Re: [boost] [function] function wrapping with no exception safetyguarantee

Daniel Walker wrote:

void do_stuff(boost::function<int(int)> f) { // ... if(f) { // Remove the exception safety guarantee for this block. boost::unsafe_function<int(int)> g = f; for(int i = 0; i < INT_MAX; ++i) g(i); } // ... }

This example implies that unsafe_function is inherently more efficient, but this need not be so. An empty function may point to throw_bad_function_call instead of NULL.