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: no-filesystem, no-localization, no-tzdb
11
12 // XFAIL: libcpp-has-no-experimental-tzdb
13 // XFAIL: availability-tzdb-missing
14
15 // <chrono>
16 //
17 // class tzdb_list;
18 //
19 // const_iterator erase_after(const_iterator p);
20
21 #include <cassert>
22 #include <chrono>
23 #include <fstream>
24 #include <iterator>
25
26 #include "filesystem_test_helper.h"
27 #include "test_macros.h"
28 #include "test_tzdb.h"
29
30 scoped_test_env env;
31 [[maybe_unused]] const std::filesystem::path dir = env.create_dir("zoneinfo");
32 const std::filesystem::path data = env.create_file("zoneinfo/tzdata.zi");
33
__libcpp_tzdb_directory()34 std::string_view std::chrono::__libcpp_tzdb_directory() {
35 static std::string result = dir.string();
36 return result;
37 }
38
write(std::string_view input)39 static void write(std::string_view input) { std::ofstream{data}.write(input.data(), input.size()); }
40
main(int,const char **)41 int main(int, const char**) {
42 write("# version 1");
43 std::chrono::tzdb_list& list = std::chrono::get_tzdb_list(); // [1]
44
45 write("# version 2");
46 std::chrono::reload_tzdb(); // [2, 1]
47
48 assert(std::distance(list.begin(), list.end()) == 2);
49 assert(list.front().version == "2");
50
51 list.erase_after(list.begin()); // [2]
52 assert(std::distance(list.begin(), list.end()) == 1);
53 assert(list.front().version == "2");
54
55 write("# version 3");
56 std::chrono::reload_tzdb(); // [3, 2]
57 assert(std::distance(list.begin(), list.end()) == 2);
58
59 write("# version 4");
60 std::chrono::reload_tzdb(); // [4, 3, 2]
61 assert(std::distance(list.begin(), list.end()) == 3);
62 assert(list.front().version == "4");
63
64 std::chrono::tzdb_list::const_iterator it = ++list.begin();
65 assert(it->version == "3");
66
67 list.erase_after(it); // [4, 3]
68 assert(std::distance(list.begin(), list.end()) == 2);
69 assert(list.front().version == "4");
70 assert(it->version == "3");
71 }
72