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81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef COMMON_RANDOM_H
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#define COMMON_RANDOM_H
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#include "common/scummsys.h"
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namespace Common {
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class String;
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/**
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* Simple random number generator. Although it is definitely not suitable for
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* cryptographic purposes, it serves our purposes just fine.
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*/
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class RandomSource {
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private:
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uint32 _randSeed;
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public:
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/**
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* Construct a new randomness source with the specific name.
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* The name used name must be globally unique, and is used to
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* register the randomness source with the active event recorder,
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* if any.
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*/
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RandomSource(const String &name);
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void setSeed(uint32 seed);
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uint32 getSeed() const {
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return _randSeed;
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}
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/**
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* Generates a random unsigned integer in the interval [0, max].
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* @param max the upper bound
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* @return a random number in the interval [0, max]
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*/
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uint getRandomNumber(uint max);
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/**
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* Generates a random bit, i.e. either 0 or 1.
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* Identical to getRandomNumber(1), but potentially faster.
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* @return a random bit, either 0 or 1
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*/
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uint getRandomBit();
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/**
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* Generates a random unsigned integer in the interval [min, max].
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* @param min the lower bound
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* @param max the upper bound
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* @return a random number in the interval [min, max]
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*/
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uint getRandomNumberRng(uint min, uint max);
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};
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} // End of namespace Common
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#endif
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