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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<ForwardIterator Iter>
// requires LessThanComparable<Iter::value_type>
// pair<Iter, Iter>
// minmax_element(Iter first, Iter last);
#include <algorithm>
#include <random>
#include <cassert>
#include "test_iterators.h"
std::mt19937 randomness;
template <class Iter>
void
test(Iter first, Iter last)
{
std::pair<Iter, Iter> p = std::minmax_element(first, last);
if (first != last)
{
for (Iter j = first; j != last; ++j)
{
assert(!(*j < *p.first));
assert(!(*p.second < *j));
}
}
else
{
assert(p.first == last);
assert(p.second == last);
}
}
template <class Iter>
void
test(int N)
{
int* a = new int[N];
for (int i = 0; i < N; ++i)
a[i] = i;
std::shuffle(a, a+N, randomness);
test(Iter(a), Iter(a+N));
delete [] a;
}
template <class Iter>
void
test()
{
test<Iter>(0);
test<Iter>(1);
test<Iter>(2);
test<Iter>(3);
test<Iter>(10);
test<Iter>(1000);
{
const int N = 100;
int* a = new int[N];
for (int i = 0; i < N; ++i)
a[i] = 5;
std::shuffle(a, a+N, randomness);
std::pair<Iter, Iter> p = std::minmax_element(Iter(a), Iter(a+N));
assert(base(p.first) == a);
assert(base(p.second) == a+N-1);
delete [] a;
}
}
#if TEST_STD_VER >= 14
constexpr int il[] = { 2, 4, 6, 8, 7, 5, 3, 1 };
#endif
void constexpr_test()
{
#if TEST_STD_VER >= 14
constexpr auto p = std::minmax_element(il, il+8);
static_assert ( *(p.first) == 1, "" );
static_assert ( *(p.second) == 8, "" );
#endif
}
int main()
{
test<forward_iterator<const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
test<const int*>();
constexpr_test();
}
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