Standard library header <scoped_allocator>

 

C++

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Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library(C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library(C++17)

Regular expressions library(C++11)

Atomic operations library(C++11)

Thread support library(C++11)

Technical Specifications

 

Standard Library headers

Language Support
<cstddef> <cstdlib> <version> <limits> <climits>	<cfloat> <cstdint> <new> <typeinfo>	<source_location> <exception> <initializer_list> <compare>	<coroutine> <csignal> <csetjmp> <cstdarg>
Concepts
<concepts>
Diagnostics
<stdexcept>	<cassert>	<cerrno>	<system_error>
General utilities
<utility> <memory> <memory_resource> <scoped_allocator>	<bitset> <tuple> <optional> <any>	<variant> <type_traits> <ratio> <chrono>	<typeindex> <functional> <ctime>
Strings
<string> <string_view> <cstring>	<charconv> <format>	<cctype> <cwctype>	<cwchar> <cuchar>
Localization
<locale>	<codecvt>	<clocale>
Containers
<span> <array> <vector>	<deque> <forward_list> <list>	<map> <set> <queue>	<unordered_map> <unordered_set> <stack>
Iterators
<iterator>
Ranges
<ranges>
Algorithms
<algorithm>	<execution>
Numerics
<complex> <random>	<valarray> <numeric>	<bit> <numbers>	<cfenv> <cmath>
Input/Output
<iosfwd> <ios> <iomanip> <streambuf>	<istream> <ostream> <iostream>	<sstream> <fstream> <syncstream>	<cstdio> <cinttypes> <strstream>
Regular expressions
<regex>
Filesystem support
<filesystem>
Thread support
<thread> <atomic> <mutex>	<shared_mutex> <condition_variable> <future>	<stop_token> <semaphore>	<latch> <barrier>
C compatibility
<ciso646> <cstdalign>	<cstdbool> <ccomplex>	<ctgmath>

 

This header is part of the dynamic memory management library.

Classes
scoped_allocator_adaptor (C++11)	implements multi-level allocator for multi-level containers (class template)
Functions
operator==operator!= (removed in C++20)	compares two scoped_allocator_adaptor instances (public member function of std::scoped_allocator_adaptor<OuterAlloc,InnerAlloc...>)

Synopsis

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

Class template std::scoped_allocator_adaptor

namespace std {template<class OuterAlloc, class... InnerAllocs>class scoped_allocator_adaptor :public OuterAlloc {private:using OuterTraits = allocator_traits<OuterAlloc>;// exposition only scoped_allocator_adaptor<InnerAllocs...> inner;// exposition only   public:using outer_allocator_type = OuterAlloc;using inner_allocator_type =/* see description */;   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 =/* see description */;using propagate_on_container_move_assignment =/* see description */;using propagate_on_container_swap =/* see description */;using is_always_equal =/* see description */;   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()constnoexcept; outer_allocator_type& outer_allocator()noexcept;const outer_allocator_type& outer_allocator()constnoexcept;   [[nodiscard]] pointer allocate(size_type n);[[nodiscard]] 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 T>void destroy(T* p);   scoped_allocator_adaptor select_on_container_copy_construction()const;};   template<class OuterAlloc, class... InnerAllocs> scoped_allocator_adaptor(OuterAlloc, InnerAllocs...)-> scoped_allocator_adaptor<OuterAlloc, InnerAllocs...>;}