libcxx/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.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 //   assign(basic_string<charT,traits>&& str); // constexpr since C++20
  13
  14 #include <string>
  15 #include <utility>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20
  21 template <class S>
  22 TEST_CONSTEXPR_CXX20 void test(S s, S str, S expected) {
  23   s.assign(std::move(str));
  24   LIBCPP_ASSERT(s.__invariants());
  25   assert(s == expected);
  26 }
  27
  28 template <class S>
  29 TEST_CONSTEXPR_CXX20 void test_string() {
  30   test(S(), S(), S());
  31   test(S(), S("12345"), S("12345"));
  32   test(S(), S("1234567890"), S("1234567890"));
  33   test(S(), S("12345678901234567890"), S("12345678901234567890"));
  34
  35   test(S("12345"), S(), S());
  36   test(S("12345"), S("12345"), S("12345"));
  37   test(S("12345"), S("1234567890"), S("1234567890"));
  38   test(S("12345"), S("12345678901234567890"), S("12345678901234567890"));
  39
  40   test(S("1234567890"), S(), S());
  41   test(S("1234567890"), S("12345"), S("12345"));
  42   test(S("1234567890"), S("1234567890"), S("1234567890"));
  43   test(S("1234567890"), S("12345678901234567890"), S("12345678901234567890"));
  44
  45   test(S("12345678901234567890"), S(), S());
  46   test(S("12345678901234567890"), S("12345"), S("12345"));
  47   test(S("12345678901234567890"), S("1234567890"), S("1234567890"));
  48   test(S("12345678901234567890"), S("12345678901234567890"), S("12345678901234567890"));
  49 }
  50
  51 TEST_CONSTEXPR_CXX20 bool test() {
  52   test_string<std::string>();
  53 #if TEST_STD_VER >= 11
  54   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  55 #endif
  56
  57   return true;
  58 }
  59
  60 int main(int, char**) {
  61   test();
  62 #if TEST_STD_VER > 17
  63   static_assert(test());
  64 #endif
  65
  66   return 0;
  67 }