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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, EquivalenceRelation<auto, Iter::value_type> Pred>
// requires CopyConstructible<Pred>
// constexpr Iter // constexpr after C++17
// adjacent_find(Iter first, Iter last, Pred pred);
#include <algorithm>
#include <functional>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool eq (int a, int b) { return a == b; }
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
int ib[] = {0, 1, 2, 7, 0, 1, 2, 3};
return (std::adjacent_find(std::begin(ia), std::end(ia), eq) == ia+2)
&& (std::adjacent_find(std::begin(ib), std::end(ib), eq) == std::end(ib))
;
}
#endif
int main(int, char**)
{
int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
const unsigned sa = sizeof(ia)/sizeof(ia[0]);
assert(std::adjacent_find(forward_iterator<const int*>(ia),
forward_iterator<const int*>(ia + sa),
std::equal_to<int>()) ==
forward_iterator<const int*>(ia+2));
assert(std::adjacent_find(forward_iterator<const int*>(ia),
forward_iterator<const int*>(ia),
std::equal_to<int>()) ==
forward_iterator<const int*>(ia));
assert(std::adjacent_find(forward_iterator<const int*>(ia+3),
forward_iterator<const int*>(ia + sa),
std::equal_to<int>()) ==
forward_iterator<const int*>(ia+sa));
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
return 0;
}
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