forked from OSchip/llvm-project
64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <numeric>
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// template<class InputIterator>
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// typename iterator_traits<InputIterator>::value_type
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// reduce(InputIterator first, InputIterator last);
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#include <numeric>
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#include <cassert>
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#include "test_iterators.h"
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template <class Iter, class T>
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void
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test(Iter first, Iter last, T x)
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{
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static_assert( std::is_same_v<typename std::iterator_traits<decltype(first)>::value_type,
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decltype(std::reduce(first, last))> );
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assert(std::reduce(first, last) == x);
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}
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template <class Iter>
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void
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test()
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{
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int ia[] = {1, 2, 3, 4, 5, 6};
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unsigned sa = sizeof(ia) / sizeof(ia[0]);
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test(Iter(ia), Iter(ia), 0);
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test(Iter(ia), Iter(ia+1), 1);
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test(Iter(ia), Iter(ia+2), 3);
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test(Iter(ia), Iter(ia+sa), 21);
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}
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template <typename T>
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void test_return_type()
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{
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T *p = nullptr;
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static_assert( std::is_same_v<T, decltype(std::reduce(p, p))> );
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}
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int main()
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{
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test_return_type<char>();
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test_return_type<int>();
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test_return_type<unsigned long>();
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test_return_type<float>();
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test_return_type<double>();
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test<input_iterator<const int*> >();
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test<forward_iterator<const int*> >();
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test<bidirectional_iterator<const int*> >();
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test<random_access_iterator<const int*> >();
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test<const int*>();
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}
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