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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>
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// template<input_iterator I, sentinel_for<I> S, class Proj = identity,
// indirectly_unary_invocable<projected<I, Proj>> Fun>
// constexpr ranges::for_each_result<I, Fun>
// ranges::for_each(I first, S last, Fun f, Proj proj = {});
// template<input_range R, class Proj = identity,
// indirectly_unary_invocable<projected<iterator_t<R>, Proj>> Fun>
// constexpr ranges::for_each_result<borrowed_iterator_t<R>, Fun>
// ranges::for_each(R&& r, Fun f, Proj proj = {});
#include <algorithm>
#include <ranges>
#include "almost_satisfies_types.h"
#include "test_iterators.h"
struct Callable {
void operator()(int);
};
template <class Iter, class Sent = Iter>
concept HasForEachIt = requires (Iter iter, Sent sent) { std::ranges::for_each(iter, sent, Callable{}); };
static_assert(HasForEachIt<int*>);
static_assert(!HasForEachIt<InputIteratorNotDerivedFrom>);
static_assert(!HasForEachIt<InputIteratorNotIndirectlyReadable>);
static_assert(!HasForEachIt<InputIteratorNotInputOrOutputIterator>);
static_assert(!HasForEachIt<int*, SentinelForNotSemiregular>);
static_assert(!HasForEachIt<int*, SentinelForNotWeaklyEqualityComparableWith>);
template <class Func>
concept HasForEachItFunc = requires(int* a, int* b, Func func) { std::ranges::for_each(a, b, func); };
static_assert(HasForEachItFunc<Callable>);
static_assert(!HasForEachItFunc<IndirectUnaryPredicateNotPredicate>);
static_assert(!HasForEachItFunc<IndirectUnaryPredicateNotCopyConstructible>);
template <class Range>
concept HasForEachR = requires (Range range) { std::ranges::for_each(range, Callable{}); };
static_assert(HasForEachR<UncheckedRange<int*>>);
static_assert(!HasForEachR<InputRangeNotDerivedFrom>);
static_assert(!HasForEachR<InputRangeNotIndirectlyReadable>);
static_assert(!HasForEachR<InputRangeNotInputOrOutputIterator>);
static_assert(!HasForEachR<InputRangeNotSentinelSemiregular>);
static_assert(!HasForEachR<InputRangeNotSentinelEqualityComparableWith>);
template <class Func>
concept HasForEachRFunc = requires(UncheckedRange<int*> a, Func func) { std::ranges::for_each(a, func); };
static_assert(HasForEachRFunc<Callable>);
static_assert(!HasForEachRFunc<IndirectUnaryPredicateNotPredicate>);
static_assert(!HasForEachRFunc<IndirectUnaryPredicateNotCopyConstructible>);
template <class Iter, class Sent = Iter>
constexpr void test_iterator() {
{ // simple test
{
auto func = [i = 0](int& a) mutable { a += i++; };
int a[] = {1, 6, 3, 4};
std::same_as<std::ranges::for_each_result<Iter, decltype(func)>> decltype(auto) ret =
std::ranges::for_each(Iter(a), Sent(Iter(a + 4)), func);
assert(a[0] == 1);
assert(a[1] == 7);
assert(a[2] == 5);
assert(a[3] == 7);
assert(base(ret.in) == a + 4);
int i = 0;
ret.fun(i);
assert(i == 4);
}
{
auto func = [i = 0](int& a) mutable { a += i++; };
int a[] = {1, 6, 3, 4};
auto range = std::ranges::subrange(Iter(a), Sent(Iter(a + 4)));
std::same_as<std::ranges::for_each_result<Iter, decltype(func)>> decltype(auto) ret =
std::ranges::for_each(range, func);
assert(a[0] == 1);
assert(a[1] == 7);
assert(a[2] == 5);
assert(a[3] == 7);
assert(base(ret.in) == a + 4);
int i = 0;
ret.fun(i);
assert(i == 4);
}
}
{ // check that an empty range works
{
int a[] = {};
std::ranges::for_each(Iter(a), Sent(Iter(a)), [](auto&) { assert(false); });
}
{
int a[] = {};
auto range = std::ranges::subrange(Iter(a), Sent(Iter(a)));
std::ranges::for_each(range, [](auto&) { assert(false); });
}
}
}
constexpr bool test() {
test_iterator<cpp17_input_iterator<int*>, sentinel_wrapper<cpp17_input_iterator<int*>>>();
test_iterator<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
test_iterator<forward_iterator<int*>>();
test_iterator<bidirectional_iterator<int*>>();
test_iterator<random_access_iterator<int*>>();
test_iterator<contiguous_iterator<int*>>();
test_iterator<int*>();
{ // check that std::invoke is used
struct S {
int check;
int other;
};
{
S a[] = {{1, 2}, {3, 4}, {5, 6}};
std::ranges::for_each(a, a + 3, [](int& i) { i = 0; }, &S::check);
assert(a[0].check == 0);
assert(a[0].other == 2);
assert(a[1].check == 0);
assert(a[1].other == 4);
assert(a[2].check == 0);
assert(a[2].other == 6);
}
{
S a[] = {{1, 2}, {3, 4}, {5, 6}};
std::ranges::for_each(a, [](int& i) { i = 0; }, &S::check);
assert(a[0].check == 0);
assert(a[0].other == 2);
assert(a[1].check == 0);
assert(a[1].other == 4);
assert(a[2].check == 0);
assert(a[2].other == 6);
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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