Re: [PATCH] Exploit move semantics in std::accumulate.

[Marc Glisse <marc dot glisse at inria dot fr>]

On Tue, 11 Jan 2011, Paolo Carlini wrote:

> > Why use x=move(x)+y and not x+=y?
> if we do this (good point)...

> > std::string operator+(std::string const&,MyType){...}
> > std::string operator+(std::string&&,MyType)=delete;
> ... then this shouldn't be an issue anymore, right?

But then the user could have defined

std::string operator+(std::string const&,MyType){...}

but not operator+=(std::string&,MyType)

If you want it to be equivalent, I don't think you can avoid making a list 
of cases known to work.

--
Marc Glisse