libcxx/test/std/strings/basic.string/string.cons/initializer_list_assignment.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
  10
  11 // <string>
  12
  13 // basic_string& operator=(initializer_list<charT> il); // constexpr since C++20
  14
  15 #include <string>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20
  21 // clang-format off
  22 template <template <class> class Alloc>
  23 TEST_CONSTEXPR_CXX20 void test_string() {
  24   {
  25     typedef std::basic_string<char, std::char_traits<char>, Alloc<char>> S;
  26     S s;
  27     S& result = (s = {'a', 'b', 'c'});
  28     assert(s == "abc");
  29     assert(&result == &s);
  30   }
  31 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  32   {
  33     typedef std::basic_string<wchar_t, std::char_traits<wchar_t>, Alloc<wchar_t>> S;
  34     S s;
  35     S& result = (s = {L'a', L'b', L'c'});
  36     assert(s == L"abc");
  37     assert(&result == &s);
  38   }
  39 #endif
  40 }
  41 // clang-format on
  42
  43 TEST_CONSTEXPR_CXX20 bool test() {
  44   test_string<std::allocator>();
  45   test_string<min_allocator>();
  46
  47   return true;
  48 }
  49
  50 int main(int, char**) {
  51   test();
  52 #if TEST_STD_VER > 17
  53   static_assert(test());
  54 #endif
  55
  56   return 0;
  57 }