libcxx/test/std/algorithms/alg.modifying.operations/alg.swap/iter_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 // <algorithm>
  10
  11 // template<Iterator Iter1, Iterator Iter2>
  12 //   requires HasSwap<Iter1::reference, Iter2::reference>
  13 //   void
  14 //   iter_swap(Iter1 a, Iter2 b);
  15
  16 #include <algorithm>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 #if TEST_STD_VER > 17
  22 constexpr bool test_swap_constexpr()
  23 {
  24     int i = 1;
  25     int j = 2;
  26     std::iter_swap(&i, &j);
  27     return i == 2 && j == 1;
  28 }
  29 #endif // TEST_STD_VER > 17
  30
  31 int main(int, char**)
  32 {
  33     int i = 1;
  34     int j = 2;
  35     std::iter_swap(&i, &j);
  36     assert(i == 2);
  37     assert(j == 1);
  38
  39 #if TEST_STD_VER > 17
  40     static_assert(test_swap_constexpr());
  41 #endif // TEST_STD_VER > 17
  42
  43   return 0;
  44 }