All this talk of named objects, unnamed objects, and compiler optimizations is interesting, but let us not forget the big picture. The big picture is that assignment versions of operators (such as operator+=) tend to be more efficient than stand-alone versions of those operators (e.g. operator+). As a library designer, you should offer both, and as an application developer, you should consider using assignment versions of operators instead of stand-alone versions whenever performance is at a premium.
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