Custom allocator in std::vector

Question

Is it possible to use custom allocator for std::vector internal allocations? If yes, how?

template < class T, class Allocator = allocator<T> > class vector; — Luchian Grigore
– Luchian Grigore, Commented Aug 10, 2012 at 7:08
First google link - josuttis.com/libbook/memory/myalloc1.cpp.html and josuttis.com/libbook/memory/myalloc.hpp.html — Luchian Grigore
– Luchian Grigore, Commented Aug 10, 2012 at 7:11
See this recent answer by Howard Hinnant: stackoverflow.com/a/11703840/819272 — TemplateRex
– TemplateRex, Commented Aug 10, 2012 at 7:20
@James: No. vector calls alloc.allocate() and alloc.deallocate() when the size changes. — Kerrek SB
– Kerrek SB, Commented Aug 10, 2012 at 10:02

bitmask · Accepted Answer · 2018-06-18 12:28:07Z

18

You basically have to implement your allocator type to conform to the Allocator concept.

The linked page lists all requirements of that type, but the core functionality is implemented in the allocate member function.

edited Jun 18, 2018 at 12:28

answered Aug 10, 2012 at 7:13

bitmask

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5 Comments

serup Over a year ago

could you give an example

bitmask Over a year ago

@serup Click on the link, it has tons of examples.

dtell Over a year ago

This is exactly the reason why link only answers are bad! The page doesn't exist anymore. Pointing towards examples in the broken link is even worse.

bitmask Over a year ago

At least I updated the link. The new page is referenced, as cppreference is a wiki. But your point is taken.

schoetbi Over a year ago

Here is a running example derived from the reference.

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