copy_n.pass.cpp (3477B)
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<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter> 13 // constexpr OutIter // constexpr after C++17 14 // copy_n(InIter first, InIter::difference_type n, OutIter result); 15 16 #include <algorithm> 17 #include <cassert> 18 19 #include "test_macros.h" 20 #include "test_iterators.h" 21 #include "user_defined_integral.hpp" 22 23 // #if TEST_STD_VER > 17 24 // TEST_CONSTEXPR bool test_constexpr() { 25 // int ia[] = {1, 2, 3, 4, 5}; 26 // int ic[] = {6, 6, 6, 6, 6, 6, 6}; 27 // 28 // auto p = std::copy_n(std::begin(ia), 4, std::begin(ic)); 29 // return std::equal(std::begin(ic), p, std::begin(ia)) 30 // && std::all_of(p, std::end(ic), [](int a){return a == 6;}) 31 // ; 32 // } 33 // #endif 34 35 typedef UserDefinedIntegral<unsigned> UDI; 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_n(InIter(ia), UDI(N/2), OutIter(ib)); 48 assert(base(r) == ib+N/2); 49 for (unsigned i = 0; i < N/2; ++i) 50 assert(ia[i] == ib[i]); 51 } 52 53 int main() 54 { 55 test<input_iterator<const int*>, output_iterator<int*> >(); 56 test<input_iterator<const int*>, input_iterator<int*> >(); 57 test<input_iterator<const int*>, forward_iterator<int*> >(); 58 test<input_iterator<const int*>, bidirectional_iterator<int*> >(); 59 test<input_iterator<const int*>, random_access_iterator<int*> >(); 60 test<input_iterator<const int*>, int*>(); 61 62 test<forward_iterator<const int*>, output_iterator<int*> >(); 63 test<forward_iterator<const int*>, input_iterator<int*> >(); 64 test<forward_iterator<const int*>, forward_iterator<int*> >(); 65 test<forward_iterator<const int*>, bidirectional_iterator<int*> >(); 66 test<forward_iterator<const int*>, random_access_iterator<int*> >(); 67 test<forward_iterator<const int*>, int*>(); 68 69 test<bidirectional_iterator<const int*>, output_iterator<int*> >(); 70 test<bidirectional_iterator<const int*>, input_iterator<int*> >(); 71 test<bidirectional_iterator<const int*>, forward_iterator<int*> >(); 72 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >(); 73 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >(); 74 test<bidirectional_iterator<const int*>, int*>(); 75 76 test<random_access_iterator<const int*>, output_iterator<int*> >(); 77 test<random_access_iterator<const int*>, input_iterator<int*> >(); 78 test<random_access_iterator<const int*>, forward_iterator<int*> >(); 79 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >(); 80 test<random_access_iterator<const int*>, random_access_iterator<int*> >(); 81 test<random_access_iterator<const int*>, int*>(); 82 83 test<const int*, output_iterator<int*> >(); 84 test<const int*, input_iterator<int*> >(); 85 test<const int*, forward_iterator<int*> >(); 86 test<const int*, bidirectional_iterator<int*> >(); 87 test<const int*, random_access_iterator<int*> >(); 88 test<const int*, int*>(); 89 90 // #if TEST_STD_VER > 17 91 // static_assert(test_constexpr()); 92 // #endif 93 }