copy_backward.pass.cpp (2185B)
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, BidirectionalIterator OutIter> 13 // requires OutputIterator<OutIter, InIter::reference> 14 // constexpr OutIter // constexpr after C++17 15 // copy_backward(InIter first, InIter last, OutIter result); 16 17 #include <algorithm> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "test_iterators.h" 22 #include "user_defined_integral.hpp" 23 24 // #if TEST_STD_VER > 17 25 // TEST_CONSTEXPR bool test_constexpr() { 26 // int ia[] = {1, 2, 3, 4, 5}; 27 // int ic[] = {6, 6, 6, 6, 6, 6, 6}; 28 // 29 // size_t N = std::size(ia); 30 // auto p = std::copy_backward(std::begin(ia), std::end(ia), std::begin(ic) + N); 31 // return std::equal(std::begin(ic), p, std::begin(ia)) 32 // && std::all_of(p, std::end(ic), [](int a){return a == 6;}) 33 // ; 34 // } 35 // #endif 36 37 template <class InIter, class OutIter> 38 void 39 test() 40 { 41 const unsigned N = 1000; 42 int ia[N]; 43 for (unsigned i = 0; i < N; ++i) 44 ia[i] = i; 45 int ib[N] = {0}; 46 47 OutIter r = std::copy_backward(InIter(ia), InIter(ia+N), OutIter(ib+N)); 48 assert(base(r) == ib); 49 for (unsigned i = 0; i < N; ++i) 50 assert(ia[i] == ib[i]); 51 } 52 53 int main() 54 { 55 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >(); 56 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >(); 57 test<bidirectional_iterator<const int*>, int*>(); 58 59 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >(); 60 test<random_access_iterator<const int*>, random_access_iterator<int*> >(); 61 test<random_access_iterator<const int*>, int*>(); 62 63 test<const int*, bidirectional_iterator<int*> >(); 64 test<const int*, random_access_iterator<int*> >(); 65 test<const int*, int*>(); 66 67 // #if TEST_STD_VER > 17 68 // static_assert(test_constexpr()); 69 // #endif 70 }