id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7620	Basic rvalue and C++11 support	Antony Polukhin	ebf	"This patch adds `variant(variant&&)`, `variant& operator=(variant&&)` and `template <class T> variant& operator=(T&&)` functions to Boost.Variant for compilers with rvalue references support (rvalue emulation via Boost.Move is not used for compatability reasons).

`template <class T> variant& operator=(T&&)` function is enabled only if T&& is a rvalue reference.

Patch is constructded via copying original assign functions and adding move semantics to them. Example:
Visitor `copy_into` was copied as `move_into`. Copy constructors in `internal_visit` functions were replaced by move constructors.

If compiler supports rvalue references, std::move is imported to namespace ::boost::detail::variant (this also worked around bug with unqualified call to `move()` in MSVC2010)

`BOOST_NOEXCEPT` modifiers added to some methods.

This patch improves performance up to 6 times for some operations. 
Was tested on GCC-4.6 (with and without c++11 mode) and MSVC2012.
"	Patches	closed	Boost 1.53.0	variant	Boost 1.52.0	Optimization	fixed		antoshkka@…