forked from OSchip/llvm-project
133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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;
|
|
}
|