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template <class T>
struct add_rvalue_reference
{
   typedef see-below type;
};
        type: If T
        names an object or function type then the member typedef type shall name
        T&&;
        otherwise, type shall name T.
        [Note: This rule reflects the semantics of reference collapsing.
        For example, when a type T
        names a type U&, the type add_rvalue_reference<T>::type is not an rvalue reference. -end note].
      
C++ Standard Reference: 20.7.6.2.
        Header:  #include
        <boost/type_traits/add_rvalue_reference.hpp>
        or  #include <boost/type_traits.hpp>
      
Table 1.15. Examples
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Compiler Compatibility: In the absence of rvalue-reference support this trait has no effect.