标准库头文件 <scoped_allocator>

 

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技术规范

 

标准库头文件

语言支持
<cstddef> <limits> <climits> <coroutine>	<cfloat> <cstdint> <new> <source_location>	<typeinfo> <exception> <initializer_list> <version>	<csignal> <csetjmp> <cstdarg>
概念
<concepts>
诊断
<stdexcept>	<cassert>	<cerrno>	<system_error>
通用工具
<utility> <memory> <memory_resource> <scoped_allocator>     <compare>	<bitset> <tuple> <optional> <any> <variant>	<type_traits> <ratio> <chrono> <typeindex> <functional>	<ctime> <cstdlib>
字符串
<string> <string_view> <cstring>	<charconv> <format>	<cctype> <cwctype>	<cwchar> <cuchar>
本地化
<locale>	<codecvt>	<clocale>
容器
<span> <array> <vector>	<deque> <forward_list> <list>	<map> <set> <queue>	<unordered_map> <unordered_set> <stack>
迭代器
<iterator>
范围
<ranges>
算法
<algorithm>	<execution>
数值
<complex> <random>	<valarray> <numeric>	<bit> <numbers>	<cfenv> <cmath>
输入/输出
<iosfwd> <ios> <iomanip> <streambuf>	<istream> <ostream> <iostream>	<sstream> <fstream> <syncstream>	<cstdio> <cinttypes> <strstream>
正则表达式
<regex>
文件系统
<filesystem>
线程支持
<thread> <atomic> <mutex>	<shared_mutex> <condition_variable> <future>	<stop_token> <semaphore>	<latch> <barrier>
C 兼容
<ciso646> <cstdalign>	<cstdbool> <ccomplex>	<ctgmath>

 

此头文件是动态内存管理库的一部分。

类
scoped_allocator_adaptor (C++11)	为多级容器实现的多级分配器 (类模板)
函数
operator==operator!=	比较两个 scoped_allocator_adaptor 实例 (std::scoped_allocator_adaptor<OuterAlloc,InnerAlloc...> 的公开成员函数)

概要

namespace std {
 
    template <class OuterAlloc, class... InnerAlloc>
    class scoped_allocator_adaptor;
 
    template <class OuterA1, class OuterA2, class... InnerAllocs>
    bool operator==(const scoped_allocator_adaptor<OuterA1,
                                                   InnerAllocs...>& a,
                    const scoped_allocator_adaptor<OuterA2,
                                                   InnerAllocs...>& b) noexcept;
    template <class OuterA1, class OuterA2, class... InnerAllocs>
    bool operator!=(const scoped_allocator_adaptor<OuterA1,
                                                   InnerAllocs...>& a,
                    const scoped_allocator_adaptor<OuterA2,
                                                   InnerAllocs...>& b) noexcept;
}

类模板 std::scoped_allocator_adaptor

namespace std {
  template <class OuterAlloc, class... InnerAllocs>
  class scoped_allocator_adaptor : public OuterAlloc {
  private:
    using OuterTraits = allocator_traits<OuterAlloc>; // 仅用于阐释
    scoped_allocator_adaptor<InnerAllocs...> inner; // 仅用于阐释
  public:
    using outer_allocator_type = OuterAlloc;
    using inner_allocator_type = /* 见定义 */ ;
    using value_type = typename OuterTraits::value_type;
    using size_type = typename OuterTraits::size_type;
    using difference_type = typename OuterTraits::difference_type;
    using pointer = typename OuterTraits::pointer;
    using const_pointer = typename OuterTraits::const_pointer;
    using void_pointer = typename OuterTraits::void_pointer;
    using const_void_pointer = typename OuterTraits::const_void_pointer;
    using propagate_on_container_copy_assignment = /* 见定义 */ ;
    using propagate_on_container_move_assignment = /* 见定义 */ ;
    using propagate_on_container_swap = /* 见定义 */ ;
    using is_always_equal = /* 见定义 */ ;
    template <class Tp>
    struct rebind {
      using other = scoped_allocator_adaptor<
                      OuterTraits::template rebind_alloc<Tp>,
                      InnerAllocs...>;
    };
    scoped_allocator_adaptor();
    template <class OuterA2>
    scoped_allocator_adaptor(OuterA2&& outerAlloc,
                             const InnerAllocs&... innerAllocs) noexcept;
    scoped_allocator_adaptor(const scoped_allocator_adaptor& other) noexcept;
    scoped_allocator_adaptor(scoped_allocator_adaptor&& other) noexcept;
    template <class OuterA2>
    scoped_allocator_adaptor(const scoped_allocator_adaptor<
                                     OuterA2,
                                     InnerAllocs...>& other) noexcept;
    template <class OuterA2>
    scoped_allocator_adaptor(scoped_allocator_adaptor<
                               OuterA2,
                               InnerAllocs...>&& other) noexcept;
    scoped_allocator_adaptor& operator=(const scoped_allocator_adaptor&) = default;
    scoped_allocator_adaptor& operator=(scoped_allocator_adaptor&&) = default;
    ~scoped_allocator_adaptor();
    inner_allocator_type& inner_allocator() noexcept;
    const inner_allocator_type& inner_allocator() const noexcept;
    outer_allocator_type& outer_allocator() noexcept;
    const outer_allocator_type& outer_allocator() const noexcept;
    pointer allocate(size_type n);
    pointer allocate(size_type n, const_void_pointer hint);
    void deallocate(pointer p, size_type n);
    size_type max_size() const;
    template <class T, class... Args>
    void construct(T* p, Args&&... args);
    template <class T1, class T2, class... Args1, class... Args2>
    void construct(pair<T1, T2>* p, piecewise_construct_t,
                   tuple<Args1...> x, tuple<Args2...> y);
    template <class T1, class T2>
    void construct(pair<T1, T2>* p);
    template <class T1, class T2, class U, class V>
    void construct(pair<T1, T2>* p, U&& x, V&& y);
    template <class T1, class T2, class U, class V>
    void construct(pair<T1, T2>* p, const pair<U, V>& x);
    template <class T1, class T2, class U, class V>
    void construct(pair<T1, T2>* p, pair<U, V>&& x);
    template <class T>
    void destroy(T* p);
    scoped_allocator_adaptor select_on_container_copy_construction() const;
  };
}