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### is_array

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

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

C++ Standard Reference: 3.9.2 and 8.3.4.

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

Compiler Compatibility: If the compiler does not support partial-specialization of class templates, then this template can give the wrong result with function types.

Examples:

> `is_array<int[2]>` inherits from `true_type`.

> `is_array<char[2][3]>::type` is the type `true_type`.

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

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