C++ : Why is 'declval' specified in terms of 'add_rvalue_reference T ::type' and not 'T&&'?

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C++ : Why is 'declval' specified in terms of 'add_rvalue_reference T ::type' and not 'T&&'?
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C++ : Why is 'declval' specified in terms of 'add_rvalue_reference T ::type' and not 'T&&'?
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