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 // UNSUPPORTED: clang-8 10 11 // <algorithm> 12 13 // template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter> 14 // constexpr OutIter // constexpr after C++17 15 // copy_n(InIter first, InIter::difference_type n, 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.h" 23 24 typedef UserDefinedIntegral<unsigned> UDI; 25 26 template <class InIter, class OutIter> 27 TEST_CONSTEXPR_CXX20 void 28 test_copy_n() 29 { 30 const unsigned N = 1000; 31 int ia[N] = {}; 32 for (unsigned i = 0; i < N; ++i) 33 ia[i] = i; 34 int ib[N] = {0}; 35 36 OutIter r = std::copy_n(InIter(ia), UDI(N/2), OutIter(ib)); 37 assert(base(r) == ib+N/2); 38 for (unsigned i = 0; i < N/2; ++i) 39 assert(ia[i] == ib[i]); 40 } 41 42 TEST_CONSTEXPR_CXX20 bool 43 test() 44 { 45 test_copy_n<input_iterator<const int*>, output_iterator<int*> >(); 46 test_copy_n<input_iterator<const int*>, input_iterator<int*> >(); 47 test_copy_n<input_iterator<const int*>, forward_iterator<int*> >(); 48 test_copy_n<input_iterator<const int*>, bidirectional_iterator<int*> >(); 49 test_copy_n<input_iterator<const int*>, random_access_iterator<int*> >(); 50 test_copy_n<input_iterator<const int*>, int*>(); 51 52 test_copy_n<forward_iterator<const int*>, output_iterator<int*> >(); 53 test_copy_n<forward_iterator<const int*>, input_iterator<int*> >(); 54 test_copy_n<forward_iterator<const int*>, forward_iterator<int*> >(); 55 test_copy_n<forward_iterator<const int*>, bidirectional_iterator<int*> >(); 56 test_copy_n<forward_iterator<const int*>, random_access_iterator<int*> >(); 57 test_copy_n<forward_iterator<const int*>, int*>(); 58 59 test_copy_n<bidirectional_iterator<const int*>, output_iterator<int*> >(); 60 test_copy_n<bidirectional_iterator<const int*>, input_iterator<int*> >(); 61 test_copy_n<bidirectional_iterator<const int*>, forward_iterator<int*> >(); 62 test_copy_n<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >(); 63 test_copy_n<bidirectional_iterator<const int*>, random_access_iterator<int*> >(); 64 test_copy_n<bidirectional_iterator<const int*>, int*>(); 65 66 test_copy_n<random_access_iterator<const int*>, output_iterator<int*> >(); 67 test_copy_n<random_access_iterator<const int*>, input_iterator<int*> >(); 68 test_copy_n<random_access_iterator<const int*>, forward_iterator<int*> >(); 69 test_copy_n<random_access_iterator<const int*>, bidirectional_iterator<int*> >(); 70 test_copy_n<random_access_iterator<const int*>, random_access_iterator<int*> >(); 71 test_copy_n<random_access_iterator<const int*>, int*>(); 72 73 test_copy_n<const int*, output_iterator<int*> >(); 74 test_copy_n<const int*, input_iterator<int*> >(); 75 test_copy_n<const int*, forward_iterator<int*> >(); 76 test_copy_n<const int*, bidirectional_iterator<int*> >(); 77 test_copy_n<const int*, random_access_iterator<int*> >(); 78 test_copy_n<const int*, int*>(); 79 80 return true; 81 } 82 83 int main(int, char**) 84 { 85 test(); 86 87 #if TEST_STD_VER > 17 88 static_assert(test()); 89 #endif 90 91 return 0; 92 } 93