id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5690	intrusive_ptr detach method	nn-mail@…	Peter Dimov	"It is very handy.
In some cases like passing between threads or between functions.

(e.g. Boost.ASIO needs this too)

Instead of writing this code:
{{{
#!cpp

intrusive_ptr<A> a(get_a());

intrusive_add_ref(a.get());
call(a.get());
}}}

One could write
{{{
#!cpp

intrusive_ptr<A> a(get_a());

call(a.detach());
}}}

The good thing in the second variation that we don't increase counter, so no 'lock' opcode to the processor. Better performance.

Patch:
{{{
#!cpp
	void* detach()
	{
		T * tmp = px;
		px = 0;
		return tmp;
	}
}}}

Thanx."	Patches	closed	To Be Determined	smart_ptr	Boost 1.47.0	Optimization	fixed	intrusive_ptr