forked from 0ad/0ad
Ykkrosh
7c2e9027c2
Giant merge from http://svn.wildfiregames.com/hg-source/file/5fb522019d5e Infrastructure is largely complete, gameplay is largely missing Disabled by default; use command-line flag "-sim2" (Second attempt at commit...) This was SVN commit r7259.
87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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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* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "lib/self_test.h"
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#include "maths/Sqrt.h"
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#include <boost/random.hpp>
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class TestSqrt : public CxxTest::TestSuite
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{
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public:
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void t(u32 n)
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{
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TS_ASSERT_EQUALS(isqrt64((u64)n*(u64)n), n);
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}
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void s(u64 n, u64 exp)
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{
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TS_ASSERT_EQUALS((u64)isqrt64(n), exp);
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}
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void test_sqrt()
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{
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t(0);
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t(1);
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t(2);
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t(255);
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t(256);
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t(257);
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t(65535);
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t(65536);
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t(65537);
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t(16777215);
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t(16777216);
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t(16777217);
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t(2147483647);
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t(2147483648u);
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t(2147483649u);
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t(4294967295u);
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s(2, 1);
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s(3, 1);
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s(4, 2);
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s(255, 15);
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s(256, 16);
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s(257, 16);
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s(65535, 255);
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s(65536, 256);
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s(65537, 256);
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s(999999, 999);
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s(1000000, 1000);
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s(1000001, 1000);
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s((u64)-1, 4294967295u);
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}
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void test_random()
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{
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// Test with some random u64s, to make sure the output agrees with floor(sqrt(double))
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// (TODO: This might be making non-portable assumptions about sqrt(double))
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boost::mt19937 rng;
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boost::uniform_int<u64> ints(0, (u64)-1);
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boost::variate_generator<boost::mt19937&, boost::uniform_int<u64> > gen(rng, ints);
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for (size_t i = 0; i < 1024; ++i)
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{
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u64 n = gen();
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s(n, (u64)sqrt((double)n));
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}
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}
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};
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