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template <class T>
struct add_lvalue_reference
{
   typedef see-below type;
};
template <class T> using add_lvalue_reference_t = typename add_lvalue_reference<T>::type; // C++11 and above
        type: If T
        names an object or function type then the member typedef type
        shall name T&;
        otherwise, if T names a type
        rvalue reference to U then the member typedef type shall
        name U&;
        otherwise, type shall name T.
      
C++ Standard Reference: 20.7.6.2.
        Header:  #include
        <boost/type_traits/add_lvalue_reference.hpp>
        or  #include <boost/type_traits.hpp>
      
Table 1.12. Examples
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Compiler Compatibility: All current compilers are supported by this trait.