46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015-2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_RAND_XORSHIFT_HPP
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#define __UTIL_RAND_XORSHIFT_HPP
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namespace util { namespace rand {
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// implements a naive xorshift random generator.
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//
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// * does not comply with the c++11 rng class requirements
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// * users may not rely on identical output across executions or library
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// updates. internal constants may change across releases
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template <typename T>
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struct xorshift {
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public:
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using result_type = T;
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xorshift (T seed);
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result_type operator() (void);
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static result_type min (void);
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static result_type max (void);
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void discard (unsigned);
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private:
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T m_state;
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};
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} }
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#endif
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