libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap.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 // template<class charT, class traits, class Allocator>
  12 //   void swap(basic_string<charT,traits,Allocator>& lhs,
  13 //             basic_string<charT,traits,Allocator>& rhs); // constexpr since C++20
  14
  15 #include <string>
  16 #include <stdexcept>
  17 #include <algorithm>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21 #include "min_allocator.h"
  22
  23 template <class S>
  24 TEST_CONSTEXPR_CXX20 void test(S s1, S s2) {
  25   S s1_ = s1;
  26   S s2_ = s2;
  27   swap(s1, s2);
  28   LIBCPP_ASSERT(s1.__invariants());
  29   LIBCPP_ASSERT(s2.__invariants());
  30   assert(s1 == s2_);
  31   assert(s2 == s1_);
  32 }
  33
  34 template <class S>
  35 TEST_CONSTEXPR_CXX20 void test_string() {
  36   test(S(""), S(""));
  37   test(S(""), S("12345"));
  38   test(S(""), S("1234567890"));
  39   test(S(""), S("12345678901234567890"));
  40   test(S("abcde"), S(""));
  41   test(S("abcde"), S("12345"));
  42   test(S("abcde"), S("1234567890"));
  43   test(S("abcde"), S("12345678901234567890"));
  44   test(S("abcdefghij"), S(""));
  45   test(S("abcdefghij"), S("12345"));
  46   test(S("abcdefghij"), S("1234567890"));
  47   test(S("abcdefghij"), S("12345678901234567890"));
  48   test(S("abcdefghijklmnopqrst"), S(""));
  49   test(S("abcdefghijklmnopqrst"), S("12345"));
  50   test(S("abcdefghijklmnopqrst"), S("1234567890"));
  51   test(S("abcdefghijklmnopqrst"), S("12345678901234567890"));
  52 }
  53
  54 TEST_CONSTEXPR_CXX20 bool test() {
  55   test_string<std::string>();
  56 #if TEST_STD_VER >= 11
  57   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
  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 }