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Why is return value optimization happening here

Because you've quoted an irrelevant paragraph. The relevant one is the one above (from the same source):

If a function returns a class type by value, and the return statement's expression is the name of a non-volatile object with automatic storage duration, which isn't the function parameter, or a catch clause parameter, and which has the same cv-unqualified type as the return type of the function, then copy/move is omitted.

Any of the stated conditions permit copy elision.

Categories : C++

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