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85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/* EQEMu: Everquest Server Emulator
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Copyright (C) 2001-2014 EQEMu Development Team (http://eqemulator.net)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY except by those people which sell it, which
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are required to give you total support for your newly bought product;
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without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __random_h__
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#define __random_h__
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#include <random>
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#include <utility>
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/* This uses mt19937 seeded with the std::random_device
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* The idea is to have this be included as a member of another class
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* so mocking out for testing is easier
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* If you need to reseed random.Reseed()
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* Eventually this should be derived from an abstract base class
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*/
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namespace EQEmu {
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class Random {
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public:
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// AKA old MakeRandomInt
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const int Int(int low, int high)
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{
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if (low > high)
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std::swap(low, high);
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return std::uniform_int_distribution<int>(low, high)(m_gen); // [low, high]
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}
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// AKA old MakeRandomFloat
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const double Real(double low, double high)
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{
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if (low > high)
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std::swap(low, high);
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return std::uniform_real_distribution<double>(low, high)(m_gen); // [low, high)
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}
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// example Roll(50) would have a 50% success rate
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// Roll(100) 100%, etc
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// valid values 0-100 (well, higher works too but ...)
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const bool Roll(const int required)
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{
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return Int(0, 99) < required;
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}
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// valid values 0.0 - 1.0
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const bool Roll(const double required)
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{
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return Real(0.0, 1.0) <= required;
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}
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void Reseed()
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{
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// We could do the seed_seq thing here too if we need better seeding
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// but that is mostly overkill for us, so just seed once
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std::random_device rd;
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m_gen.seed(rd());
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}
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Random()
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{
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Reseed();
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}
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private:
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std::mt19937 m_gen;
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};
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}
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#endif /* !__random_h__ */
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