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template <class T>
struct is_nothrow_swappable : public true_type-or-false_type {};
        Inherits: If the expression swap(declval<T&>(),
        declval<T&>())
        (in a context where std::swap is visible) is valid and non-throwing,
        inherits from true_type,
        otherwise from false_type.
      
Compiler Compatibility: This trait requires C++11 for full support. Without C++11 it will inherit from true_type for scalar types (including integral, floating point, enumeration, pointer and pointer-to-member types), and from false_type for anything else.
        Header:  #include
        <boost/type_traits/is_nothrow_swappable.hpp>
        or  #include <boost/type_traits.hpp>