std::scoped_allocator_adaptor<OuterAlloc,InnerAlloc...>:: scoped_allocator_adaptor

 

C++

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自立实现与有宿主实现

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具名要求

功能特性测试宏 (C++20)

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元编程库 (C++11)

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技术规范

符号索引

外部库

 

动态内存管理

未初始化内存算法 uninitialized_copy uninitialized_fill uninitialized_move (C++17) uninitialized_default_construct (C++17) uninitialized_value_construct (C++17) destroy (C++17) destroy_at (C++17) voidify (C++20) uninitialized_copy_n (C++11) uninitialized_fill_n uninitialized_move_n (C++17) uninitialized_default_construct_n (C++17) uninitialized_value_construct_n (C++17) destroy_n (C++17) construct_at (C++20) 受约束的未初始化内存算法 ranges::uninitialized_copy (C++20) ranges::uninitialized_fill (C++20) ranges::uninitialized_move (C++20) ranges::construct_at (C++20) ranges::destroy (C++20) ranges::destroy_n (C++20) ranges::destroy_at (C++20) ranges::uninitialized_copy_n (C++20) ranges::uninitialized_fill_n (C++20) ranges::uninitialized_move_n (C++20) ranges::uninitialized_default_construct (C++20) ranges::uninitialized_value_construct (C++20) ranges::uninitialized_default_construct_n (C++20)   ranges::uninitialized_value_construct_n (C++20) 分配器 allocator allocator_traits (C++11) allocation_result (C++23) 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) 垃圾收集支持 declare_reachable (C++11)(C++23 前) undeclare_reachable (C++11)(C++23 前) declare_no_pointers (C++11)(C++23 前) undeclare_no_pointers (C++11)(C++23 前) pointer_safety (C++11)(C++23 前) get_pointer_safety (C++11)(C++23 前) 未初始化存储 raw_storage_iterator (C++20 前*) get_temporary_buffer (C++20 前*) return_temporary_buffer (C++20 前*) 显式生存期管理 start_lifetime_asstart_lifetime_as_array (C++23)(C++23)

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) owner_less<void> (C++17) 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) 低层内存管理 operator new operator new[] operator delete operator delete[] get_new_handler set_new_handler launder (C++17) bad_alloc bad_array_new_length nothrow_t align_val_t destroying_delete_t new_handler nothrow 杂项 pointer_traits (C++11) to_address (C++20) addressof (C++11) align (C++11) assume_aligned (C++20) C 库 malloc calloc realloc    aligned_alloc (C++17) free

 

std::scoped_allocator_adaptor

成员函数

scoped_allocator_adaptor::scoped_allocator_adaptor

scoped_allocator_adaptor::~scoped_allocator_adaptor

scoped_allocator_adaptor::operator=

scoped_allocator_adaptor::inner_allocator

scoped_allocator_adaptor::outer_allocator

scoped_allocator_adaptor::allocate

scoped_allocator_adaptor::deallocate

scoped_allocator_adaptor::max_size

scoped_allocator_adaptor::construct

scoped_allocator_adaptor::destroy

scoped_allocator_adaptor::select_on_container_copy_construction

非成员函数

operator==operator!= (C++20 前)

推导指引(C++17)

 

在标头 <scoped_allocator> 定义
scoped_allocator_adaptor();	(1)	(C++11 起)
template< class OuterA2 > scoped_allocator_adaptor( OuterA2&& outerAlloc, const InnerAllocs&... innerAllocs) noexcept;	(2)	(C++11 起)
scoped_allocator_adaptor( const scoped_allocator_adaptor& other ) noexcept;	(3)	(C++11 起)
scoped_allocator_adaptor( scoped_allocator_adaptor&& other ) noexcept;	(4)	(C++11 起)
template< class OuterA2 > scoped_allocator_adaptor( const scoped_allocator_adaptor<OuterA2, InnerAllocs...>& other )  noexcept;	(5)	(C++11 起)
template< class OuterA2 > scoped_allocator_adaptor( scoped_allocator_adaptor<OuterA2, InnerAllocs...>&& other ) noexcept;	(6)	(C++11 起)

1) 默认构造函数：值初始化 OuterAlloc 基类及内层分配器成员对象，若为实现所使用。

2) 从 std::forward<OuterA2>(outerAlloc) 构造基类 OuterAlloc ，并用 innerAllocs... 构造内层分配器。此重载只有在 std::is_constructible<OuterAlloc, OuterA2>::value 为 true时才会参与重载决议。

3) 复制构造函数：从 other 的对应分配器初始化每个分配器

4) 移动构造函数：从 other 的对应分配器移动每个分配器到 *this 内

5) 从 other 的对应分配器初始化每个分配器。此重载只有在 std::is_constructible<OuterAlloc, const OuterA2&>::value 为 true 时才会参与重载决议。

6) 用移动语义，从 other 的对应分配器初始化每个分配器。此重载只有在 std::is_constructible<OuterAlloc, OuterA2>::value 为 true 时才会参与重载决议。

参数

outerAlloc	-	外层分配器的构造函数参数
innerAllocs...	-	内层分配其的构造函数参数
other	-	另一 std::scoped_allocator_adaptor

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 2782	C++11	接收 OuterA2 的构造函数未受制约，干扰到元编程	添加了制约

参阅

allocate	用外层分配器分配未初始化存储 (公开成员函数)
construct	在分配的存储上构造一个对象，若适合则传递内存分配器至其构造函数 (公开成员函数)