mirror of
https://github.com/TrinityCore/TrinityCore.git
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100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
/*
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* Copyright (C) 2008-2015 TrinityCore <http://www.trinitycore.org/>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef Random_h__
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#define Random_h__
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#include "Define.h"
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#include "Duration.h"
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#include <limits>
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#include <random>
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/* Return a random number in the range min..max. */
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int32 irand(int32 min, int32 max);
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/* Return a random number in the range min..max (inclusive). */
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uint32 urand(uint32 min, uint32 max);
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/* Return a random millisecond value between min and max seconds. Functionally equivalent to urand(min*IN_MILLISECONDS, max*IN_MILLISECONDS). */
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uint32 urandms(uint32 min, uint32 max);
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/* Return a random number in the range 0 .. UINT32_MAX. */
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uint32 rand32();
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/* Return a random time in the range min..max (up to millisecond precision). Only works for values where millisecond difference is a valid uint32. */
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Milliseconds randtime(Milliseconds const& min, Milliseconds const& max);
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/* Return a random number in the range min..max */
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float frand(float min, float max);
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/* Return a random double from 0.0 to 1.0 (exclusive). */
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double rand_norm();
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/* Return a random double from 0.0 to 100.0 (exclusive). */
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double rand_chance();
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/* Return true if a random roll fits in the specified chance (range 0-100). */
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inline bool roll_chance_f(float chance)
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{
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return chance > rand_chance();
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}
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/* Return true if a random roll fits in the specified chance (range 0-100). */
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inline bool roll_chance_i(int chance)
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{
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return chance > irand(0, 99);
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}
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/*
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* SFMT wrapper satisfying UniformRandomNumberGenerator concept for use in <random> algorithms
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*/
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class SFMTEngine
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{
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public:
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typedef uint32 result_type;
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static TRINITY_CONSTEXPR result_type min() { return std::numeric_limits<result_type>::min(); }
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static TRINITY_CONSTEXPR result_type max() { return std::numeric_limits<result_type>::max(); }
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result_type operator()() const { return rand32(); }
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static SFMTEngine& Instance();
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};
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// Ugly, horrible, i don't even..., hack for VS2013 to work around missing discrete_distribution(iterator, iterator) constructor
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namespace Trinity
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{
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#if COMPILER == COMPILER_MICROSOFT && _MSC_VER <= 1800
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template<typename T>
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struct discrete_distribution_param : public std::discrete_distribution<T>::param_type
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{
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typedef typename std::discrete_distribution<T>::param_type base;
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template<typename InIt>
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discrete_distribution_param(InIt begin, InIt end) : base(_Noinit())
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{
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this->_Pvec.assign(begin, end);
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this->_Init();
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}
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};
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#else
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template<typename T>
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using discrete_distribution_param = typename std::discrete_distribution<T>::param_type;
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#endif
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}
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#endif // Random_h__
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