Re: [boost] Proposed changes to operators.hpp

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-07-03 05:46:35

From: "Yitzhak Sapir" <yitzhaks_at_[hidden]>
> I had to view Daniel Frey's mail as an attachment, but from reading it I
have a question:
>
> He suggested:
> > friend const T operator+( const T& lhs, const T& rhs )
> > {
> >    T nrv( lhs );
> >    nrv += rhs;
> >    return nrv;
> > }
>
> Why not use:
>
> friend const T operator+ (const T& lhs, const T& rhs)
> {
>     return T(lhs) += rhs;
> }
>
> doing away with the named temporary, and possibly using normal return
value optimization?

Because this assumes that the compiler knows that T::operator+= returns
*this.