| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <numeric> |
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| 10 | |
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| 11 | // Became constexpr in C++20 |
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| 12 | // template <class ForwardIterator, class T> |
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| 13 | // void iota(ForwardIterator first, ForwardIterator last, T value); |
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| 14 | |
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| 15 | #include <numeric> |
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| 16 | #include <cassert> |
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| 17 | |
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| 18 | #include "test_macros.h" |
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| 19 | #include "test_iterators.h" |
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| 20 | |
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| 21 | template <class InIter> |
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| 22 | TEST_CONSTEXPR_CXX20 void |
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| 23 | test() |
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| 24 | { |
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| 25 | int ia[] = {1, 2, 3, 4, 5}; |
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| 26 | int ir[] = {5, 6, 7, 8, 9}; |
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| 27 | const unsigned s = sizeof(ia) / sizeof(ia[0]); |
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| 28 | std::iota(InIter(ia), InIter(ia+s), 5); |
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| 29 | for (unsigned i = 0; i < s; ++i) |
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| 30 | assert(ia[i] == ir[i]); |
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| 31 | } |
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| 32 | |
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| 33 | TEST_CONSTEXPR_CXX20 bool |
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| 34 | test() |
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| 35 | { |
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| 36 | test<forward_iterator<int*> >(); |
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| 37 | test<bidirectional_iterator<int*> >(); |
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| 38 | test<random_access_iterator<int*> >(); |
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| 39 | test<int*>(); |
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| 40 | |
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| 41 | return true; |
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| 42 | } |
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| 43 | |
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| 44 | int main(int, char**) |
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| 45 | { |
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| 46 | test(); |
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| 47 | #if TEST_STD_VER > 17 |
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| 48 | static_assert(test()); |
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| 49 | #endif |
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| 50 | return 0; |
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| 51 | } |
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| 52 | |
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