133 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// constexpr inner-iterator& inner-iterator::operator++();12//13// constexpr decltype(auto) inner-iterator::operator++(int);14 15#include <ranges>16 17#include <cassert>18#include <type_traits>19#include "test_macros.h"20#include "../types.h"21 22struct EmptyView : std::ranges::view_base {23 constexpr int* begin() const { return nullptr; }24 constexpr int* end() const { return nullptr; }25 constexpr static std::size_t size() { return 0; }26};27static_assert(std::ranges::forward_range<EmptyView>);28static_assert(std::ranges::view<EmptyView>);29LIBCPP_STATIC_ASSERT(std::ranges::__tiny_range<EmptyView>);30 31constexpr bool test() {32 // Can call `inner-iterator::operator++`; `View` is a forward range.33 {34 SplitViewForward v("abc def", " ");35 auto val = *v.begin();36 37 // ++i38 {39 auto i = val.begin();40 assert(*i == 'a');41 42 decltype(auto) i2 = ++i;43 static_assert(std::is_lvalue_reference_v<decltype(i2)>);44 assert(&i2 == &i);45 assert(*i2 == 'b');46 }47 48 // i++49 {50 auto i = val.begin();51 assert(*i == 'a');52 53 decltype(auto) i2 = i++;54 static_assert(!std::is_reference_v<decltype(i2)>);55 assert(*i2 == 'a');56 assert(*i == 'b');57 }58 }59 60 // Can call `inner-iterator::operator++`; `View` is an input range.61 {62 // ++i63 {64 SplitViewInput v("abc def", ' ');65 auto val = *v.begin();66 67 auto i = val.begin();68 assert(*i == 'a');69 70 decltype(auto) i2 = ++i;71 static_assert(std::is_lvalue_reference_v<decltype(i2)>);72 assert(&i2 == &i);73 assert(*i2 == 'b');74 }75 76 // i++77 {78 SplitViewInput v("abc def", ' ');79 auto val = *v.begin();80 81 auto i = val.begin();82 assert(*i == 'a');83 84 static_assert(std::is_void_v<decltype(i++)>);85 i++;86 assert(*i == 'b');87 }88 }89 90 // Can call `inner-iterator::operator++`; `View` is an input range and `Pattern` is an "empty" range.91 {92 // ++i93 {94 std::ranges::lazy_split_view<InputView, EmptyView> v("a", EmptyView());95 auto val = *v.begin();96 97 auto i = val.begin();98 assert(*i.base() == 'a');99 assert(i != std::default_sentinel);100 101 // The iterator doesn't move to the next character but is considered to point to the end.102 decltype(auto) i2 = ++i;103 assert(&i2 == &i);104 assert(*i2.base() == 'a');105 assert(i2 == std::default_sentinel);106 }107 108 // i++109 {110 std::ranges::lazy_split_view<InputView, EmptyView> v("a", EmptyView());111 auto val = *v.begin();112 113 auto i = val.begin();114 assert(*i.base() == 'a');115 assert(i != std::default_sentinel);116 117 // The iterator doesn't move to the next character but is considered to point to the end.118 i++;119 assert(*i.base() == 'a');120 assert(i == std::default_sentinel);121 }122 }123 124 return true;125}126 127int main(int, char**) {128 test();129 static_assert(test());130 131 return 0;132}133