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<BidirectionalIterator InIter, OutputIterator<auto, InIter::reference> OutIter> 12 // constexpr OutIter // constexpr after C++17 13 // reverse_copy(InIter first, InIter last, OutIter result); 14 15 #include <algorithm> 16 #include <cassert> 17 18 #include "test_macros.h" 19 #include "test_iterators.h" 20 21 #if TEST_STD_VER > 17 22 TEST_CONSTEXPR bool test_constexpr() { 23 int ia[] = {1, 3, 5, 2, 5, 6}; 24 int ib[std::size(ia)] = {0}; 25 26 auto it = std::reverse_copy(std::begin(ia), std::end(ia), std::begin(ib)); 27 28 return std::distance(std::begin(ib), it) == static_cast<int>(std::size(ia)) 29 && std::equal (std::begin(ia), std::end(ia), std::rbegin(ib)) 30 ; 31 } 32 #endif 33 34 template <class InIter, class OutIter> 35 void 36 test() 37 { 38 const int ia[] = {0}; 39 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 40 int ja[sa] = {-1}; 41 OutIter r = std::reverse_copy(InIter(ia), InIter(ia), OutIter(ja)); 42 assert(base(r) == ja); 43 assert(ja[0] == -1); 44 r = std::reverse_copy(InIter(ia), InIter(ia+sa), OutIter(ja)); 45 assert(ja[0] == 0); 46 47 const int ib[] = {0, 1}; 48 const unsigned sb = sizeof(ib)/sizeof(ib[0]); 49 int jb[sb] = {-1}; 50 r = std::reverse_copy(InIter(ib), InIter(ib+sb), OutIter(jb)); 51 assert(base(r) == jb+sb); 52 assert(jb[0] == 1); 53 assert(jb[1] == 0); 54 55 const int ic[] = {0, 1, 2}; 56 const unsigned sc = sizeof(ic)/sizeof(ic[0]); 57 int jc[sc] = {-1}; 58 r = std::reverse_copy(InIter(ic), InIter(ic+sc), OutIter(jc)); 59 assert(base(r) == jc+sc); 60 assert(jc[0] == 2); 61 assert(jc[1] == 1); 62 assert(jc[2] == 0); 63 64 int id[] = {0, 1, 2, 3}; 65 const unsigned sd = sizeof(id)/sizeof(id[0]); 66 int jd[sd] = {-1}; 67 r = std::reverse_copy(InIter(id), InIter(id+sd), OutIter(jd)); 68 assert(base(r) == jd+sd); 69 assert(jd[0] == 3); 70 assert(jd[1] == 2); 71 assert(jd[2] == 1); 72 assert(jd[3] == 0); 73 } 74 75 int main(int, char**) 76 { 77 test<bidirectional_iterator<const int*>, output_iterator<int*> >(); 78 test<bidirectional_iterator<const int*>, forward_iterator<int*> >(); 79 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >(); 80 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >(); 81 test<bidirectional_iterator<const int*>, int*>(); 82 83 test<random_access_iterator<const int*>, output_iterator<int*> >(); 84 test<random_access_iterator<const int*>, forward_iterator<int*> >(); 85 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >(); 86 test<random_access_iterator<const int*>, random_access_iterator<int*> >(); 87 test<random_access_iterator<const int*>, int*>(); 88 89 test<const int*, output_iterator<int*> >(); 90 test<const int*, forward_iterator<int*> >(); 91 test<const int*, bidirectional_iterator<int*> >(); 92 test<const int*, random_access_iterator<int*> >(); 93 test<const int*, int*>(); 94 95 #if TEST_STD_VER > 17 96 static_assert(test_constexpr()); 97 #endif 98 99 return 0; 100 } 101