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### add_lvalue_reference

    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

Expression | Result Type
--- | ---
`add_lvalue_reference<int>::type` | `int&`
`add_lvalue_reference<int const&>::type` | `int const&`
`add_lvalue_reference<int*>::type` | `int*&`
`add_lvalue_reference<int*&>::type` | `int*&`
`add_lvalue_reference<int&&>::type` | `int&`
`add_lvalue_reference<void>::type` | `void`

Compiler Compatibility: All current compilers are supported by this trait.