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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<class ForwardIterator, class Size, class T, class BinaryPredicate>
// constexpr ForwardIterator // constexpr after C++17
// search_n(ForwardIterator first, ForwardIterator last, Size count,
// const T& value, BinaryPredicate pred);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "user_defined_integral.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, 0, 1, 1, 2, 2};
return (std::search_n(std::begin(ia), std::end(ia), 1, 0, eq) == ia)
&& (std::search_n(std::begin(ia), std::end(ia), 2, 1, eq) == ia+2)
&& (std::search_n(std::begin(ia), std::end(ia), 1, 3, eq) == std::end(ia))
;
}
#endif
struct count_equal
{
static unsigned count;
template <class T>
bool operator()(const T& x, const T& y)
{++count; return x == y;}
};
unsigned count_equal::count = 0;
template <class Iter>
void
test()
{
int ia[] = {0, 1, 2, 3, 4, 5};
const unsigned sa = sizeof(ia)/sizeof(ia[0]);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 0, 0, count_equal()) == Iter(ia));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 1, 0, count_equal()) == Iter(ia+0));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 2, 0, count_equal()) == Iter(ia+sa));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), sa, 0, count_equal()) == Iter(ia+sa));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 0, 3, count_equal()) == Iter(ia));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 1, 3, count_equal()) == Iter(ia+3));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 2, 3, count_equal()) == Iter(ia+sa));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), sa, 3, count_equal()) == Iter(ia+sa));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 0, 5, count_equal()) == Iter(ia));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 1, 5, count_equal()) == Iter(ia+5));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), 2, 5, count_equal()) == Iter(ia+sa));
assert(count_equal::count <= sa);
count_equal::count = 0;
assert(std::search_n(Iter(ia), Iter(ia+sa), sa, 5, count_equal()) == Iter(ia+sa));
assert(count_equal::count <= sa);
count_equal::count = 0;
int ib[] = {0, 0, 1, 1, 2, 2};
const unsigned sb = sizeof(ib)/sizeof(ib[0]);
assert(std::search_n(Iter(ib), Iter(ib+sb), 0, 0, count_equal()) == Iter(ib));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 1, 0, count_equal()) == Iter(ib+0));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 2, 0, count_equal()) == Iter(ib+0));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 3, 0, count_equal()) == Iter(ib+sb));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), sb, 0, count_equal()) == Iter(ib+sb));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 0, 1, count_equal()) == Iter(ib));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 1, 1, count_equal()) == Iter(ib+2));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 2, 1, count_equal()) == Iter(ib+2));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 3, 1, count_equal()) == Iter(ib+sb));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), sb, 1, count_equal()) == Iter(ib+sb));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 0, 2, count_equal()) == Iter(ib));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 1, 2, count_equal()) == Iter(ib+4));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 2, 2, count_equal()) == Iter(ib+4));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), 3, 2, count_equal()) == Iter(ib+sb));
assert(count_equal::count <= sb);
count_equal::count = 0;
assert(std::search_n(Iter(ib), Iter(ib+sb), sb, 2, count_equal()) == Iter(ib+sb));
assert(count_equal::count <= sb);
count_equal::count = 0;
int ic[] = {0, 0, 0};
const unsigned sc = sizeof(ic)/sizeof(ic[0]);
assert(std::search_n(Iter(ic), Iter(ic+sc), 0, 0, count_equal()) == Iter(ic));
assert(count_equal::count <= sc);
count_equal::count = 0;
assert(std::search_n(Iter(ic), Iter(ic+sc), 1, 0, count_equal()) == Iter(ic));
assert(count_equal::count <= sc);
count_equal::count = 0;
assert(std::search_n(Iter(ic), Iter(ic+sc), 2, 0, count_equal()) == Iter(ic));
assert(count_equal::count <= sc);
count_equal::count = 0;
assert(std::search_n(Iter(ic), Iter(ic+sc), 3, 0, count_equal()) == Iter(ic));
assert(count_equal::count <= sc);
count_equal::count = 0;
assert(std::search_n(Iter(ic), Iter(ic+sc), 4, 0, count_equal()) == Iter(ic+sc));
assert(count_equal::count <= sc);
count_equal::count = 0;
// Check that we properly convert the size argument to an integral.
TEST_IGNORE_NODISCARD std::search_n(Iter(ic), Iter(ic+sc), UserDefinedIntegral<unsigned>(4), 0, count_equal());
count_equal::count = 0;
}
class A {
public:
A(int x, int y) : x_(x), y_(y) {}
int x() const { return x_; }
int y() const { return y_; }
private:
int x_;
int y_;
};
struct Pred {
bool operator()(const A& l, int r) const { return l.x() == r; }
};
int main(int, char**)
{
test<forward_iterator<const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
// test bug reported in https://reviews.llvm.org/D124079?#3661721
{
A a[] = {A(1, 2), A(2, 3), A(2, 4)};
int value = 2;
auto result = std::search_n(a, a + 3, 1, value, Pred());
assert(result == a + 1);
}
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
return 0;
}
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