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### integral_constant

    template <class T, T val>
    struct integral_constant
    {
       typedef integral_constant<T, val>  type;
       typedef T                          value_type;
       static const T value = val;
       constexpr operator T()const;
    };

    typedef integral_constant<bool, true>  true_type;
    typedef integral_constant<bool, false> false_type;

Class template `integral_constant` is the common base class for all the value-based type traits. The two typedef's `true_type` and `false_type` are provided for convenience: most of the value traits are Boolean properties and so will inherit from one of these.