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 // <numeric> 10 11 // Became constexpr in C++20 12 // template <InputIterator InIter, OutputIterator<auto, const InIter::value_type&> OutIter> 13 // requires HasPlus<InIter::value_type, InIter::reference> 14 // && HasAssign<InIter::value_type, 15 // HasPlus<InIter::value_type, InIter::reference>::result_type> 16 // && Constructible<InIter::value_type, InIter::reference> 17 // OutIter 18 // partial_sum(InIter first, InIter last, OutIter result); 19 20 #include <numeric> 21 #include <cassert> 22 23 #include "test_macros.h" 24 #include "test_iterators.h" 25 26 template <class InIter, class OutIter> 27 TEST_CONSTEXPR_CXX20 void 28 test() 29 { 30 int ia[] = {1, 2, 3, 4, 5}; 31 int ir[] = {1, 3, 6, 10, 15}; 32 const unsigned s = sizeof(ia) / sizeof(ia[0]); 33 int ib[s] = {0}; 34 OutIter r = std::partial_sum(InIter(ia), InIter(ia+s), OutIter(ib)); 35 assert(base(r) == ib + s); 36 for (unsigned i = 0; i < s; ++i) 37 assert(ib[i] == ir[i]); 38 } 39 40 TEST_CONSTEXPR_CXX20 bool 41 test() 42 { 43 test<cpp17_input_iterator<const int*>, cpp17_output_iterator<int*> >(); 44 test<cpp17_input_iterator<const int*>, forward_iterator<int*> >(); 45 test<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >(); 46 test<cpp17_input_iterator<const int*>, random_access_iterator<int*> >(); 47 test<cpp17_input_iterator<const int*>, int*>(); 48 49 test<forward_iterator<const int*>, cpp17_output_iterator<int*> >(); 50 test<forward_iterator<const int*>, forward_iterator<int*> >(); 51 test<forward_iterator<const int*>, bidirectional_iterator<int*> >(); 52 test<forward_iterator<const int*>, random_access_iterator<int*> >(); 53 test<forward_iterator<const int*>, int*>(); 54 55 test<bidirectional_iterator<const int*>, cpp17_output_iterator<int*> >(); 56 test<bidirectional_iterator<const int*>, forward_iterator<int*> >(); 57 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >(); 58 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >(); 59 test<bidirectional_iterator<const int*>, int*>(); 60 61 test<random_access_iterator<const int*>, cpp17_output_iterator<int*> >(); 62 test<random_access_iterator<const int*>, forward_iterator<int*> >(); 63 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >(); 64 test<random_access_iterator<const int*>, random_access_iterator<int*> >(); 65 test<random_access_iterator<const int*>, int*>(); 66 67 test<const int*, cpp17_output_iterator<int*> >(); 68 test<const int*, forward_iterator<int*> >(); 69 test<const int*, bidirectional_iterator<int*> >(); 70 test<const int*, random_access_iterator<int*> >(); 71 test<const int*, int*>(); 72 73 return true; 74 } 75 76 int main(int, char**) 77 { 78 test(); 79 #if TEST_STD_VER > 17 80 static_assert(test()); 81 #endif 82 return 0; 83 } 84