1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <algorithm> 11 12 // template<BidirectionalIterator InIter, OutputIterator<auto, InIter::reference> OutIter> 13 // constexpr OutIter // constexpr after C++17 14 // reverse_copy(InIter first, InIter last, OutIter result); 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, 3, 5, 2, 5, 6}; 25 int ib[std::size(ia)] = {0}; 26 27 auto it = std::reverse_copy(std::begin(ia), std::end(ia), std::begin(ib)); 28 29 return std::distance(std::begin(ib), it) == std::size(ia) 30 && std::equal (std::begin(ia), std::end(ia), std::rbegin(ib)) 31 ; 32 } 33 #endif 34 35 template <class InIter, class OutIter> 36 void 37 test() 38 { 39 const int ia[] = {0}; 40 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 41 int ja[sa] = {-1}; 42 OutIter r = std::reverse_copy(InIter(ia), InIter(ia), OutIter(ja)); 43 assert(base(r) == ja); 44 assert(ja[0] == -1); 45 r = std::reverse_copy(InIter(ia), InIter(ia+sa), OutIter(ja)); 46 assert(ja[0] == 0); 47 48 const int ib[] = {0, 1}; 49 const unsigned sb = sizeof(ib)/sizeof(ib[0]); 50 int jb[sb] = {-1}; 51 r = std::reverse_copy(InIter(ib), InIter(ib+sb), OutIter(jb)); 52 assert(base(r) == jb+sb); 53 assert(jb[0] == 1); 54 assert(jb[1] == 0); 55 56 const int ic[] = {0, 1, 2}; 57 const unsigned sc = sizeof(ic)/sizeof(ic[0]); 58 int jc[sc] = {-1}; 59 r = std::reverse_copy(InIter(ic), InIter(ic+sc), OutIter(jc)); 60 assert(base(r) == jc+sc); 61 assert(jc[0] == 2); 62 assert(jc[1] == 1); 63 assert(jc[2] == 0); 64 65 int id[] = {0, 1, 2, 3}; 66 const unsigned sd = sizeof(id)/sizeof(id[0]); 67 int jd[sd] = {-1}; 68 r = std::reverse_copy(InIter(id), InIter(id+sd), OutIter(jd)); 69 assert(base(r) == jd+sd); 70 assert(jd[0] == 3); 71 assert(jd[1] == 2); 72 assert(jd[2] == 1); 73 assert(jd[3] == 0); 74 } 75 76 int main() 77 { 78 test<bidirectional_iterator<const int*>, output_iterator<int*> >(); 79 test<bidirectional_iterator<const int*>, forward_iterator<int*> >(); 80 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >(); 81 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >(); 82 test<bidirectional_iterator<const int*>, int*>(); 83 84 test<random_access_iterator<const int*>, output_iterator<int*> >(); 85 test<random_access_iterator<const int*>, forward_iterator<int*> >(); 86 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >(); 87 test<random_access_iterator<const int*>, random_access_iterator<int*> >(); 88 test<random_access_iterator<const int*>, int*>(); 89 90 test<const int*, output_iterator<int*> >(); 91 test<const int*, forward_iterator<int*> >(); 92 test<const int*, bidirectional_iterator<int*> >(); 93 test<const int*, random_access_iterator<int*> >(); 94 test<const int*, int*>(); 95 96 #if TEST_STD_VER > 17 97 static_assert(test_constexpr()); 98 #endif 99 } 100
