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-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11
12 // constexpr outer-iterator& outer-iterator::operator++();
13 // constexpr decltype(auto) outer-iterator::operator++(int);
14
15 // Note that corner cases are tested in `range.lazy.split/general.pass.cpp`.
16
17 #include <ranges>
18
19 #include <algorithm>
20 #include <cassert>
21 #include <string>
22 #include "../types.h"
23
test()24 constexpr bool test() {
25 using namespace std::string_literals;
26 // Can call `outer-iterator::operator++`; `View` is a forward range.
27 {
28 SplitViewForward v("abc def ghi", " ");
29
30 // ++i
31 {
32 auto i = v.begin();
33 assert(std::ranges::equal(*i, "abc"s));
34
35 decltype(auto) i2 = ++i;
36 static_assert(std::is_lvalue_reference_v<decltype(i2)>);
37 assert(&i2 == &i);
38 assert(std::ranges::equal(*i2, "def"s));
39 }
40
41 // i++
42 {
43 auto i = v.begin();
44 assert(std::ranges::equal(*i, "abc"s));
45
46 decltype(auto) i2 = i++;
47 static_assert(!std::is_reference_v<decltype(i2)>);
48 assert(std::ranges::equal(*i2, "abc"s));
49 assert(std::ranges::equal(*i, "def"s));
50 }
51 }
52
53 // Can call `outer-iterator::operator++`; `View` is an input range.
54 {
55 SplitViewInput v("abc def ghi", ' ');
56
57 // ++i
58 {
59 auto i = v.begin();
60 assert(std::ranges::equal(*i, "abc"s));
61
62 decltype(auto) i2 = ++i;
63 static_assert(std::is_lvalue_reference_v<decltype(i2)>);
64 assert(&i2 == &i);
65 assert(std::ranges::equal(*i2, "def"s));
66 }
67
68 // i++
69 {
70 auto i = v.begin();
71 assert(std::ranges::equal(*i, "abc"s));
72
73 static_assert(std::is_void_v<decltype(i++)>);
74 i++;
75 assert(std::ranges::equal(*i, "def"s));
76 }
77 }
78
79 return true;
80 }
81
main(int,char **)82 int main(int, char**) {
83 test();
84 static_assert(test());
85
86 return 0;
87 }
88