81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
// 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;
|
|
}
|