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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
//
//===----------------------------------------------------------------------===//
// ADDITIONAL_COMPILE_FLAGS: -Wno-sign-compare
// <algorithm>
// template<InputIterator Iter, class T>
// requires HasEqualTo<Iter::value_type, T>
// constexpr Iter // constexpr after C++17
// find(Iter first, Iter last, const T& value);
#include <algorithm>
#include <cassert>
#include <vector>
#include <type_traits>
#include "test_macros.h"
#include "test_iterators.h"
#include "type_algorithms.h"
static std::vector<int> comparable_data;
template <class ArrayT, class CompareT>
struct Test {
template <class Iter>
TEST_CONSTEXPR_CXX20 void operator()() {
ArrayT arr[] = {
ArrayT(1), ArrayT(2), ArrayT(3), ArrayT(4), ArrayT(5), ArrayT(6), ArrayT(7), ArrayT(8), ArrayT(9), ArrayT(10)};
static_assert(std::is_same<decltype(std::find(Iter(arr), Iter(arr), 0)), Iter>::value, "");
{ // first element matches
Iter iter = std::find(Iter(arr), Iter(arr + 10), CompareT(1));
assert(*iter == ArrayT(1));
assert(base(iter) == arr);
}
{ // range is empty; return last
Iter iter = std::find(Iter(arr), Iter(arr), CompareT(1));
assert(base(iter) == arr);
}
{ // if multiple elements match, return the first match
ArrayT data[] = {
ArrayT(1), ArrayT(2), ArrayT(3), ArrayT(4), ArrayT(5), ArrayT(6), ArrayT(7), ArrayT(5), ArrayT(4)};
Iter iter = std::find(Iter(std::begin(data)), Iter(std::end(data)), CompareT(5));
assert(*iter == ArrayT(5));
assert(base(iter) == data + 4);
}
{ // some element matches
Iter iter = std::find(Iter(arr), Iter(arr + 10), CompareT(6));
assert(*iter == ArrayT(6));
assert(base(iter) == arr + 5);
}
{ // last element matches
Iter iter = std::find(Iter(arr), Iter(arr + 10), CompareT(10));
assert(*iter == ArrayT(10));
assert(base(iter) == arr + 9);
}
{ // if no element matches, last is returned
Iter iter = std::find(Iter(arr), Iter(arr + 10), CompareT(20));
assert(base(iter) == arr + 10);
}
if (!TEST_IS_CONSTANT_EVALUATED)
comparable_data.clear();
}
};
template <class IndexT>
class Comparable {
IndexT index_;
static IndexT init_index(IndexT i) {
IndexT size = static_cast<IndexT>(comparable_data.size());
comparable_data.push_back(i);
return size;
}
public:
Comparable(IndexT i) : index_(init_index(i)) {}
friend bool operator==(const Comparable& lhs, const Comparable& rhs) {
return comparable_data[lhs.index_] == comparable_data[rhs.index_];
}
};
#if TEST_STD_VER >= 20
template <class ElementT>
class TriviallyComparable {
ElementT el_;
public:
explicit constexpr TriviallyComparable(ElementT el) : el_(el) {}
bool operator==(const TriviallyComparable&) const = default;
};
#endif
template <class CompareT>
struct TestTypes {
template <class T>
TEST_CONSTEXPR_CXX20 void operator()() {
types::for_each(types::cpp17_input_iterator_list<T*>(), Test<T, CompareT>());
}
};
TEST_CONSTEXPR_CXX20 bool test() {
types::for_each(types::integer_types(), TestTypes<char>());
types::for_each(types::integer_types(), TestTypes<int>());
types::for_each(types::integer_types(), TestTypes<long long>());
#if TEST_STD_VER >= 20
Test<TriviallyComparable<char>, TriviallyComparable<char>>().operator()<TriviallyComparable<char>*>();
Test<TriviallyComparable<wchar_t>, TriviallyComparable<wchar_t>>().operator()<TriviallyComparable<wchar_t>*>();
#endif
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
Test<Comparable<char>, Comparable<char> >().operator()<Comparable<char>*>();
Test<Comparable<wchar_t>, Comparable<wchar_t> >().operator()<Comparable<wchar_t>*>();
return 0;
}
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