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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// constexpr inner-iterator& inner-iterator::operator++();
//
// constexpr decltype(auto) inner-iterator::operator++(int);
#include <ranges>
#include <cassert>
#include <type_traits>
#include "test_macros.h"
#include "../types.h"
struct EmptyView : std::ranges::view_base {
constexpr int* begin() const { return nullptr; }
constexpr int* end() const { return nullptr; }
constexpr static size_t size() { return 0; }
};
static_assert(std::ranges::forward_range<EmptyView>);
static_assert(std::ranges::view<EmptyView>);
LIBCPP_STATIC_ASSERT(std::ranges::__tiny_range<EmptyView>);
constexpr bool test() {
// Can call `inner-iterator::operator++`; `View` is a forward range.
{
SplitViewForward v("abc def", " ");
auto val = *v.begin();
// ++i
{
auto i = val.begin();
assert(*i == 'a');
decltype(auto) i2 = ++i;
static_assert(std::is_lvalue_reference_v<decltype(i2)>);
assert(&i2 == &i);
assert(*i2 == 'b');
}
// i++
{
auto i = val.begin();
assert(*i == 'a');
decltype(auto) i2 = i++;
static_assert(!std::is_reference_v<decltype(i2)>);
assert(*i2 == 'a');
assert(*i == 'b');
}
}
// Can call `inner-iterator::operator++`; `View` is an input range.
{
// ++i
{
SplitViewInput v("abc def", ' ');
auto val = *v.begin();
auto i = val.begin();
assert(*i == 'a');
decltype(auto) i2 = ++i;
static_assert(std::is_lvalue_reference_v<decltype(i2)>);
assert(&i2 == &i);
assert(*i2 == 'b');
}
// i++
{
SplitViewInput v("abc def", ' ');
auto val = *v.begin();
auto i = val.begin();
assert(*i == 'a');
static_assert(std::is_void_v<decltype(i++)>);
i++;
assert(*i == 'b');
}
}
// Can call `inner-iterator::operator++`; `View` is an input range and `Pattern` is an "empty" range.
{
// ++i
{
std::ranges::lazy_split_view<InputView, EmptyView> v("a", EmptyView());
auto val = *v.begin();
auto i = val.begin();
assert(*i.base() == 'a');
assert(i != std::default_sentinel);
// The iterator doesn't move to the next character but is considered to point to the end.
decltype(auto) i2 = ++i;
assert(&i2 == &i);
assert(*i2.base() == 'a');
assert(i2 == std::default_sentinel);
}
// i++
{
std::ranges::lazy_split_view<InputView, EmptyView> v("a", EmptyView());
auto val = *v.begin();
auto i = val.begin();
assert(*i.base() == 'a');
assert(i != std::default_sentinel);
// The iterator doesn't move to the next character but is considered to point to the end.
i++;
assert(*i.base() == 'a');
assert(i == std::default_sentinel);
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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