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### is_fundamental

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

Inherits: If T is a (possibly cv-qualified) fundamental type then inherits from true_type, otherwise inherits from false_type. Fundamental types include integral, floating point and void types (see also is_integral, is_floating_point and is_void)

C++ Standard Reference: 3.9.1.

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

Examples:

> `is_fundamental<int)>` inherits from `true_type`.

> `is_fundamental<double const>::type` is the type `true_type`.

> `is_fundamental<void>::value` is an integral constant expression that evaluates to true.

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