| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <iterator> |
| |
| // All of these became constexpr in C++17 |
| // |
| // template <InputIterator Iter> |
| // constexpr void advance(Iter& i, Iter::difference_type n); |
| // |
| // template <BidirectionalIterator Iter> |
| // constexpr void advance(Iter& i, Iter::difference_type n); |
| // |
| // template <RandomAccessIterator Iter> |
| // constexpr void advance(Iter& i, Iter::difference_type n); |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It> |
| void |
| test(It i, typename std::iterator_traits<It>::difference_type n, It x) |
| { |
| std::advance(i, n); |
| assert(i == x); |
| } |
| |
| #if TEST_STD_VER > 14 |
| template <class It> |
| constexpr bool |
| constepxr_test(It i, typename std::iterator_traits<It>::difference_type n, It x) |
| { |
| std::advance(i, n); |
| return i == x; |
| } |
| #endif |
| |
| int main(int, char**) |
| { |
| { |
| const char* s = "1234567890"; |
| test(input_iterator<const char*>(s), 10, input_iterator<const char*>(s+10)); |
| test(forward_iterator<const char*>(s), 10, forward_iterator<const char*>(s+10)); |
| test(bidirectional_iterator<const char*>(s+5), 5, bidirectional_iterator<const char*>(s+10)); |
| test(bidirectional_iterator<const char*>(s+5), -5, bidirectional_iterator<const char*>(s)); |
| test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10)); |
| test(random_access_iterator<const char*>(s+5), -5, random_access_iterator<const char*>(s)); |
| test(s+5, 5, s+10); |
| test(s+5, -5, s); |
| } |
| #if TEST_STD_VER > 14 |
| { |
| constexpr const char* s = "1234567890"; |
| static_assert( constepxr_test(input_iterator<const char*>(s), 10, input_iterator<const char*>(s+10)), "" ); |
| static_assert( constepxr_test(forward_iterator<const char*>(s), 10, forward_iterator<const char*>(s+10)), "" ); |
| static_assert( constepxr_test(bidirectional_iterator<const char*>(s+5), 5, bidirectional_iterator<const char*>(s+10)), "" ); |
| static_assert( constepxr_test(bidirectional_iterator<const char*>(s+5), -5, bidirectional_iterator<const char*>(s)), "" ); |
| static_assert( constepxr_test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10)), "" ); |
| static_assert( constepxr_test(random_access_iterator<const char*>(s+5), -5, random_access_iterator<const char*>(s)), "" ); |
| static_assert( constepxr_test(s+5, 5, s+10), "" ); |
| static_assert( constepxr_test(s+5, -5, s), "" ); |
| } |
| #endif |
| |
| return 0; |
| } |