libcxx/test/std/algorithms/alg.nonmodifying/alg.all_of/all_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 <class InputIterator, class Predicate>
  12 //     constexpr bool       // constexpr after C++17
  13 //   all_of(InputIterator first, InputIterator last, Predicate pred);
  14
  15 #include <algorithm>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "test_iterators.h"
  20
  21 struct test1
  22 {
  23     TEST_CONSTEXPR bool operator()(const int& i) const
  24     {
  25         return i % 2 == 0;
  26     }
  27 };
  28
  29 #if TEST_STD_VER > 17
  30 TEST_CONSTEXPR bool test_constexpr() {
  31     int ia[] = {2, 4, 6, 8};
  32     int ib[] = {2, 4, 5, 8};
  33     return  std::all_of(std::begin(ia), std::end(ia), test1())
  34         && !std::all_of(std::begin(ib), std::end(ib), test1())
  35         ;
  36     }
  37 #endif
  38
  39 int main(int, char**)
  40 {
  41     {
  42         int ia[] = {2, 4, 6, 8};
  43         const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  44         assert(std::all_of(cpp17_input_iterator<const int*>(ia),
  45                            cpp17_input_iterator<const int*>(ia + sa), test1()) == true);
  46         assert(std::all_of(cpp17_input_iterator<const int*>(ia),
  47                            cpp17_input_iterator<const int*>(ia), test1()) == true);
  48     }
  49     {
  50         const int ia[] = {2, 4, 5, 8};
  51         const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  52         assert(std::all_of(cpp17_input_iterator<const int*>(ia),
  53                            cpp17_input_iterator<const int*>(ia + sa), test1()) == false);
  54         assert(std::all_of(cpp17_input_iterator<const int*>(ia),
  55                            cpp17_input_iterator<const int*>(ia), test1()) == true);
  56     }
  57
  58 #if TEST_STD_VER > 17
  59     static_assert(test_constexpr());
  60 #endif
  61
  62   return 0;
  63 }