libcxx/test/std/strings/basic.string/string.cons/move_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 "test_allocator.h"
  21 #include "min_allocator.h"
  22
  23 template <class S>
  24 TEST_CONSTEXPR_CXX20 void test(S s1, S s2) {
  25   S s0 = s2;
  26   s1   = std::move(s2);
  27   LIBCPP_ASSERT(s1.__invariants());
  28   LIBCPP_ASSERT(s2.__invariants());
  29   assert(s1 == s0);
  30   assert(s1.capacity() >= s1.size());
  31 }
  32
  33 template <class S>
  34 TEST_CONSTEXPR_CXX20 void test_string() {
  35   test(S(), S());
  36   test(S("1"), S());
  37   test(S(), S("1"));
  38   test(S("1"), S("2"));
  39   test(S("1"), S("2"));
  40
  41   test(S(), S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  42   test(S("123456789"), S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  43   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
  44        S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  45   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
  46          "1234567890123456789012345678901234567890123456789012345678901234567890"),
  47        S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  48 }
  49
  50 TEST_CONSTEXPR_CXX20 bool test() {
  51   test_string<std::string>();
  52 #if TEST_STD_VER >= 11
  53   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  54 #endif
  55
  56   return true;
  57 }
  58
  59 int main(int, char**) {
  60   test();
  61 #if TEST_STD_VER > 17
  62   static_assert(test());
  63 #endif
  64
  65   return 0;
  66 }