38 lines
802 B
C++
38 lines
802 B
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2016 Danny Robson <danny@nerdcruft.net>
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*/
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#include "mwc64x.hpp"
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#include "../debug/assert.hpp"
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using cruft::rand::mwc64x;
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///////////////////////////////////////////////////////////////////////////////
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mwc64x::mwc64x (seed_type _seed):
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m_state (_seed)
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{
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CHECK_NEZ (m_state);
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}
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///////////////////////////////////////////////////////////////////////////////
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mwc64x::result_type
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mwc64x::operator() (void)
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{
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CHECK_NEZ (m_state);
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uint32_t c = m_state >> 32u;
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uint32_t x = m_state & 0xFFFFFFFFu;
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m_state = x * 4294883355ULL + c;
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return x ^ c;
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}
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