random.hpp

机甲指挥官2源代码

//===========================================================================//
// File:	random.cc                                                        //
// Contents: Interface specification for the random number generator         //
//---------------------------------------------------------------------------//
// Copyright (C) Microsoft Corporation. All rights reserved.                 //
//===========================================================================//

#pragma once

#include "Stuff.hpp"
#include "Scalar.hpp"

namespace Stuff {

	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Random ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	class Random
		#if defined(_ARMOR)
			: public Stuff::Signature
		#endif
	{
	public:
		static void
			InitializeClass();
		static void
			TerminateClass();

	private:
		static int
			Numbers[250];		// the random number table
		static int
			Index;					// the current entry within the table

		static void
			Init();

		static int
			GetRandomInt();

		Random()
			{Verify(Index == -1); Init();}

		static Random
			*Instance;

		void
			TestInstance() const {}

	public:
		//
		//------------------------
		// Random number functions
		//------------------------
		//
		static int
			GetInt()						// returns 0 .. RAND_MAX
				{return GetRandomInt();}
		static Scalar
			GetFraction();				// returns 0.0f <= x < 1.0f
		static int						// returns 0 .. Range-1
			GetLessThan(int Range);

		static bool
      	TestClass();
	};

	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Die ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	class Die
		#if defined(_ARMOR)
			: public Stuff::Signature
		#endif
	{
	private:
		int
			highestRandom,	// the highest random number giving a uniform dist.
			dieSides;		// the number of sides on the die (starting from 1)

	public:
		Die(int sides);
		operator int();	// returns 1 .. dieSides
	};

}