std::scoped_allocator_adaptor<OuterAlloc,InnerAlloc...>::outermost, outermost-construct, outermost-destroy

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Memory management library

Allocators allocator allocator_traits (C++11) allocation_result (C++23) scoped_allocator_adaptor (C++11) allocator_arg (C++11) uses_allocator (C++11) uses_allocator_construction_args (C++20) make_obj_using_allocator (C++20) pmr::polymorphic_allocator (C++17) uninitialized_construct_using_allocator (C++20) Memory resources pmr::memory_resource (C++17) pmr::get_default_resource (C++17)     pmr::set_default_resource (C++17) pmr::new_delete_resource (C++17) pmr::pool_options (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) Explicit lifetime management start_lifetime_as (C++23) start_lifetime_as_array (C++23) Types for composite class design indirect (C++26) polymorphic (C++26) Miscellaneous pointer_traits (C++11) to_address (C++20) addressof (C++11) align (C++11) assume_aligned (C++20) is_sufficiently_aligned (C++26) C Library malloc      free calloc realloc aligned_alloc (C++17) free_sized (C++26) free_aligned_sized (C++26) memalignment (C++26) Uninitialized storage (until C++20*) raw_storage_iterator get_temporary_buffer return_temporary_buffer Garbage collector support (until C++23) declare_reachable (C++11) declare_no_pointers (C++11) pointer_safety (C++11) undeclare_reachable (C++11) undeclare_no_pointers (C++11) get_pointer_safety (C++11)

Specialized <memory> algorithms Low level memory management operator newoperator new[] operator deleteoperator delete[] nothrow nothrow_t new_handler set_new_handler get_new_handler (C++11) bad_alloc bad_array_new_length (C++11) align_val_t (C++17) destroying_delete_t (C++20) launder (C++17) Smart pointers unique_ptr (C++11) shared_ptr (C++11) weak_ptr (C++11) auto_ptr (until C++17*) owner_less (C++11) owner_less<void> (C++17) owner_hash (C++26) owner_equal (C++26) 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)

 

std::scoped_allocator_adaptor

Member functions

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

scoped_allocator_adaptor::outermost scoped_allocator_adaptor::outermost-construct scoped_allocator_adaptor::outermost-destroy

Non-member functions

operator==operator!= (until C++20)

Deduction guides(C++17)

 

template< class Alloc > /* unspecified */ /*outermost*/( Alloc&& alloc = *this );	(1)	(exposition only*)
template< class T, class... Args > void /*outermost-construct*/( T* p, Args&&... args );	(2)	(exposition only*)
template< class T > void /*outermost-destroy*/( T* p );	(3)	(exposition only*)

These exposition-only helper member function templates are used in member functions construct() and destroy().

1) Obtains the outermost allocator of alloc.

• If the expression alloc.outer_allocator() is valid, returns outermost (alloc.outer_allocator()).
• Otherwise, returns alloc.

2,3) Constructs or destroys an object using the outermost allocator of *this.

Given the type std::allocator_traits<std::remove_reference_t<decltype(outermost ())>> as outermost_traits:

2) Equivalent to outermost_traits::construct(outermost (), p, std::forward<Args>(args)...);.

3) Equivalent to outermost_traits::destroy(outermost (), p);.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 3116	C++11	the recursion condition for outermost was “alloc has the member function outer_allocator()”	changed to “the expression alloc.outer_allocator() is valid”

See also

construct [static]	constructs an object in the allocated storage (function template)
destroy [static]	destructs an object stored in the allocated storage (function template)