id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9166	Memory leak when copying empty boost::container::vector	onlyone@…	Ion Gaztañaga	"Consider the following simple program:

{{{
#include <boost/container/vector.hpp>

int main() {
    while (true) {
        boost::container::vector<int> vec;
        boost::container::vector<int> vec2(vec);
    }
}
}}}

With Boost 1.54.0, this leaks an unbounded amount of memory. The copy contructor of `boost::container::vector` performs an allocation (which in this case asks for 0 bytes), and sets the capacity of the new vector the size of this allocation (0 elements), and since the capacity is 0, the destructor of vec2 does not deallocate this memory.

A simple patch is attached which disables allocation when the requested size is 0. This may not be the optimal solution (for example, there might be code that subsequently reads from `m_start` and expects it to contain a valid value (I have not yet studied the code sufficiently to know)). Even so, this is a major issue, and so I am reporting it even without a fully tested patch.

Evan Wallace"	Bugs	closed	To Be Determined	container	Boost 1.54.0	Problem	fixed