Is the runtime behaviour correct? Have you been able to reproduce
--- In Boost-Users@yahoogroups.com, Kevlin Henney <kevlin@c...> wrote: the
warning with a smaller example based just on lexical_cast?
I have not tried to run program yet because of much bigger problems with random library -- it simply fails to compile (see my original post). Reproducing warning with lexical cast is straightforward: #include <boost/lexical_cast.hpp> #include <iostream> int main() { std::cout << boost::lexical_cast<int>("7") << std::endl; return 0; } reports the same warning I:\SW\EXTERNAL\BOOST_1_30_0\boost/lexical_cast.hpp(147) : warning C4800: 'void *' : forcing value to bool 'true' or 'false' (performance warning) I:\SW\EXTERNAL\BOOST_1_30_0\boost/lexical_cast.hpp(146) : while compiling class-template member function 'bool __thiscall boost::detail::lexical_stream<int,char *>::operator <<(char *const & )' Runtime behaviour of this program is correct. The warning is rather innocent, but annoying. Moreover the warning is abolutely correct -- returning stream from method with bool return type will convert void* to bool. Also it should be rather easy to fix, by explicitely casting it to bool.