# Standard library header <experimental/ranges/type_traits>

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This header is part of the ranges library.

### Metaprogramming and type traits

Defined in namespace `std::experimental::ranges`
is_swappable_withis_swappableis_nothrow_swappable_withis_nothrow_swappable | checks if objects of a type can be swapped with objects of same or different type (class template)
common_reference | determine the common reference type of a set of types (class template)
common_type | determine the common type of a set of types (class template)

### Synopsis

    namespace std { namespace experimental { namespace ranges { inline namespace v1 {

    template <class T, class U> struct is_swappable_with;
    template <class T> struct is_swappable;

    template <class T, class U> struct is_nothrow_swappable_with;
    template <class T> struct is_nothrow_swappable;

    template <class T, class U> constexpr bool is_swappable_with_v
      = is_swappable_with<T, U>::value;
    template <class T> constexpr bool is_swappable_v
      = is_swappable<T>::value;

    template <class T, class U> constexpr bool is_nothrow_swappable_with_v
      = is_nothrow_swappable_with<T, U>::value;
    template <class T> constexpr bool is_nothrow_swappable_v
      = is_nothrow_swappable<T>::value;

    template <class... T> struct common_type;
    template <class T, class U, template <class> class TQual, template <class> class UQual>
      struct basic_common_reference { };
    template <class... T> struct common_reference;

    template <class... T>
      using common_type_t = typename common_type<T...>::type;
    template <class... T>
      using common_reference_t = typename common_reference<T...>::type;

    }}}}

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