Ensures that the integer_t objects can be safely used by multiple threads.
This is the opposite of the copy_on_write option. It is the default behavior; the option is provided only to make it easier to write self-documenting code.
Note that even with this option, it is still your responsibility to ensure that only one thread accesses a particular integer object at a time.
© Copyright Chad Nelson, 2010-2011. Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)