67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
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/*
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* This file is part of Lucas' Bot.
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*
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* Lucas' Bot is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published
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* by the Free Software Foundation, either version 3 of the License,
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* or (at your option) any later version.
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Lucas' Bot 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 Affero General Public License
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for more details.
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You should have received a copy of the GNU Affero General Public License along
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with Lucas' Bot. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef MIRAICPPLUGIN_RANDOM_LIBRARY_H
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#define MIRAICPPLUGIN_RANDOM_LIBRARY_H
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#include <random>
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#include <type_traits>
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namespace RandomLibrary {
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std::default_random_engine e;
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void initialize() {
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static bool initialized = false;
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if (initialized)
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return;
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e.seed(std::random_device{}());
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initialized = true;
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}
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enum class RandomNumberType {
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UniformDistribution,
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NormalDistribution
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};
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template <typename TNum>
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TNum getNextRandomNumber(RandomNumberType type, TNum lowerBound, TNum upperBound) {
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static_assert(std::is_arithmetic_v<TNum>, "非算术类型不可用作本函数的参数！");
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initialize();
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if constexpr (std::is_integral_v<TNum>) {
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std::uniform_int_distribution<TNum> u(lowerBound, upperBound);
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return u(e);
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} else {
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if (type == RandomNumberType::UniformDistribution) {
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std::uniform_real_distribution<TNum> u(lowerBound, upperBound);
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return u(e);
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} else {
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std::normal_distribution<TNum> n(lowerBound, upperBound);
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return n(e);
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}
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}
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}
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bool getNextBoolean(double probability) {
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initialize();
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std::bernoulli_distribution b(probability);
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return b(e);
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}
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}
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#endif //MIRAICPPLUGIN_RANDOM_LIBRARY_H
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