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### is_scalar

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

Inherits: If T is a (possibly cv-qualified) scalar type then inherits from true_type, otherwise inherits from false_type. Scalar types include integral, floating point, enumeration, pointer, and pointer-to-member types.

C++ Standard Reference: 3.9p10.

Header: `#include <boost/type_traits/is_scalar.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 function types.

Examples:

> `is_scalar<int*>` inherits from `true_type`.

> `is_scalar<int>::type` is the type `true_type`.

> `is_scalar<double>::value` is an integral constant expression that evaluates to true.

> `is_scalar<int (*)(long)>::value` is an integral constant expression that evaluates to true.

> `is_scalar<int (MyClass::*)(long)>::value` is an integral constant expression that evaluates to true.

> `is_scalar<int (MyClass::*)>::value` is an integral constant expression that evaluates to true.

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