xref: /llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp (revision 2da049a1418f7a2f96e7cac4368cac3ce8667d2e)
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
10 // TODO: Change to XFAIL once https://github.com/llvm/llvm-project/issues/40340 is fixed
11 // UNSUPPORTED: availability-pmr-missing
12 
13 // <string>
14 
15 // namespace std::pmr {
16 // template <class Char, class Traits = ...>
17 // using basic_string =
18 //     ::std::basic_string<Char, Traits, polymorphic_allocator<Char>>
19 //
20 // typedef ... string
21 // typedef ... u16string
22 // typedef ... u32string
23 // typedef ... wstring
24 //
25 // } // namespace std::pmr
26 
27 #include <string>
28 #include <cassert>
29 #include <memory_resource>
30 #include <type_traits>
31 
32 #include "constexpr_char_traits.h"
33 #include "test_macros.h"
34 
35 template <class Char, class PmrTypedef>
test_string_typedef()36 void test_string_typedef() {
37   using StdStr = std::basic_string<Char, std::char_traits<Char>, std::pmr::polymorphic_allocator<Char>>;
38   using PmrStr = std::pmr::basic_string<Char>;
39   static_assert(std::is_same<StdStr, PmrStr>::value, "");
40   static_assert(std::is_same<PmrStr, PmrTypedef>::value, "");
41 }
42 
43 template <class Char, class Traits>
test_basic_string_alias()44 void test_basic_string_alias() {
45   using StdStr = std::basic_string<Char, Traits, std::pmr::polymorphic_allocator<Char>>;
46   using PmrStr = std::pmr::basic_string<Char, Traits>;
47   static_assert(std::is_same<StdStr, PmrStr>::value, "");
48 }
49 
main(int,char **)50 int main(int, char**) {
51   {
52     test_string_typedef<char, std::pmr::string>();
53 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
54     test_string_typedef<wchar_t, std::pmr::wstring>();
55 #endif
56     test_string_typedef<char16_t, std::pmr::u16string>();
57     test_string_typedef<char32_t, std::pmr::u32string>();
58   }
59   {
60     test_basic_string_alias<char, constexpr_char_traits<char>>();
61 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
62     test_basic_string_alias<wchar_t, constexpr_char_traits<wchar_t>>();
63 #endif
64     test_basic_string_alias<char16_t, constexpr_char_traits<char16_t>>();
65     test_basic_string_alias<char32_t, constexpr_char_traits<char32_t>>();
66   }
67   {
68     // Check that std::basic_string has been included and is complete.
69     std::pmr::string s;
70     assert(s.get_allocator().resource() == std::pmr::get_default_resource());
71   }
72 
73   return 0;
74 }
75