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Mehdi Amini 40451e4bf7 Add variant of map constructors to avoid useless extra allocator copy when using initializer list

Many existing constructors have this form:

  map(std::initializer_list<value_type> il, const Compare& comp = Compare(), const allocator_type& a = allocator_type())

The issue is that a temporary allocator_type is constructed, and
passed to the base class where it is used to copy-constructed the
rebound allocator.
This temporary allocator_type here is always destroyed at the end
of the map() constructor. For stateful allocators this is not
desirable.
The solution is to adopt what libc++ is doing and have to constructors:

  map(std::initializer_list<value_type> il, const Compare& comp = Compare(), const allocator_type& a)

and

  map(std::initializer_list<value_type> il, const Compare& comp = Compare())

This way, unless an allocator is provided by the client, no extra temporary
creation/destruction occurs.

2017-05-08 12:39:06 -07:00

bench

[inspection report] remove tabs and fix copyright notice format

2016-12-20 11:03:57 +09:00

build

Add Polymorphic Memory Resource utilities and rework the separately compiled library:

2015-09-07 19:16:46 +02:00

doc

Implement extract_sequence and adopt_sequence for flat ordered associative containers

2017-04-05 16:06:31 +02:00

example

Fix mixed CR & CRLF newlines.

2016-07-31 23:02:52 +02:00

include/boost/container

Add variant of map constructors to avoid useless extra allocator copy when using initializer list

2017-05-08 12:39:06 -07:00