| //===----------------------------------------------------------------------===// |
| // |
| // 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> |
| |
| // template <InputIterator Iter> |
| // Iter::difference_type |
| // distance(Iter first, Iter last); |
| // |
| // template <RandomAccessIterator Iter> |
| // Iter::difference_type |
| // distance(Iter first, Iter last); |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It> |
| void |
| test(It first, It last, typename std::iterator_traits<It>::difference_type x) |
| { |
| assert(std::distance(first, last) == x); |
| } |
| |
| #if TEST_STD_VER > 14 |
| template <class It> |
| constexpr bool |
| constexpr_test(It first, It last, typename std::iterator_traits<It>::difference_type x) |
| { |
| return std::distance(first, last) == x; |
| } |
| #endif |
| |
| int main(int, char**) |
| { |
| { |
| const char* s = "1234567890"; |
| test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), 10); |
| test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+10), 10); |
| test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+10), 10); |
| test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+10), 10); |
| test(s, s+10, 10); |
| } |
| #if TEST_STD_VER > 14 |
| { |
| constexpr const char* s = "1234567890"; |
| static_assert( constexpr_test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), 10), ""); |
| static_assert( constexpr_test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+10), 10), ""); |
| static_assert( constexpr_test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+10), 10), ""); |
| static_assert( constexpr_test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+10), 10), ""); |
| static_assert( constexpr_test(s, s+10, 10), ""); |
| } |
| #endif |
| |
| return 0; |
| } |