Why do const references extend the lifetime of rvalues?

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It was proposed in 1993. Its purpose was to eliminate the inconsistent handling of temporaries when bound to references.

Back then, there was no such thing as RVO, so simply banning the binding of a temporary to a reference would have been a performance hit.

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/1993/N0345.pdf

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