Re: [boost] [Review] Phoenix review starts today, September 21st

Subject: Re: [boost] [Review] Phoenix review starts today, September 21st
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2008-09-27 13:55:25

Joel de Guzman wrote:

> AFAIR, the old standard library result_type protocol is compatible
> with the result_of protocol.

std::result_of<F(the args types)> uses F::result_type if it exists, but 
the other way around is of course not possible, since result_type can 
only work with monomorphic functors.

So if I have a function that expects a functor F that provides 
F::result_type, the fact that the functor provides std::result_of<F(the 
args types)>::type, doesn't really help since it doesn't guarantee 
F::result_type is available.