[allocator.adaptor.cnstr]

# 20 Memory management library [[mem]](./#mem)

## 20.6 Class template scoped_allocator_adaptor [[allocator.adaptor]](allocator.adaptor#cnstr)

### 20.6.3 Constructors [allocator.adaptor.cnstr]

[🔗](#lib:scoped_allocator_adaptor,constructor)

`scoped_allocator_adaptor();
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8787)

*Effects*: Value-initializes the OuterAlloc base class and the inner allocator
object[.](#1.sentence-1)

[🔗](#lib:scoped_allocator_adaptor,constructor_)

`template<class OuterA2>
  scoped_allocator_adaptor(OuterA2&& outerAlloc, const InnerAllocs&... innerAllocs) noexcept;
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8800)

*Constraints*: is_constructible_v<OuterAlloc, OuterA2> is true[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8804)

*Effects*: Initializes the OuterAlloc base class withstd​::​forward<OuterA2>(outerAlloc) and inner with innerAllocs... (hence recursively initializing each allocator within the adaptor with the corresponding
allocator from the argument list)[.](#3.sentence-1)

[🔗](#lib:scoped_allocator_adaptor,constructor__)

`scoped_allocator_adaptor(const scoped_allocator_adaptor& other) noexcept;
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8818)

*Effects*: Initializes each allocator within the adaptor with the corresponding allocator
from other[.](#4.sentence-1)

[🔗](#lib:scoped_allocator_adaptor,constructor___)

`scoped_allocator_adaptor(scoped_allocator_adaptor&& other) noexcept;
`

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8830)

*Effects*: Move constructs each allocator within the adaptor with the corresponding allocator
from other[.](#5.sentence-1)

[🔗](#lib:scoped_allocator_adaptor,constructor____)

`template<class OuterA2>
  scoped_allocator_adaptor(
    const scoped_allocator_adaptor<OuterA2, InnerAllocs...>& other) noexcept;
`

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8844)

*Constraints*: is_constructible_v<OuterAlloc, const OuterA2&> is true[.](#6.sentence-1)

[7](#7)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8848)

*Effects*: Initializes each allocator within the adaptor with the corresponding allocator
from other[.](#7.sentence-1)

[🔗](#lib:scoped_allocator_adaptor,constructor_____)

`template<class OuterA2>
  scoped_allocator_adaptor(scoped_allocator_adaptor<OuterA2, InnerAllocs...>&& other) noexcept;
`

[8](#8)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8861)

*Constraints*: is_constructible_v<OuterAlloc, OuterA2> is true[.](#8.sentence-1)

[9](#9)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L8865)

*Effects*: Initializes each allocator within the adaptor with the corresponding allocator rvalue
from other[.](#9.sentence-1)