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159 lines
4.6 KiB
159 lines
4.6 KiB
![]()
11 years ago
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/*
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* Copyright 2008-2012 NVIDIA Corporation
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*
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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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#include <thrust/random/linear_feedback_shift_engine.h>
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namespace thrust
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{
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namespace random
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{
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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linear_feedback_shift_engine<UIntType,w,k,q,s>
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::linear_feedback_shift_engine(result_type value)
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{
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seed(value);
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} // end linear_feedback_shift_engine::linear_feedback_shift_engine()
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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void linear_feedback_shift_engine<UIntType,w,k,q,s>
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::seed(result_type value)
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{
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m_value = value;
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} // end linear_feedback_shift_engine::seed()
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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typename linear_feedback_shift_engine<UIntType,w,k,q,s>::result_type
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linear_feedback_shift_engine<UIntType,w,k,q,s>
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::operator()(void)
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{
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const UIntType b = (((m_value << q) ^ m_value) & wordmask) >> (k-s);
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const UIntType mask = ( (~static_cast<UIntType>(0)) << (w-k) ) & wordmask;
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m_value = ((m_value & mask) << s) ^ b;
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return m_value;
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} // end linear_feedback_shift_engine::operator()()
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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void linear_feedback_shift_engine<UIntType,w,k,q,s>
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::discard(unsigned long long z)
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{
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for(; z > 0; --z)
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{
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this->operator()();
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} // end for
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} // end linear_feedback_shift_engine::discard()
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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template<typename CharT, typename Traits>
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std::basic_ostream<CharT,Traits>& linear_feedback_shift_engine<UIntType,w,k,q,s>
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::stream_out(std::basic_ostream<CharT,Traits> &os) const
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{
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typedef std::basic_ostream<CharT,Traits> ostream_type;
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typedef typename ostream_type::ios_base ios_base;
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// save old flags & fill character
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const typename ios_base::fmtflags flags = os.flags();
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const CharT fill = os.fill();
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os.flags(ios_base::dec | ios_base::fixed | ios_base::left);
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os.fill(os.widen(' '));
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// output one word of state
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os << m_value;
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// restore flags & fill character
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os.flags(flags);
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os.fill(fill);
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return os;
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}
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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template<typename CharT, typename Traits>
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std::basic_istream<CharT,Traits>& linear_feedback_shift_engine<UIntType,w,k,q,s>
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::stream_in(std::basic_istream<CharT,Traits> &is)
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{
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typedef std::basic_istream<CharT,Traits> istream_type;
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typedef typename istream_type::ios_base ios_base;
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// save old flags
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const typename ios_base::fmtflags flags = is.flags();
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is.flags(ios_base::skipws);
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// input one word of state
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is >> m_value;
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// restore flags
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is.flags(flags);
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return is;
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}
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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bool linear_feedback_shift_engine<UIntType,w,k,q,s>
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::equal(const linear_feedback_shift_engine<UIntType,w,k,q,s> &rhs) const
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{
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return m_value == rhs.m_value;
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}
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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bool operator==(const linear_feedback_shift_engine<UIntType,w,k,q,s> &lhs,
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const linear_feedback_shift_engine<UIntType,w,k,q,s> &rhs)
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{
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return thrust::random::detail::random_core_access::equal(lhs,rhs);
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}
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template<typename UIntType, size_t w, size_t k, size_t q, size_t s>
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bool operator!=(const linear_feedback_shift_engine<UIntType,w,k,q,s> &lhs,
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const linear_feedback_shift_engine<UIntType,w,k,q,s> &rhs)
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{
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return !(lhs == rhs);
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}
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template<typename UIntType_, size_t w_, size_t k_, size_t q_, size_t s_,
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typename CharT, typename Traits>
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std::basic_ostream<CharT,Traits>&
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operator<<(std::basic_ostream<CharT,Traits> &os,
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const linear_feedback_shift_engine<UIntType_,w_,k_,q_,s_> &e)
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{
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return thrust::random::detail::random_core_access::stream_out(os,e);
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}
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template<typename UIntType_, size_t w_, size_t k_, size_t q_, size_t s_,
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typename CharT, typename Traits>
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std::basic_istream<CharT,Traits>&
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operator>>(std::basic_istream<CharT,Traits> &is,
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linear_feedback_shift_engine<UIntType_,w_,k_,q_,s_> &e)
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{
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return thrust::random::detail::random_core_access::stream_in(is,e);
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}
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} // end random
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} // end thrust
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