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 #include "asan_testing.h"
  23
  24 template <class S>
  25 TEST_CONSTEXPR_CXX20 void test(S s1, S s2) {
  26   S s1_ = s1;
  27   S s2_ = s2;
  28   swap(s1, s2);
  29   LIBCPP_ASSERT(s1.__invariants());
  30   LIBCPP_ASSERT(s2.__invariants());
  31   assert(s1 == s2_);
  32   assert(s2 == s1_);
  33   LIBCPP_ASSERT(is_string_asan_correct(s1));
  34   LIBCPP_ASSERT(is_string_asan_correct(s2));
  35 }
  36
  37 template <class S>
  38 TEST_CONSTEXPR_CXX20 void test_string() {
  39   test(S(""), S(""));
  40   test(S(""), S("12345"));
  41   test(S(""), S("1234567890"));
  42   test(S(""), S("12345678901234567890"));
  43   test(S("abcde"), S(""));
  44   test(S("abcde"), S("12345"));
  45   test(S("abcde"), S("1234567890"));
  46   test(S("abcde"), S("12345678901234567890"));
  47   test(S("abcdefghij"), S(""));
  48   test(S("abcdefghij"), S("12345"));
  49   test(S("abcdefghij"), S("1234567890"));
  50   test(S("abcdefghij"), S("12345678901234567890"));
  51   test(S("abcdefghijklmnopqrst"), S(""));
  52   test(S("abcdefghijklmnopqrst"), S("12345"));
  53   test(S("abcdefghijklmnopqrst"), S("1234567890"));
  54   test(S("abcdefghijklmnopqrst"), S("12345678901234567890"));
  55   test(S("abcdefghijklmnopqrst123456LONG1234567890"), S(""));
  56   test(S("abcdefghijklmnopqrst123456LONG1234567890"), S("12345"));
  57   test(S("abcdefghijklmnopqrst123456LONG1234567890"), S("1234567890"));
  58   test(S("abcdefghijklmnopqrst123456LONG1234567890"), S("12345678901234567890"));
  59 }
  60
  61 TEST_CONSTEXPR_CXX20 bool test() {
  62   test_string<std::string>();
  63 #if TEST_STD_VER >= 11
  64   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
  65   test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char> > >();
  66 #endif
  67
  68   return true;
  69 }
  70
  71 int main(int, char**) {
  72   test();
  73 #if TEST_STD_VER > 17
  74   static_assert(test());
  75 #endif
  76
  77   return 0;
  78 }