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### is_reference

    template <class T>
    struct is_reference : public true_type-or-false_type {};

Inherits: If T is a reference pointer type then inherits from true_type, otherwise inherits from false_type.

C++ Standard Reference: 3.9.2 and 8.3.2.

Compiler Compatibility: If the compiler does not support partial-specialization of class templates, then this template may report the wrong result for function types, and for types that are both const and volatile qualified.

Header: `#include <boost/type_traits/is_reference.hpp>` or `#include <boost/type_traits.hpp>`

Examples:

> `is_reference<int&>` inherits from `true_type`.

> `is_reference<int const&>::type` is the type `true_type`.

> `is_reference<int (&)(long)>::value` is an integral constant expression that evaluates to true (the argument in this case is a reference to a function).

> `is_reference<T>::value_type` is the type `bool`.