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These anonymous objects are considered constant as they merely exist for
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passing the information of (class type) objects to functions. They are not
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considered 'variables'. Of course, a tt(const_cast) could be used to cast away
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returns. These anonymous objects used to initialize const references should
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not be confused with rvalue references (section ref(RREF)) which have a
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completely different purpose in life. Rvalue references primarily exist to be