Showing content from https://timsong-cpp.github.io/cppwp/n4659/meta.trans.cv below:
[meta.trans.cv]
Template Comments template <class T>
struct remove_const; The member typedef type names the same type as T except that any top-level const-qualifier has been removed. [ Example: remove_const_t<const volatile int> evaluates to volatile int, whereas remove_const_t<const int*> evaluates to const int*. — end example ] template <class T>
struct remove_volatile; The member typedef type names the same type as T except that any top-level volatile-qualifier has been removed. [ Example: remove_volatile_t<const volatile int> evaluates to const int, whereas remove_volatile_t<volatile int*> evaluates to volatile int*. — end example ] template <class T>
struct remove_cv; The member typedef type shall be the same as T except that any top-level cv-qualifier has been removed. [ Example: remove_cv_t<const volatile int> evaluates to int, whereas remove_cv_t<const volatile int*> evaluates to const volatile int*. — end example ] template <class T>
struct add_const; If T is a reference, function, or top-level const-qualified type, then type names the same type as T, otherwise T const. template <class T>
struct add_volatile; If T is a reference, function, or top-level volatile-qualified type, then type names the same type as T, otherwise T volatile. template <class T>
struct add_cv; The member typedef type names the same type as add_const_t<add_volatile_t<T>>.
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