134 lines
3.3 KiB
C++
134 lines
3.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// constexpr inner-iterator& inner-iterator::operator++();
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//
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// constexpr decltype(auto) inner-iterator::operator++(int);
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#include <ranges>
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#include <cassert>
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#include <type_traits>
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#include "test_macros.h"
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#include "../types.h"
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struct EmptyView : std::ranges::view_base {
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constexpr int* begin() const { return nullptr; }
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constexpr int* end() const { return nullptr; }
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constexpr static size_t size() { return 0; }
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};
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static_assert(std::ranges::forward_range<EmptyView>);
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static_assert(std::ranges::view<EmptyView>);
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LIBCPP_STATIC_ASSERT(std::ranges::__tiny_range<EmptyView>);
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constexpr bool test() {
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// Can call `inner-iterator::operator++`; `View` is a forward range.
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{
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SplitViewForward v("abc def", " ");
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auto val = *v.begin();
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// ++i
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{
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auto i = val.begin();
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assert(*i == 'a');
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decltype(auto) i2 = ++i;
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static_assert(std::is_lvalue_reference_v<decltype(i2)>);
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assert(&i2 == &i);
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assert(*i2 == 'b');
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}
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// i++
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{
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auto i = val.begin();
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assert(*i == 'a');
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decltype(auto) i2 = i++;
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static_assert(!std::is_reference_v<decltype(i2)>);
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assert(*i2 == 'a');
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assert(*i == 'b');
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}
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}
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// Can call `inner-iterator::operator++`; `View` is an input range.
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{
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// ++i
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{
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SplitViewInput v("abc def", ' ');
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auto val = *v.begin();
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auto i = val.begin();
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assert(*i == 'a');
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decltype(auto) i2 = ++i;
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static_assert(std::is_lvalue_reference_v<decltype(i2)>);
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assert(&i2 == &i);
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assert(*i2 == 'b');
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}
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// i++
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{
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SplitViewInput v("abc def", ' ');
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auto val = *v.begin();
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auto i = val.begin();
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assert(*i == 'a');
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static_assert(std::is_void_v<decltype(i++)>);
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i++;
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assert(*i == 'b');
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}
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}
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// Can call `inner-iterator::operator++`; `View` is an input range and `Pattern` is an "empty" range.
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{
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// ++i
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{
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std::ranges::lazy_split_view<InputView, EmptyView> v("a", EmptyView());
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auto val = *v.begin();
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auto i = val.begin();
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assert(*i.base() == 'a');
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assert(i != std::default_sentinel);
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// The iterator doesn't move to the next character but is considered to point to the end.
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decltype(auto) i2 = ++i;
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assert(&i2 == &i);
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assert(*i2.base() == 'a');
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assert(i2 == std::default_sentinel);
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}
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// i++
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{
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std::ranges::lazy_split_view<InputView, EmptyView> v("a", EmptyView());
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auto val = *v.begin();
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auto i = val.begin();
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assert(*i.base() == 'a');
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assert(i != std::default_sentinel);
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// The iterator doesn't move to the next character but is considered to point to the end.
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i++;
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assert(*i.base() == 'a');
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assert(i == std::default_sentinel);
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}
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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