Question
it's an expression (not to be confused with a variable), which designates an object. A simple way to tell if something is an lvalue is if you can take its address (this only fails for bit field lvalues, whose addresses cannot be taken)
see http://en.cppreference.com/w/cpp/language/value_category for detail
see http://en.cppreference.com/w/cpp/language/value_category for detail
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