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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* random.h
*
* Wed Mar 23 19:17:24 CET 2016
* Copyright 2016 André Nusser
* andre.nusser@googlemail.com
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include <random>
#include <vector>
class Random
{
public:
Random();
Random(unsigned int seed);
void setSeed(unsigned int seed);
//! \return random int in range [<lower_bound>, <upper_bound>].
int intInRange(int lower_bound, int upper_bound);
//! \return random float in range [<lower_bound>, <upper_bound>].
float floatInRange(float lower_bound, float upper_bound);
//! \return random float drawn from a normal distribution with mean <mean>
//! and standard deviation <stddev>.
float normalDistribution(float mean, float stddev);
//! \return uniformly at random chosen element from <vec>.
template <typename T>
T& choose(std::vector<T>& vec);
private:
// The std::default_random_engine of the gcc libstdc++ library is
// minstd_rand0, so make sure we use that all platforms regardless of which
// stdlib we link with.
std::minstd_rand0 generator;
float generateFloat();
};
template <typename T>
T& Random::choose(std::vector<T>& vec)
{
return vec[intInRange(0, vec.size() - 1)];
}
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