Is there any reason why `std::exchange` is not `constexpr`? – stackoverflow.com

Is there any reason why `std::exchange` is not `constexpr`? – stackoverflow.com

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std::exchange, introduced in C++14, is specified as follows: template< class T, class U = T > T exchange( T& obj, U&& new_value ); Replaces the value of obj with new_value and ...

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