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54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// { dg-options "-std=gnu++0x" }
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// Use smaller statistics when running on simulators, so it takes less time.
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// For powerpc-eabi, SAMPLES=30000 fails.
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// { dg-options "-std=gnu++0x -DSAMPLES=35000" { target simulator } }
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// Copyright (C) 2010-2014 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// This library 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 library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include "chi2_quality.h"
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// Tests chi^2 for a distribution of uniformly generated random strings.
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void
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test_uniform_random()
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{
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bool test __attribute__((unused)) = true;
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std::srand(137);
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std::unordered_set<std::string> set;
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std::string s;
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const unsigned long N = SAMPLES;
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const unsigned long k = N/100;
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const unsigned int len = 25;
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while (set.size() < N)
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{
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s.clear();
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for (unsigned int i = 0; i < len; ++i)
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s.push_back(rand() % 128);
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set.insert(s);
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}
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double chi2 = chi2_hash(set, k);
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VERIFY( chi2 < k*1.1 );
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}
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int
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main()
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{
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test_uniform_random();
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return 0;
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}
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