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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
//
//===----------------------------------------------------------------------===//
// <functional>
// UNSUPPORTED: c++03, c++11, c++14
// default searcher
// template<class _ForwardIterator, class _BinaryPredicate = equal_to<>>
// class default_searcher {
// public:
// default_searcher(_ForwardIterator __f, _ForwardIterator __l,
// _BinaryPredicate __p = _BinaryPredicate())
// : __first_(__f), __last_(__l), __pred_(__p) {}
//
// template <typename _ForwardIterator2>
// pair<_ForwardIterator2, _ForwardIterator2>
// operator () (_ForwardIterator2 __f, _ForwardIterator2 __l) const {
// return std::search(__f, __l, __first_, __last_, __pred_);
// }
//
// private:
// _ForwardIterator __first_;
// _ForwardIterator __last_;
// _BinaryPredicate __pred_;
// };
#include <algorithm>
#include <functional>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
struct count_equal
{
int *count;
template <class T>
TEST_CONSTEXPR_CXX14 bool operator()(const T& x, const T& y) const
{++*count; return x == y;}
};
template <typename Iter1, typename Iter2>
TEST_CONSTEXPR_CXX20
void do_search(Iter1 b1, Iter1 e1, Iter2 b2, Iter2 e2, Iter1 result) {
int count = 0;
std::default_searcher<Iter2, count_equal> s{b2, e2, count_equal{&count}};
assert(result == std::search(b1, e1, s));
auto d1 = std::distance(b1, e1);
auto d2 = std::distance(b2, e2);
assert((count >= 1) || (d2 == 0) || (d1 < d2));
assert((d1 < d2) || count <= d1 * (d1 - d2 + 1));
}
template <class Iter1, class Iter2>
TEST_CONSTEXPR_CXX20
bool test()
{
int ia[] = {0, 1, 2, 3, 4, 5};
const unsigned sa = sizeof(ia)/sizeof(ia[0]);
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia), Iter2(ia), Iter1(ia));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia), Iter2(ia+1), Iter1(ia));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia+1), Iter2(ia+2), Iter1(ia+1));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia+2), Iter2(ia+2), Iter1(ia));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia+2), Iter2(ia+3), Iter1(ia+2));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia+2), Iter2(ia+3), Iter1(ia+2));
do_search(Iter1(ia), Iter1(ia), Iter2(ia+2), Iter2(ia+3), Iter1(ia));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia+sa-1), Iter2(ia+sa), Iter1(ia+sa-1));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia+sa-3), Iter2(ia+sa), Iter1(ia+sa-3));
do_search(Iter1(ia), Iter1(ia+sa), Iter2(ia), Iter2(ia+sa), Iter1(ia));
do_search(Iter1(ia), Iter1(ia+sa-1), Iter2(ia), Iter2(ia+sa), Iter1(ia+sa-1));
do_search(Iter1(ia), Iter1(ia+1), Iter2(ia), Iter2(ia+sa), Iter1(ia+1));
int ib[] = {0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 4};
const unsigned sb = sizeof(ib)/sizeof(ib[0]);
int ic[] = {1};
do_search(Iter1(ib), Iter1(ib+sb), Iter2(ic), Iter2(ic+1), Iter1(ib+1));
int id[] = {1, 2};
do_search(Iter1(ib), Iter1(ib+sb), Iter2(id), Iter2(id+2), Iter1(ib+1));
int ie[] = {1, 2, 3};
do_search(Iter1(ib), Iter1(ib+sb), Iter2(ie), Iter2(ie+3), Iter1(ib+4));
int ig[] = {1, 2, 3, 4};
do_search(Iter1(ib), Iter1(ib+sb), Iter2(ig), Iter2(ig+4), Iter1(ib+8));
int ih[] = {0, 1, 1, 1, 1, 2, 3, 0, 1, 2, 3, 4};
const unsigned sh = sizeof(ih)/sizeof(ih[0]);
int ii[] = {1, 1, 2};
do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3));
return true;
}
int main(int, char**) {
test<forward_iterator<const int*>, forward_iterator<const int*> >();
test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
test<forward_iterator<const int*>, random_access_iterator<const int*> >();
test<bidirectional_iterator<const int*>, forward_iterator<const int*> >();
test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >();
test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >();
test<random_access_iterator<const int*>, forward_iterator<const int*> >();
test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
#if TEST_STD_VER >= 20
static_assert(test<forward_iterator<const int*>, forward_iterator<const int*>>());
static_assert(test<forward_iterator<const int*>, bidirectional_iterator<const int*>>());
static_assert(test<forward_iterator<const int*>, random_access_iterator<const int*>>());
static_assert(test<bidirectional_iterator<const int*>, forward_iterator<const int*>>());
static_assert(test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*>>());
static_assert(test<bidirectional_iterator<const int*>, random_access_iterator<const int*>>());
static_assert(test<random_access_iterator<const int*>, forward_iterator<const int*>>());
static_assert(test<random_access_iterator<const int*>, bidirectional_iterator<const int*>>());
static_assert(test<random_access_iterator<const int*>, random_access_iterator<const int*>>());
#endif
return 0;
}
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