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62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// Copyright (C) 2001-2019 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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// 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// 25.3.3 [lib.alg.binary.search] Binary search algorithms.
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#include <algorithm>
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#include <testsuite_hooks.h>
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const int A[] = {1, 2, 3, 3, 3, 5, 8};
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const int C[] = {8, 5, 3, 3, 3, 2, 1};
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const int N = sizeof(A) / sizeof(int);
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// A comparison, equalivalent to std::greater<int> without the
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// dependency on <functional>.
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struct gt
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{
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bool
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operator()(const int& x, const int& y) const
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{ return x > y; }
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};
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// 25.3.3.4 binary_search, with and without comparison predicate
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void
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test04()
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{
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using std::binary_search;
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const int first = A[0];
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const int last = A[N - 1];
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VERIFY(binary_search(A, A + N, 5));
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VERIFY(binary_search(A, A + N, first));
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VERIFY(binary_search(A, A + N, last));
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VERIFY(!binary_search(A, A + N, 4));
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VERIFY(binary_search(C, C + N, 5, gt()));
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VERIFY(binary_search(C, C + N, first, gt()));
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VERIFY(binary_search(C, C + N, last, gt()));
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VERIFY(!binary_search(C, C + N, 4, gt()));
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}
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int
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main()
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{
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test04();
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return 0;
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}
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