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

Subject: Re: [boost] [function] function wrapping with no exception safetyguarantee
From: Peter Dimov (pdimov_at_[hidden])
Date: 2010-10-07 21:22:22

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.