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
11 // constexpr outer-iterator& outer-iterator::operator++();
12 // constexpr decltype(auto) outer-iterator::operator++(int);
13
14 // Note that corner cases are tested in `range.lazy.split/general.pass.cpp`.
15
16 #include <ranges>
17
18 #include <algorithm>
19 #include <cassert>
20 #include <string>
21 #include "../types.h"
22
test()23 constexpr bool test() {
24 using namespace std::string_literals;
25 // Can call `outer-iterator::operator++`; `View` is a forward range.
26 {
27 SplitViewForward v("abc def ghi", " ");
28
29 // ++i
30 {
31 auto i = v.begin();
32 assert(std::ranges::equal(*i, "abc"s));
33
34 decltype(auto) i2 = ++i;
35 static_assert(std::is_lvalue_reference_v<decltype(i2)>);
36 assert(&i2 == &i);
37 assert(std::ranges::equal(*i2, "def"s));
38 }
39
40 // i++
41 {
42 auto i = v.begin();
43 assert(std::ranges::equal(*i, "abc"s));
44
45 decltype(auto) i2 = i++;
46 static_assert(!std::is_reference_v<decltype(i2)>);
47 assert(std::ranges::equal(*i2, "abc"s));
48 assert(std::ranges::equal(*i, "def"s));
49 }
50 }
51
52 // Can call `outer-iterator::operator++`; `View` is an input range.
53 {
54 SplitViewInput v("abc def ghi", ' ');
55
56 // ++i
57 {
58 auto i = v.begin();
59 assert(std::ranges::equal(*i, "abc"s));
60
61 decltype(auto) i2 = ++i;
62 static_assert(std::is_lvalue_reference_v<decltype(i2)>);
63 assert(&i2 == &i);
64 assert(std::ranges::equal(*i2, "def"s));
65 }
66
67 // i++
68 {
69 auto i = v.begin();
70 assert(std::ranges::equal(*i, "abc"s));
71
72 static_assert(std::is_void_v<decltype(i++)>);
73 i++;
74 assert(std::ranges::equal(*i, "def"s));
75 }
76 }
77
78 return true;
79 }
80
main(int,char **)81 int main(int, char**) {
82 test();
83 static_assert(test());
84
85 return 0;
86 }
87