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 InIter, OutputIterator<auto, InIter::reference> OutIter, 12 // Predicate<auto, InIter::value_type> Pred> 13 // requires CopyConstructible<Pred> 14 // constexpr OutIter // constexpr after C++17 15 // copy_if(InIter first, InIter last, OutIter result, Pred pred); 16 17 #include <algorithm> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "test_iterators.h" 22 23 struct Pred 24 { 25 TEST_CONSTEXPR_CXX14 bool operator()(int i) {return i % 3 == 0;} 26 }; 27 28 template <class InIter, class OutIter> 29 TEST_CONSTEXPR_CXX20 void 30 test_copy_if() 31 { 32 const unsigned N = 1000; 33 int ia[N] = {}; 34 for (unsigned i = 0; i < N; ++i) 35 ia[i] = i; 36 int ib[N] = {0}; 37 38 OutIter r = std::copy_if(InIter(ia), InIter(ia+N), OutIter(ib), Pred()); 39 assert(base(r) == ib+N/3+1); 40 for (unsigned i = 0; i < N/3+1; ++i) 41 assert(ib[i] % 3 == 0); 42 } 43 44 TEST_CONSTEXPR_CXX20 bool 45 test() 46 { 47 test_copy_if<input_iterator<const int*>, output_iterator<int*> >(); 48 test_copy_if<input_iterator<const int*>, input_iterator<int*> >(); 49 test_copy_if<input_iterator<const int*>, forward_iterator<int*> >(); 50 test_copy_if<input_iterator<const int*>, bidirectional_iterator<int*> >(); 51 test_copy_if<input_iterator<const int*>, random_access_iterator<int*> >(); 52 test_copy_if<input_iterator<const int*>, int*>(); 53 54 test_copy_if<forward_iterator<const int*>, output_iterator<int*> >(); 55 test_copy_if<forward_iterator<const int*>, input_iterator<int*> >(); 56 test_copy_if<forward_iterator<const int*>, forward_iterator<int*> >(); 57 test_copy_if<forward_iterator<const int*>, bidirectional_iterator<int*> >(); 58 test_copy_if<forward_iterator<const int*>, random_access_iterator<int*> >(); 59 test_copy_if<forward_iterator<const int*>, int*>(); 60 61 test_copy_if<bidirectional_iterator<const int*>, output_iterator<int*> >(); 62 test_copy_if<bidirectional_iterator<const int*>, input_iterator<int*> >(); 63 test_copy_if<bidirectional_iterator<const int*>, forward_iterator<int*> >(); 64 test_copy_if<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >(); 65 test_copy_if<bidirectional_iterator<const int*>, random_access_iterator<int*> >(); 66 test_copy_if<bidirectional_iterator<const int*>, int*>(); 67 68 test_copy_if<random_access_iterator<const int*>, output_iterator<int*> >(); 69 test_copy_if<random_access_iterator<const int*>, input_iterator<int*> >(); 70 test_copy_if<random_access_iterator<const int*>, forward_iterator<int*> >(); 71 test_copy_if<random_access_iterator<const int*>, bidirectional_iterator<int*> >(); 72 test_copy_if<random_access_iterator<const int*>, random_access_iterator<int*> >(); 73 test_copy_if<random_access_iterator<const int*>, int*>(); 74 75 test_copy_if<const int*, output_iterator<int*> >(); 76 test_copy_if<const int*, input_iterator<int*> >(); 77 test_copy_if<const int*, forward_iterator<int*> >(); 78 test_copy_if<const int*, bidirectional_iterator<int*> >(); 79 test_copy_if<const int*, random_access_iterator<int*> >(); 80 test_copy_if<const int*, int*>(); 81 82 return true; 83 } 84 85 int main(int, char**) 86 { 87 test(); 88 89 #if TEST_STD_VER > 17 90 static_assert(test()); 91 #endif 92 93 return 0; 94 } 95