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90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
// Copyright (C) 2001-2018 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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// 25.3.1 algorithms, sort()
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#include <algorithm>
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#include <testsuite_hooks.h>
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const int A[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20};
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const int B[] = {10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 17, 8, 18, 9, 19};
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const int C[] = {20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
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const int N = sizeof(A) / sizeof(int);
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const int logN = 3; // ln(N) rounded up
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const int P = 7;
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// comparison predicate for stable_sort: order by rightmost digit
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struct CompLast
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{
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bool
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operator()(const int x, const int y)
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{ return x % 10 < y % 10; }
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};
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// This functor has the equivalent functionality of std::geater<>,
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// but there is no dependency on <functional> and it also tracks the
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// number of invocations since creation.
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class Gt
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{
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public:
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static int count() { return itsCount; }
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static void reset() { itsCount = 0; }
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bool
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operator()(const int& x, const int& y)
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{
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++itsCount;
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return x > y;
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}
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private:
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static int itsCount;
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};
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int Gt::itsCount = 0;
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// 25.3.1.4 partial_sort_copy()
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void
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test04()
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{
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using std::partial_sort_copy;
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int s1[N];
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std::copy(B, B + N, s1);
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VERIFY(std::equal(s1, s1 + N, B));
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int s2[2*N];
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partial_sort_copy(s1, s1 + N, s2, s2 + P);
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VERIFY(std::equal(s2, s2 + P, A));
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Gt gt;
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gt.reset();
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partial_sort_copy(s1, s1 + N, s2, s2 + P, gt);
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VERIFY(std::equal(s2, s2 + P, C));
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VERIFY(std::equal(s2, partial_sort_copy(s1, s1 + N, s2, s2 + 2*N), A));
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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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