libcruft-util/rand/xorshift.hpp

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/*
* 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.
*
* Copyright 2015-2016 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_RAND_XORSHIFT_HPP
#define __UTIL_RAND_XORSHIFT_HPP
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namespace util::rand {
// implements a naive xorshift random generator.
//
// * does not comply with the c++11 rng class requirements
// * users may not rely on identical output across executions or library
// updates. internal constants may change across releases
template <typename T>
struct xorshift {
public:
using result_type = T;
xorshift (T seed);
result_type operator() (void);
static result_type min (void);
static result_type max (void);
void discard (unsigned);
private:
T m_state;
};
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}
#endif