Mathias Gaunard wrote:
Isaac Dupree wrote:
I'm looking at all these "operator unspecified_bool_type"s in Boost. They vary:
It's hard to get all of these right, and various Boost libraries have made changes in the past that got it wrong: type-safety compiler workarounds zero runtime overhead (a.k.a. more compiler workarounds)
At some time, there was a safe-bool thingy in Boost.Operators, but it was removed. I honestly do not know why.
Well, I found http://www.pdc.kth.se/training/Talks/C++/boost/libs/utility/operators.htm#sa... and http://lists.boost.org/Archives/boost/2003/03/45401.php not contained here: http://www.boost.org/doc/libs/1_31_0/libs/utility/operators.htm the changelog of the first link mentions a change in '05 that isn't in mainline. The thread goes some way pointing out pitfalls. I had some difficulty reading the thread, but it seems to start here: http://lists.boost.org/Archives/boost/2003/02/44923.php Anyway then it just ends. Maybe it wasn't ever finished and included into boost?