libcxx/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of_pred.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<InputIterator Iter1, ForwardIterator Iter2,
  12 //          Predicate<auto, Iter1::value_type, Iter2::value_type> Pred>
  13 //   requires CopyConstructible<Pred>
  14 //   constexpr Iter1  // constexpr after C++17
  15 //   find_first_of(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2, Pred pred);
  16
  17 #include <algorithm>
  18 #include <functional>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "test_iterators.h"
  23
  24 #if TEST_STD_VER > 17
  25 constexpr bool test_constexpr() {
  26     int ia[] = {1, 2, 3};
  27     int ib[] = {7, 8, 9};
  28     int ic[] = {0, 1, 2, 3, 4, 5, 0, 1, 2, 3};
  29     typedef forward_iterator<int*>       FI;
  30     typedef bidirectional_iterator<int*> BI;
  31     typedef random_access_iterator<int*> RI;
  32     std::equal_to<int> eq{};
  33     return    (std::find_first_of(FI(std::begin(ic)), FI(std::end(ic)), FI(std::begin(ia)), FI(std::end(ia)), eq) == FI(ic+1))
  34            && (std::find_first_of(FI(std::begin(ic)), FI(std::end(ic)), FI(std::begin(ib)), FI(std::end(ib)), eq) == FI(std::end(ic)))
  35            && (std::find_first_of(BI(std::begin(ic)), BI(std::end(ic)), BI(std::begin(ia)), BI(std::end(ia)), eq) == BI(ic+1))
  36            && (std::find_first_of(BI(std::begin(ic)), BI(std::end(ic)), BI(std::begin(ib)), BI(std::end(ib)), eq) == BI(std::end(ic)))
  37            && (std::find_first_of(RI(std::begin(ic)), RI(std::end(ic)), RI(std::begin(ia)), RI(std::end(ia)), eq) == RI(ic+1))
  38            && (std::find_first_of(RI(std::begin(ic)), RI(std::end(ic)), RI(std::begin(ib)), RI(std::end(ib)), eq) == RI(std::end(ic)))
  39            ;
  40     }
  41 #endif
  42
  43 int main(int, char**)
  44 {
  45     int ia[] = {0, 1, 2, 3, 0, 1, 2, 3};
  46     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  47     int ib[] = {1, 3, 5, 7};
  48     const unsigned sb = sizeof(ib)/sizeof(ib[0]);
  49     assert(std::find_first_of(cpp17_input_iterator<const int*>(ia),
  50                               cpp17_input_iterator<const int*>(ia + sa),
  51                               forward_iterator<const int*>(ib),
  52                               forward_iterator<const int*>(ib + sb),
  53                               std::equal_to<int>()) ==
  54                               cpp17_input_iterator<const int*>(ia+1));
  55     int ic[] = {7};
  56     assert(std::find_first_of(cpp17_input_iterator<const int*>(ia),
  57                               cpp17_input_iterator<const int*>(ia + sa),
  58                               forward_iterator<const int*>(ic),
  59                               forward_iterator<const int*>(ic + 1),
  60                               std::equal_to<int>()) ==
  61                               cpp17_input_iterator<const int*>(ia+sa));
  62     assert(std::find_first_of(cpp17_input_iterator<const int*>(ia),
  63                               cpp17_input_iterator<const int*>(ia + sa),
  64                               forward_iterator<const int*>(ic),
  65                               forward_iterator<const int*>(ic),
  66                               std::equal_to<int>()) ==
  67                               cpp17_input_iterator<const int*>(ia+sa));
  68     assert(std::find_first_of(cpp17_input_iterator<const int*>(ia),
  69                               cpp17_input_iterator<const int*>(ia),
  70                               forward_iterator<const int*>(ic),
  71                               forward_iterator<const int*>(ic+1),
  72                               std::equal_to<int>()) ==
  73                               cpp17_input_iterator<const int*>(ia));
  74
  75 #if TEST_STD_VER > 17
  76     static_assert(test_constexpr());
  77 #endif
  78
  79   return 0;
  80 }