is_same

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### is_same

    template <class T, class U>
    struct is_same : public true_type-or-false_type {};

Inherits: If T and U are the same types then inherits from true_type, otherwise inherits from false_type.

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

Compiler Compatibility: If the compiler does not support partial-specialization of class templates, then this template can not be used with abstract, incomplete or function types.

Examples:

> `is_same<int, int>` inherits from `true_type`.

> `is_same<int, int>::type` is the type `true_type`.

> `is_same<int, int>::value` is an integral constant expression that evaluates to true.

> `is_same<int const, int>::value` is an integral constant expression that evaluates to false.

> `is_same<int&, int>::value` is an integral constant expression that evaluates to false.

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