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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<ForwardIterator Iter>
// requires LessThanComparable<Iter::value_type>
// Iter
// max_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)
{
Iter i = std::max_element(first, last);
if (first != last)
{
for (Iter j = first; j != last; ++j)
assert(!(*i < *j));
}
else
assert(i == 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);
}
#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::max_element(il,il+8);
static_assert ( *p == 8, "" );
#endif
}
int main(int, char**)
{
test<forward_iterator<const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
test<const int*>();
constexpr_test ();
return 0;
}
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