Re: [boost] [Boost.utility]

27 Jan 2010

      AMDG

Andrew Chinkoff wrote:
...
*** BEGIN EXPLANATION ***
Let us imagine that boost::call_once has approximately this implementation
(in pseudo code):
call_once(function foo)
{
  if(!called)
  {
      Locker locker;
      if(!called)
      {
      	called = true;
      	foo(); (1)
      }
  }
}
called = true; has to go /after/ the call to foo.

Otherwise, this works once you add in the magic needed to
prevent the compiler and the hardware from reordering operations.

In Christ,
Steven Watanabe