"John Maddock" <john@johnmaddock.co.uk> wrote in message news:00f101c6b86f$68577300$96f20352@fuji...
Gennadiy Rozental wrote:
Could you try this?
I sympathise, but there is a problem still: there are some std lib's (STLport springs to mind, plus some Borland versions) where numeric_limits<>::is_specialized is *not* a compile time constant. It doesn't effect all compilers/std lib's, and we have a config macro BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS for this, but then you're into applying workarounds on the workaround :-(
Ok how about this: namespace tt_detail { template<typename FPT> struct fpt_limits { FPT min_value() { return std::numeric_limits<FPT>::is_specialized ? (std::numeric_limits<FPT>::min)() : 0; } FPT max_value() { return std::numeric_limits<FPT>::is_specialized ? (std::numeric_limits<FPT>::max)() : static_cast<FPT>(1000000); } }; template<typename FPT> inline FPT safe_fpt_division( FPT f1, FPT f2 ) { // Avoid overflow. if( f2 < static_cast<FPT>(1) && f1 > f2*fpt_limits<FPT>::max_value() ) return fpt_limits<FPT>::max_value(); // Avoid underflow. if( f1 == static_cast<FPT>(0) || f2 > static_cast<FPT>(1) && f1 < f2*fpt_limits<FPT>::min_value() ) return static_cast<FPT>(0); return f1/f2; } } // namespace tt_detail Gennadiy