libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.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, Predicate<auto, Iter::value_type> Pred, class T>
  12 //   requires OutputIterator<Iter, Iter::reference>
  13 //         && OutputIterator<Iter, const T&>
  14 //         && CopyConstructible<Pred>
  15 //   constexpr void      // constexpr after C++17
  16 //   replace_if(Iter first, Iter last, Pred pred, const T& new_value);
  17
  18 #include <algorithm>
  19 #include <functional>
  20 #include <cassert>
  21
  22 #include "test_macros.h"
  23 #include "test_iterators.h"
  24
  25 TEST_CONSTEXPR bool equalToTwo(int v) { return v == 2; }
  26
  27 #if TEST_STD_VER > 17
  28 TEST_CONSTEXPR bool test_constexpr() {
  29           int ia[]       = {0, 1, 2, 3, 4};
  30     const int expected[] = {0, 1, 5, 3, 4};
  31
  32     std::replace_if(std::begin(ia), std::end(ia), equalToTwo, 5);
  33     return std::equal(std::begin(ia), std::end(ia), std::begin(expected), std::end(expected))
  34         ;
  35     }
  36 #endif
  37
  38
  39 template <class Iter>
  40 void
  41 test()
  42 {
  43     int ia[] = {0, 1, 2, 3, 4};
  44     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  45     std::replace_if(Iter(ia), Iter(ia+sa), equalToTwo, 5);
  46     assert(ia[0] == 0);
  47     assert(ia[1] == 1);
  48     assert(ia[2] == 5);
  49     assert(ia[3] == 3);
  50     assert(ia[4] == 4);
  51 }
  52
  53 int main(int, char**)
  54 {
  55     test<forward_iterator<int*> >();
  56     test<bidirectional_iterator<int*> >();
  57     test<random_access_iterator<int*> >();
  58     test<int*>();
  59
  60 #if TEST_STD_VER > 17
  61     static_assert(test_constexpr());
  62 #endif
  63
  64   return 0;
  65 }