Ichthyostega
b426ea4921
Since this is a much more complicated topic, for now I decided to establish two instances through global variables: * a sequence seeded with a fixed starting value * another sequence seeded from a true entropy source What we actually need however is some kind of execution framework to define points of random-seeding and to capture seed values for reproducible tests.
91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
/*
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random.cpp - storage and implementation for random number framework
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Copyright (C) Lumiera.org
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2024, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file random.cpp
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** Implementation details and common storage for random number generation.
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** @todo 3/2024 work out how some executions or performances are configured reproducibly.
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*/
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#include "lib/random.hpp"
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#include <string>
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using std::string;
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namespace lib {
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namespace {
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const string ENTROPY_SOURCE_SPEC{"/dev/random"};
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class EntropyNucleus
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: public SeedNucleus
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{
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std::random_device entropySource_;
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uint64_t
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getSeed() override
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{
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return entropySource_();
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}
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public:
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EntropyNucleus(string const& SPEC)
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: entropySource_{SPEC}
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{ }
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};
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class EternalNucleus
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: public SeedNucleus
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{
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uint64_t
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getSeed() override
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{
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return LIFE_AND_UNIVERSE_4EVER;
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}
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};
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/** static global entropy source instance */
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EntropyNucleus entropyNucleus{ENTROPY_SOURCE_SPEC};
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/// @todo this one should somehow be configurable
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EternalNucleus eternalNucleus;
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}
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SeedNucleus::~SeedNucleus() { }
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Random defaultGen{eternalNucleus};
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Random entropyGen{entropyNucleus};
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void
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randomiseRandomness()
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{
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entropyGen.randomise(entropyNucleus);
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defaultGen.randomise(entropyNucleus);
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}
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} // namespace lib
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