libcxx/test/std/strings/basic.string/string.cons/copy_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 // <string>
  10
  11 // basic_string<charT,traits,Allocator>&
  12 //   operator=(const basic_string<charT,traits,Allocator>& str); // constexpr since C++20
  13
  14 #include <string>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18 #include "min_allocator.h"
  19
  20 template <class S>
  21 TEST_CONSTEXPR_CXX20 void test(S s1, const S& s2) {
  22   s1 = s2;
  23   LIBCPP_ASSERT(s1.__invariants());
  24   assert(s1 == s2);
  25   assert(s1.capacity() >= s1.size());
  26 }
  27
  28 template <class S>
  29 TEST_CONSTEXPR_CXX20 void test_string() {
  30   test(S(), S());
  31   test(S("1"), S());
  32   test(S(), S("1"));
  33   test(S("1"), S("2"));
  34   test(S("1"), S("2"));
  35
  36   test(S(), S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  37   test(S("123456789"), S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  38   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
  39        S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  40   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
  41          "1234567890123456789012345678901234567890123456789012345678901234567890"),
  42        S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  43 }
  44
  45 TEST_CONSTEXPR_CXX20 bool test() {
  46   test_string<std::string>();
  47 #if TEST_STD_VER >= 11
  48   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  49 #endif
  50
  51 #if TEST_STD_VER >= 11
  52   { // LWG 2946
  53     std::string s;
  54     s = {"abc", 1};
  55     assert(s.size() == 1);
  56     assert(s == "a");
  57   }
  58 #endif
  59
  60   return true;
  61 }
  62
  63 int main(int, char**) {
  64   test();
  65 #if TEST_STD_VER > 17
  66   static_assert(test());
  67 #endif
  68
  69   return 0;
  70 }