libcxx/test/std/strings/basic.string/string.cons/move.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(basic_string<charT,traits,Allocator>&& str); // constexpr since C++20
  14
  15 #include <string>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "test_allocator.h"
  20 #include "min_allocator.h"
  21
  22 template <class S>
  23 TEST_CONSTEXPR_CXX20 void test(S s0) {
  24   S s1 = s0;
  25   S s2 = std::move(s0);
  26   LIBCPP_ASSERT(s2.__invariants());
  27   LIBCPP_ASSERT(s0.__invariants());
  28   assert(s2 == s1);
  29   assert(s2.capacity() >= s2.size());
  30   assert(s2.get_allocator() == s1.get_allocator());
  31 }
  32
  33 template <class Alloc>
  34 TEST_CONSTEXPR_CXX20 void test_string(Alloc const& a) {
  35   using S = std::basic_string<char, std::char_traits<char>, Alloc>;
  36   test(S(Alloc(a)));
  37   test(S("1", Alloc(a)));
  38   test(S("1234567890123456789012345678901234567890123456789012345678901234567890", Alloc(a)));
  39 }
  40
  41 TEST_CONSTEXPR_CXX20 bool test() {
  42   test_string(std::allocator<char>());
  43   test_string(test_allocator<char>());
  44   test_string(test_allocator<char>(3));
  45   test_string(min_allocator<char>());
  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 }