---
name: "std::scoped_allocator_adaptor"
section: "3cxx"
platform: "linux"
package: "libstdc++-12-doc"
version: "12.4.0-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/std::scoped_allocator_adaptor/3cxx"
---

# std::scoped\_allocator\_adaptor(3cxx)

An adaptor to recursively pass an allocator to the objects it constructs.

## NAME

std::scoped\_allocator\_adaptor\< \_OuterAlloc, \_InnerAllocs \> - An adaptor to recursively pass an allocator to the objects it constructs.

## SYNOPSIS

`#include <scoped_allocator>`

Inherits \_OuterAlloc.

### Public Types

**typedef** \_\_traits::const\_pointer **const\_pointer**\
 **typedef** \_\_traits::const\_void\_pointer **const\_void\_pointer**\
 **typedef** \_\_traits::difference\_type **difference\_type**\
 **typedef** \_\_inner\_type::\_\_type **inner\_allocator\_type**\
 **typedef** \_\_and\_\< typename\_\_traits::is\_always\_equal, **typenameallocator\_traits**\< **\_InnerAllocs** \>::is\_always\_equal... \>::type **is\_always\_equal**\
 **typedef** \_OuterAlloc **outer\_allocator\_type**\
 **typedef** \_\_traits::pointer **pointer**\
 **typedef** \_\_or\_\< typename\_\_traits::propagate\_on\_container\_copy\_assignment, **typenameallocator\_traits**\< **\_InnerAllocs** \>::propagate\_on\_container\_copy\_assignment... \>::type **propagate\_on\_container\_copy\_assignment**\
 **typedef** \_\_or\_\< typename\_\_traits::propagate\_on\_container\_move\_assignment, **typenameallocator\_traits**\< **\_InnerAllocs** \>::propagate\_on\_container\_move\_assignment... \>::type **propagate\_on\_container\_move\_assignment**\
 **typedef** \_\_or\_\< typename\_\_traits::propagate\_on\_container\_swap, **typenameallocator\_traits**\< **\_InnerAllocs** \>::propagate\_on\_container\_swap... \>::type **propagate\_on\_container\_swap**\
 **typedef** \_\_traits::size\_type **size\_type**\
 **typedef** \_\_traits::value\_type **value\_type**\
 **typedef** \_\_traits::void\_pointer **void\_pointer**\

### Public Member Functions

template\<**typename** **\_Outer2** , **typename**  = \_Constructible\<\_Outer2\>\> **scoped\_allocator\_adaptor** (**\_Outer2** &&**\_\_outer**, const **\_InnerAllocs** &... **\_\_inner**) noexcept\
 **scoped\_allocator\_adaptor** (const **scoped\_allocator\_adaptor** &\_\_other) noexcept\
 template\<**typename** **\_Outer2** , **typename**  = \_Constructible\<const \_Outer2&\>\> **scoped\_allocator\_adaptor** (const **scoped\_allocator\_adaptor**\< **\_Outer2**, \_InnerAllocs... \> &\_\_other) noexcept\
 **scoped\_allocator\_adaptor** (**scoped\_allocator\_adaptor** &&\_\_other) noexcept\
 template\<**typename** **\_Outer2** , **typename**  = \_Constructible\<\_Outer2\>\> **scoped\_allocator\_adaptor** (**scoped\_allocator\_adaptor**\< **\_Outer2**, \_InnerAllocs... \> &&\_\_other) noexcept\
 pointer **allocate** (size\_type \_\_n)\
 pointer **allocate** (size\_type \_\_n, const\_void\_pointer **\_\_hint**)\
 template\<**typename** \_Tp , typename... \_Args\> **void** **construct** (\_Tp \*\_\_p, **\_Args** &&... **\_\_args**)\
 **void** **deallocate** (pointer \_\_p, size\_type \_\_n) noexcept\
 template\<**typename** \_Tp \> **void** **destroy** (\_Tp \*\_\_p)\
 const inner\_allocator\_type & **inner\_allocator** () const noexcept\
 inner\_allocator\_type & **inner\_allocator** () noexcept\
 size\_type **max\_size** () const\
 **scoped\_allocator\_adaptor** & **operator=** (const **scoped\_allocator\_adaptor** &)=**default**\
 **scoped\_allocator\_adaptor** & **operator=** (**scoped\_allocator\_adaptor** &&)=**default**\
 const outer\_allocator\_type & **outer\_allocator** () const noexcept\
 outer\_allocator\_type & **outer\_allocator** () noexcept\
 **scoped\_allocator\_adaptor** **select\_on\_container\_copy\_construction** () const\

### Friends

template\<typename... \> **struct** **\_\_inner\_type\_impl**\
 template\<**typename** **\_OutA1** , **typename** **\_OutA2** , typename... \_InA\> bool **operator==** (const **scoped\_allocator\_adaptor**\< **\_OutA1**, \_InA... \> &\_\_a, const **scoped\_allocator\_adaptor**\< **\_OutA2**, \_InA... \> &\_\_b) noexcept\

### Related Symbols

(Note that these are not member symbols.)  template\<**typename** **\_OutA1** , **typename** **\_OutA2** , typename... \_InA\> bool **operator==** (const **scoped\_allocator\_adaptor**\< **\_OutA1**, \_InA... \> &\_\_a, const **scoped\_allocator\_adaptor**\< **\_OutA2**, \_InA... \> &\_\_b) noexcept\

## Detailed Description

### template\<typename \_OuterAlloc, typename... \_InnerAllocs\>

class std::scoped\_allocator\_adaptor\< \_OuterAlloc, \_InnerAllocs \>"An adaptor to recursively pass an allocator to the objects it constructs.

## Author

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