std::pmr::operator==, std::pmr::operator!=

 

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智能指针 unique_ptr (C++11) shared_ptr (C++11) weak_ptr (C++11) auto_ptr (C++17 前) owner_less (C++11) enable_shared_from_this (C++11) bad_weak_ptr (C++11) default_delete (C++11) out_ptr_t (C++23) inout_ptr_t (C++23) 分配器 allocator allocator_traits (C++11) allocation_result (C++23) allocate_at_least (C++23) allocator_arg_t (C++11) allocator_arg (C++11) uses_allocator (C++11) uses_allocator_construction_args (C++20) make_obj_using_allocator (C++20) uninitialized_construct_using_allocator (C++20) scoped_allocator_adaptor (C++11) pmr::polymorphic_allocator (C++17) 内存资源 pmr::memory_resource (C++17) pmr::get_default_resource (C++17) pmr::set_default_resource (C++17) pmr::new_delete_resource (C++17) pmr::null_memory_resource (C++17) pmr::synchronized_pool_resource (C++17) pmr::unsynchronized_pool_resource (C++17) pmr::monotonic_buffer_resource (C++17) pmr::pool_options (C++17) 未初始化存储 raw_storage_iterator (C++20 前) get_temporary_buffer (C++20 前) return_temporary_buffer (C++20 前)

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std::pmr::polymorphic_allocator

成员函数

polymorphic_allocator::polymorphic_allocator

polymorphic_allocator::allocate

polymorphic_allocator::deallocate

polymorphic_allocator::construct

polymorphic_allocator::destroy (C++20 中弃用)

polymorphic_allocator::allocate_bytes (C++20)

polymorphic_allocator::deallocate_bytes (C++20)

polymorphic_allocator::allocate_object (C++20)

polymorphic_allocator::deallocate_object (C++20)

polymorphic_allocator::new_object (C++20)

polymorphic_allocator::delete_object (C++20)

polymorphic_allocator::select_on_container_copy_construction

polymorphic_allocator::resource

非成员函数

operator==operator!= (C++20 前)

 

在标头 <memory_resource> 定义
template< class T1, class T2 > bool operator==( const std::pmr::polymorphic_allocator<T1>& lhs,                  const std::pmr::polymorphic_allocator<T2>& rhs ) noexcept;	(1)	(C++17 起)
friend bool operator==( const polymorphic_allocator& lhs,                         const polymorphic_allocator& rhs ) noexcept;	(2)	(C++17 起)
template< class T1, class T2 > bool operator!=( const std::pmr::polymorphic_allocator<T1>& lhs,                  const std::pmr::polymorphic_allocator<T2>& rhs ) noexcept;	(3)	(C++17 起) (C++20 前)
friend bool operator!=( const polymorphic_allocator& lhs,                         const polymorphic_allocator& rhs ) noexcept;	(4)	(C++17 起) (C++20 前)

比较二个 polymorphic_allocator 。若二个 polymorphic_allocator 的底层 memory_resource 比较相等，则它们比较相等。

1) 返回 *lhs.resource() == *rhs.resource()

2) 同 (1) ，允许到 polymorphic_allocator 的转换。
此函数对通常无限定或有限定查找不可见，而只能在 std::pmr::polymorphic_allocator 为参数的关联类时由实参依赖查找找到。

3) 返回 !(lhs == rhs)

4) 同 (3) ，允许到 polymorphic_allocator 的转换。
此函数对通常无限定或有限定查找不可见，而只能在 std::pmr::polymorphic_allocator 为参数的关联类时由实参依赖查找找到。

!= 运算符从 operator== 合成。

(C++20 起)

参数

lhs, rhs

-

要比较的 polymorphic_allocator

返回值

1-2) *lhs.resource() == *rhs.resource()

3-4) !(lhs == rhs)

缺陷报告

下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。

缺陷报告	应用于	出版时的行为	正确行为
LWG 3683	C++17	polymorphic_allocator 不能与能转换到它的类型比较	添加了重载