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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libstdc++-v3/] [testsuite/] [25_algorithms/] [nth_element/] [2.cc] - Rev 424
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// Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING3. If not see // <http://www.gnu.org/licenses/>. // 25.3.2 [lib.alg.nth.element] // { dg-options "-DMAX_SIZE=256" { target simulator } } #ifndef MAX_SIZE #define MAX_SIZE (1 << 10) #endif #include <vector> #include <algorithm> #include <testsuite_hooks.h> void test_set(std::vector<unsigned>& v, unsigned size) { v.clear(); for (unsigned i = 0; i < size; i += 4) { v.push_back(i / 2); v.push_back((size - 2) - (i / 2)); } for (unsigned i = 1; i < size; i += 2) v.push_back(i); } void do_test01(unsigned size) { bool test __attribute__((unused)) = true; std::vector<unsigned> v, s; for (unsigned j = 0; j < size; ++j) { test_set(v, size); s = v; std::sort(s.begin(), s.end()); std::nth_element(v.begin(), v.begin() + j, v.end()); VERIFY( v[j] == s[j] ); for (unsigned i = 0; i < j; ++i) VERIFY( !(v[j] < v[i]) ); for (unsigned i = j; i < v.size(); ++i) VERIFY( !(v[i] < v[j]) ); } } void test01() { for (unsigned size = 4; size <= MAX_SIZE; size <<= 1) do_test01(size); } int main() { test01(); return 0; }