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