| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <numeric> |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| |
| // template<class InputIterator> |
| // typename iterator_traits<InputIterator>::value_type |
| // reduce(InputIterator first, InputIterator last); |
| |
| #include <numeric> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class Iter, class T> |
| void |
| test(Iter first, Iter last, T x) |
| { |
| static_assert( std::is_same_v<typename std::iterator_traits<decltype(first)>::value_type, |
| decltype(std::reduce(first, last))> ); |
| assert(std::reduce(first, last) == x); |
| } |
| |
| template <class Iter> |
| void |
| test() |
| { |
| int ia[] = {1, 2, 3, 4, 5, 6}; |
| unsigned sa = sizeof(ia) / sizeof(ia[0]); |
| test(Iter(ia), Iter(ia), 0); |
| test(Iter(ia), Iter(ia+1), 1); |
| test(Iter(ia), Iter(ia+2), 3); |
| test(Iter(ia), Iter(ia+sa), 21); |
| } |
| |
| template <typename T> |
| void test_return_type() |
| { |
| T *p = nullptr; |
| static_assert( std::is_same_v<T, decltype(std::reduce(p, p))> ); |
| } |
| |
| int main(int, char**) |
| { |
| test_return_type<char>(); |
| test_return_type<int>(); |
| test_return_type<unsigned long>(); |
| test_return_type<float>(); |
| test_return_type<double>(); |
| |
| test<input_iterator<const int*> >(); |
| test<forward_iterator<const int*> >(); |
| test<bidirectional_iterator<const int*> >(); |
| test<random_access_iterator<const int*> >(); |
| test<const int*>(); |
| |
| return 0; |
| } |