67 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <numeric>10 11// Became constexpr in C++2012// template <InputIterator Iter, MoveConstructible T>13// requires HasPlus<T, Iter::reference>14// && HasAssign<T, HasPlus<T, Iter::reference>::result_type>15// T16// accumulate(Iter first, Iter last, T init);17 18#include <numeric>19#include <cassert>20 21#include "test_macros.h"22#include "test_iterators.h"23 24template <class Iter, class T>25TEST_CONSTEXPR_CXX20 void26test(Iter first, Iter last, T init, T x)27{28 assert(std::accumulate(first, last, init) == x);29}30 31template <class Iter>32TEST_CONSTEXPR_CXX20 void33test()34{35 int ia[] = {1, 2, 3, 4, 5, 6};36 unsigned sa = sizeof(ia) / sizeof(ia[0]);37 test(Iter(ia), Iter(ia), 0, 0);38 test(Iter(ia), Iter(ia), 10, 10);39 test(Iter(ia), Iter(ia+1), 0, 1);40 test(Iter(ia), Iter(ia+1), 10, 11);41 test(Iter(ia), Iter(ia+2), 0, 3);42 test(Iter(ia), Iter(ia+2), 10, 13);43 test(Iter(ia), Iter(ia+sa), 0, 21);44 test(Iter(ia), Iter(ia+sa), 10, 31);45}46 47TEST_CONSTEXPR_CXX20 bool48test()49{50 test<cpp17_input_iterator<const int*> >();51 test<forward_iterator<const int*> >();52 test<bidirectional_iterator<const int*> >();53 test<random_access_iterator<const int*> >();54 test<const int*>();55 56 return true;57}58 59int main(int, char**)60{61 test();62#if TEST_STD_VER > 1763 static_assert(test());64#endif65 return 0;66}67