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### is_integral

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

Inherits: If T is a (possibly cv-qualified) integral type then inherits from true_type, otherwise inherits from false_type.

C++ Standard Reference: 3.9.1p7.

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

Examples:

> `is_integral<int>` inherits from `true_type`.

> `is_integral<const char>::type` is the type `true_type`.

> `is_integral<long>::value` is an integral constant expression that evaluates to true.

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