[#BloombergLP-bdlma-ManagedAllocator]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlma.adoc[bdlma]::ManagedAllocator
:relfileprefix: ../../
:mrdocs:

Protocol for allocators that support releasing all allocated memory.

== Synopsis

Declared in `<bdlma_managedallocator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class ManagedAllocator
    : public xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]
----

== Description

This protocol class extends `bslma::Allocator` for allocators with the ability to `release` all memory currently allocated through the protocol back to the memory supplier of the derived concrete allocator object.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]`
| Pure abstract protocol for clients and suppliers of raw memory.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/Allocator/size_type.adoc[`size_type`] 
| Alias for an unsigned integral type capable of representing the number of bytes in this platform's virtual address space.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/Allocator/operator_assign.adoc[`operator=`] 
| 
| xref:BloombergLP/bslma/Allocator/allocate-03b.adoc[`allocate`] 
| Return a newly allocated block of memory of at least `size` bytes.
| xref:BloombergLP/bslma/Allocator/deallocate-04.adoc[`deallocate`] 
| Return the memory block at `address` to this allocator.
| xref:BloombergLP/bslma/Allocator/deleteObject-09.adoc[`deleteObject`] 
| `deleteObject` overloads
| xref:BloombergLP/bslma/Allocator/deleteObjectRaw-06f.adoc[`deleteObjectRaw`] 
| `deleteObjectRaw` overloads
| xref:BloombergLP/bslma/Allocator/is_equal.adoc[`is_equal`] 
| 
| xref:BloombergLP/bdlma/ManagedAllocator/release.adoc[`release`]  [.small]#[virtual]#
| Release all memory currently allocated through this allocator.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/Allocator/throwBadAlloc.adoc[`throwBadAlloc`] 
| Throw `std::bad_alloc` or abort the program.
|===


== Protected Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/Allocator/do_allocate.adoc[`do_allocate`]  [.small]#[virtual]#
| Return a newly allocated block of at least `bytes` with `alignment`.
| xref:BloombergLP/bslma/Allocator/do_deallocate.adoc[`do_deallocate`]  [.small]#[virtual]#
| Return the memory block at `p` having `bytes` and `alignment`.
| xref:BloombergLP/bslma/Allocator/do_is_equal.adoc[`do_is_equal`]  [.small]#[virtual]#
| Return whether this allocator can exchange memory with `other`.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlma/BufferedSequentialAllocator.adoc[`BufferedSequentialAllocator`] 
| Fast allocator that dispenses heterogeneous blocks from an external buffer.
| xref:BloombergLP/bdlma/ConcurrentMultipoolAllocator.adoc[`ConcurrentMultipoolAllocator`] 
| Thread‐safe allocator managing pools of varying block sizes.
| xref:BloombergLP/bdlma/MultipoolAllocator.adoc[`MultipoolAllocator`] 
| Allocator that manages pools of memory blocks of varying sizes.
| xref:BloombergLP/bdlma/SequentialAllocator.adoc[`SequentialAllocator`] 
| Fast allocator that dispenses heterogeneous blocks from dynamically allocated buffers.
| xref:BloombergLP/balst/StackTraceTestAllocator.adoc[`StackTraceTestAllocator`] 
| This class defines a concrete "test" allocator mechanism that implements the `bdlma::ManagedAllocator` protocol.
|===


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