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// An Integral Constant is a class providing a compile-time value of an

// integral type.  An Integral Constant is also a nullary metafunction,

// returning itself.  An integral constant object is implicitly

// convertible to the associated value.

//

// A type n is a model of Integral Constant if it meets the following

// requirements:

//

// n::ValueType                : The integral type of n::value

// n::value                    : An integral constant expression

// n::type                     : IsSame<n::type, n>::value is true

// n::value_type const c = n() : c == n::value

// A model of the Integer Constant concept.

// T is an integral type, and is the value_type.

// v is an integral constant, and is the value.

template<typename T, T v>

struct IntegralConstant {

  typedef T value_type;

  static const value_type value = v;

  typedef IntegralConstant<T, v> type;

  operator value_type() { return value; }

};

// A bool valued IntegralConstant whose value is true.

typedef IntegralConstant<bool, true> TrueType;

// A bool valued IntegralConstant whose value is false.

typedef IntegralConstant<bool, false> FalseType;