Current File : //usr/lib/python3/dist-packages/pythran/pythonic/include/numpy/random/generator.hpp
#ifndef PYTHONIC_INCLUDE_NUMPY_RANDOM_GENERATOR_HPP
#define PYTHONIC_INCLUDE_NUMPY_RANDOM_GENERATOR_HPP
#include <random>
PYTHONIC_NS_BEGIN
namespace numpy
{
namespace random
{
namespace details
{
/*
* PCG Random Number Generation for C.
*
* Copyright 2014 Melissa O'Neill <oneill@pcg-random.org>
*
* 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.
*
* For additional information about the PCG random number generation
*scheme,
* including its license and other licensing options, visit
*
* http://www.pcg-random.org
*/
class pcg
{
uint64_t state;
static constexpr uint64_t inc = 0xda3e39cb94b95bdbULL;
public:
using result_type = uint32_t;
static constexpr result_type min()
{
return 0;
}
static constexpr result_type max()
{
return std::numeric_limits<uint32_t>::max();
}
friend bool operator==(pcg const &self, pcg const &other)
{
return self.state == other.state;
}
friend bool operator!=(pcg const &self, pcg const &other)
{
return self.state != other.state;
}
pcg() : state(0)
{
}
explicit pcg(std::random_device &rd)
{
seed(rd());
}
void seed(uint64_t value = 0)
{
state = value;
(void)operator()();
}
result_type operator()()
{
uint64_t oldstate = state;
state = oldstate * 6364136223846793005ULL + inc;
uint32_t xorshifted = uint32_t(((oldstate >> 18u) ^ oldstate) >> 27u);
int rot = oldstate >> 59u;
return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
}
void discard(std::size_t n)
{
for (std::size_t i = 0; i < n; ++i)
operator()();
}
private:
};
std::random_device rd;
pcg generator(rd);
} // namespace details
} // namespace random
}
PYTHONIC_NS_END
#endif
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