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#pragma once
#include "asl/meta.hpp"
#define ASL_MOVE(expr_) (static_cast<::asl::un_ref_t<decltype(expr_)>&&>(expr_))
#define ASL_FWD(expr_) (static_cast<decltype(expr_)&&>(expr_))
namespace asl
{
template<typename T, typename U>
T exchange(T& obj, U&& new_value)
{
T old_value = ASL_MOVE(obj);
obj = ASL_FORWARD(new_value);
return old_value;
}
} // namespace asl
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