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UniformUIntDistribution.h
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UniformUIntDistribution.h
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// This file is part of LatNet Builder.
//
// Copyright (C) 2012-2021 The LatNet Builder author's, supervised by Pierre L'Ecuyer, Universite de Montreal.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef LATBUILDER__UNIFORM_UINT_DISTRIBUTION_H
#define LATBUILDER__UNIFORM_UINT_DISTRIBUTION_H
#include <limits>
#include <array>
#include <stdexcept>
#include <cstdint>
namespace LatBuilder {
template <typename UINTTYPE, typename RAND>
class UniformUIntDistribution
{
public:
UniformUIntDistribution(UINTTYPE a = 0, UINTTYPE b = 1):
m_lower(a),
m_upper(b),
m_range((b >= a) ? (b - a + 1) : 0)
{}
UINTTYPE operator()(RAND& rand)
{
if (m_range == 0)
{
return m_upper;
}
else
{
UINTTYPE reject_limit = rand.max() % m_range;
UINTTYPE n;
do
{
n = rand();
}
while (n <= reject_limit);
return (n % m_range) + m_lower;
}
}
void setLowerBound(UINTTYPE a)
{
setBounds(a, m_upper);
}
void setUpperBound(UINTTYPE b)
{
setBounds(m_lower, b);
}
void setBounds(UINTTYPE a, UINTTYPE b)
{
m_lower = a;
m_upper = b;
m_range = m_upper - m_lower + 1;
}
private:
UINTTYPE m_lower;
UINTTYPE m_upper;
UINTTYPE m_range;
};
}
#endif