///\file

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.

Copyright(c) 2014 jwellbelove

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of this software and associated documentation files(the "Software"), to deal
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******************************************************************************/

#ifndef __etl_largest__
#define __etl_largest__

///\defgroup largest largest
///\ingroup utilities

namespace etl 
{
	//***************************************************************************
	/// Template to determine the largest type and size.
  /// Supports up to 16 types.
	/// Defines 'value_type' which is the type of the largest parameter.
	/// Defines 'size' which is the size of the largest parameter.
  ///\ingroup numeric
	//***************************************************************************
	template <typename T1,         typename T2  = void, typename T3  = void, typename T4  = void,
			      typename T5  = void, typename T6  = void, typename T7  = void, typename T8  = void,
			      typename T9  = void, typename T10 = void, typename T11 = void, typename T12 = void,
			      typename T13 = void, typename T14 = void, typename T15 = void, typename T16 = void>
	struct largest
	{
	private:

    // Declaration.
		template <const bool Boolean, typename TrueType, typename FalseType>
		struct choose_type;

    // Specialisation for 'true'.
    // Defines 'type' as 'TrueType'.
    template <typename TrueType, typename FalseType>
    struct choose_type<true, TrueType, FalseType>
    {
      typedef TrueType type;
    };

		// Specialisation for 'false'. 
    // Defines 'type' as 'FalseType'.
    template <typename TrueType, typename FalseType>
    struct choose_type<false, TrueType, FalseType>
		{
      typedef FalseType type;
		};

	public:

		// Define 'largest_other' as 'largest' with all but the first parameter. 
		typedef typename largest<T2,  T3,  T4,  T5,  T6,  T7,  T8,  T9,  T10, T11, T12, T13, T14, T15, T16>::type largest_other;

		// Set 'type' to be the largest of the first parameter and any of the others.
    // This is recursive.
    typedef typename choose_type<(sizeof(T1) > sizeof(largest_other)), // Boolean
									               T1,                                   // TrueType
									               largest_other>                        // FalseType
									               ::type type;                          // The largest type of the two.

		// The size of the largest type.
		enum
		{
			size = sizeof(type)
		};
	};

  //***************************************************************************
	// Specialisation for one template parameter.
	//***************************************************************************
	template <typename T1>
	struct largest<T1,   void, void, void,
					       void, void, void, void, 
					       void, void, void, void, 
					       void, void, void, void>
	{
		typedef T1 type;

		enum
		{
			size = sizeof(type)
		};
	};
}

#endif