// Copyright (C) 2006 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 2, 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 COPYING. If not, write to the Free // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, // USA. // 25.3.2 [lib.alg.nth.element] #include <vector> #include <algorithm> #include <testsuite_hooks.h> void test_set(std::vector<int>& v, int size) { v.clear(); for (int i = 0; i < size; i += 4) { v.push_back(i / 2); v.push_back((size - 2) - (i / 2)); } for (int i = 1; i < size; i += 2) v.push_back(i); } void do_test01(int size) { bool test __attribute__((unused)) = true; std::vector<int> v, s; for (int 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 (int i = 0; i < j; ++i) VERIFY( !(v[j] < v[i]) ); for (int i = j; i < v.size(); ++i) VERIFY( !(v[i] < v[j]) ); } } void test01() { for (int size = 4; size <= 1 << 10; size <<= 1) do_test01(size); } int main() { test01(); return 0; }