Export (0) Print
Expand All
This topic has not yet been rated - Rate this topic

Allocators

Allocators are used by the Standard Template Library to handle the allocation and deallocation of elements stores in containers. All STL containers have a template argument of type allocator<Type>, where Type represents the type of the container element. For example, the vector class is declared as follows:

template <
    class Type,
    class Allocator = allocator<Type>
>
class vector

The Standard Template Library provides a default implementation for an allocator. In most cases, this default allocator should be sufficient. For more information on the default allocator, see allocator Class.

The default allocator uses new and delete to allocate and deallocate memory. If you want to use a different method of memory allocation, such as using shared memory, then you must create your own allocator.

Any allocator used with STL containers must implement the following type definitions:

const_pointer

rebind

const_reference

reference

difference_type

size_type

pointer

value_type

In addition, any allocator used with STL containers must implement the following methods:

Constructor

deallocate

Copy constructor

destroy

Destructor

max_size

address

operator==

allocate

operator!=

construct

For more information on these type definitions and methods, see allocator Class.

Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2014 Microsoft. All rights reserved.