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https://github.com/worldforge/worldforge
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89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
// randgen.cpp (time and random number implementation)
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//
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// The WorldForge Project
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// Copyright (C) 2002 The WorldForge Project
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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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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//
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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// For information about WorldForge and its authors, please contact
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// the Worldforge Web Site at http://www.worldforge.org.
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// Author: Alistair Riddoch
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// Created: 2011-2-14
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#include <assert.h>
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#include "wfmath/randgen.h"
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#include <cstdio>
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#include <iostream>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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using WFMath::MTRand;
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bool test_known_sequence()
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{
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static WFMath::MTRand::uint32 expected_results[] = {
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2221777491u,
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2873750246u,
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4067173416u,
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794519497u,
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3287624630u,
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3357287912u,
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1212880927u,
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2464917741u,
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949382604u,
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1898004827u
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};
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WFMath::MTRand rng;
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bool result = true;
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rng.seed(23);
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for (int i = 0; i < 10; ++i)
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{
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WFMath::MTRand::uint32 rnd = rng.randInt();
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if (rnd != expected_results[i])
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{
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std::cerr << "Mismatch between MTRand and known result sequuence\n"
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<< rnd << " != " << expected_results[i] << std::endl;
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result = false;
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}
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assert(rnd == expected_results[i]);
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}
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return result;
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}
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bool test_generator_instances()
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{
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MTRand one(23);
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printf("%.16f %.16f\n", one.rand(), one.rand());
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float oneres = static_cast<float>(one.rand());
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MTRand two(23);
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printf("%.16f %.16f\n", two.rand<float>(), two.rand<float>());
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float twores = two.rand<float>();
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printf("%.16f %.16f\n", oneres, twores);
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return oneres == twores;
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}
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int main()
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{
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return !(test_known_sequence() && test_generator_instances());
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}
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