libcxx/test/std/strings/basic.string/string.cons/brace_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<charT,traits,Allocator>&
  14 //   operator=(basic_string<charT,traits,Allocator>&& str); // constexpr since C++20
  15
  16 #include <string>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20 #include "asan_testing.h"
  21
  22 TEST_CONSTEXPR_CXX20 bool test() {
  23   // Test that assignment from {} and {ptr, len} are allowed and are not
  24   // ambiguous.
  25   {
  26     std::string s = "hello world";
  27     s             = {};
  28     assert(s.empty());
  29     LIBCPP_ASSERT(is_string_asan_correct(s));
  30   }
  31   {
  32     std::string s = "hello world";
  33     s             = {"abc", 2};
  34     assert(s == "ab");
  35     LIBCPP_ASSERT(is_string_asan_correct(s));
  36   }
  37   {
  38     std::string s = "hello world";
  39     s             = {"It'sALongString!NoSSO!qwertyuiop", 30};
  40     assert(s == "It'sALongString!NoSSO!qwertyui");
  41     LIBCPP_ASSERT(is_string_asan_correct(s));
  42   }
  43   {
  44     std::string s = "Hello world! Hello world! Hello world! Hello world! Hello world!";
  45     s             = {"It'sALongString!NoSSO!qwertyuiop", 30};
  46     assert(s == "It'sALongString!NoSSO!qwertyui");
  47     LIBCPP_ASSERT(is_string_asan_correct(s));
  48   }
  49   {
  50     std::string s = "Hello world! Hello world! Hello world! Hello world! Hello world!";
  51     s             = {"abc", 2};
  52     assert(s == "ab");
  53     LIBCPP_ASSERT(is_string_asan_correct(s));
  54   }
  55   {
  56     std::string s = "Hello world! Hello world! Hello world! Hello world! Hello world!";
  57     s             = {"abc", 0};
  58     assert(s == "");
  59     LIBCPP_ASSERT(is_string_asan_correct(s));
  60   }
  61
  62   return true;
  63 }
  64
  65 int main(int, char**) {
  66   test();
  67 #if TEST_STD_VER > 17
  68   static_assert(test());
  69 #endif
  70
  71   return 0;
  72 }