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### is_nothrow_swappable

    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>`