libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace.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<ForwardIterator Iter, class T>
  12 //   requires OutputIterator<Iter, Iter::reference>
  13 //         && OutputIterator<Iter, const T&>
  14 //         && HasEqualTo<Iter::value_type, T>
  15 //   constexpr void      // constexpr after C++17
  16 //   replace(Iter first, Iter last, const T& old_value, const T& new_value);
  17
  18 #include <algorithm>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "test_iterators.h"
  23
  24
  25 #if TEST_STD_VER > 17
  26 TEST_CONSTEXPR bool test_constexpr() {
  27           int ia[]       = {0, 1, 2, 3, 4};
  28     const int expected[] = {0, 1, 5, 3, 4};
  29
  30     std::replace(std::begin(ia), std::end(ia), 2, 5);
  31     return std::equal(std::begin(ia), std::end(ia), std::begin(expected), std::end(expected))
  32         ;
  33     }
  34 #endif
  35
  36 template <class Iter>
  37 void
  38 test()
  39 {
  40     int ia[] = {0, 1, 2, 3, 4};
  41     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  42     std::replace(Iter(ia), Iter(ia+sa), 2, 5);
  43     assert(ia[0] == 0);
  44     assert(ia[1] == 1);
  45     assert(ia[2] == 5);
  46     assert(ia[3] == 3);
  47     assert(ia[4] == 4);
  48 }
  49
  50 int main(int, char**)
  51 {
  52     test<forward_iterator<int*> >();
  53     test<bidirectional_iterator<int*> >();
  54     test<random_access_iterator<int*> >();
  55     test<int*>();
  56
  57 #if TEST_STD_VER > 17
  58     static_assert(test_constexpr());
  59 #endif
  60
  61   return 0;
  62 }