This function is invoked by the library whenever it is not possible to produce a result for an arithmetic operation. void overflow(char const * const msg);

If environment supports C++ exceptions, this function throws the exception . If the environment does not support C++ exceptions, the user should implement this function and expect it to be called when appropriate. boost/config.hpp defines BOOST_NO_EXCEPTIONS when the environment doesn't support exceptions. It is by checking for the definition of this macro that the system determines whether or not exceptions are supported.

#include <boost/safe_numerics/overflow.hpp>

#include <cstdio> void overflow(char const * const msg){ std::fputs("safe_numerics overflow error:, std::stderr); std::fputs(msg, std::stderr); std::fputc('\n', std::stderr); }

See rationale for more information on this function