libcxx/test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.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-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>
  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>
  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
  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 }