
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#if __has_feature(cxx_noexcept)
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{
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typedef std::string C;
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static_assert(std::is_nothrow_move_assignable<C>::value, "");
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}
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{
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typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C;
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static_assert(!std::is_nothrow_move_assignable<C>::value, "");
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}
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{
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typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C;
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#if TEST_STD_VER > 14
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// if the allocators are always equal, then the move assignment can be noexcept
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static_assert( std::is_nothrow_move_assignable<C>::value, "");
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#else
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static_assert(!std::is_nothrow_move_assignable<C>::value, "");
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#endif
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}
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#if TEST_STD_VER > 14
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{
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// POCMA is false, always equal
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typedef std::basic_string<char, std::char_traits<char>, some_alloc2<char>> C;
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static_assert( std::is_nothrow_move_assignable<C>::value, "");
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}
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{
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// POCMA is false, not always equal
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typedef std::basic_string<char, std::char_traits<char>, some_alloc3<char>> C;
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static_assert(!std::is_nothrow_move_assignable<C>::value, "");
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}
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#endif
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#endif
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}
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