[boost] Re: Herb Sutter's Assignment operator can be optimized + Proposal for very small boost utility library

Pavel Chikulaev wrote:

Do you know that well-known Herb Sutter's assignment operator in most cases does unnecessary copying?

I don't know that it's "Herb's" assignment operator. He certainly popularized the idiom with his book, but it may have existed before that.

[...] Matrix func (); Matrix a; //... Matrix = func();

Result of func() is copied to temporary objectand then operator = copies it again. So assigning to result of function creates one useless object. [...]

I would like to see compiler tests that show that neither RVO nor NRVO work in these cases first. Dave