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Message: [QUOTE="Giovanni Gherdovich, post: 3615240"] Hello, thank you for your answers. mlimber You are completely right. In the code I provided defining "addition" as a function object instead of an ordinary function is just stupid. But I wrote that code to isolate an error wich I had on such a function object... I usually write function objects without state when I have to pass them to algorithms, like the ones in <algorithm> or <numeric>. Since, in this kind of usage, I don't need to istantiate them and I think to them as "functions", sometimes I forgot that they are "classes", like above. And after discovering std::ptr_fun [URL]http://www.cplusplus.com/reference/misc/functional/ptr_fun.html[/URL] I don't need to write such "fake classes" any more... Thank you for the reference to the docs, but mine was only a toy example to reproduce an error I had in the code I'm writing. The addition was not my first concern. Rolf Magnus This _is_ interesting. What semantics has the line you wrote? I admit I was foo when posting my original question, and the first answer made me realize that a class _must_ be instatiated to do something useful. But you seem to use the function object as-it-is.. Can you say more about this, or point to any doc/book/whatever? Thankyou. Regards, Giovanni Gh. [/QUOTE]