1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <iterator> 11 12 // template <InputIterator Iter> 13 // Iter::difference_type 14 // distance(Iter first, Iter last); 15 // 16 // template <RandomAccessIterator Iter> 17 // Iter::difference_type 18 // distance(Iter first, Iter last); 19 20 #include <iterator> 21 #include <cassert> 22 23 #include "test_iterators.h" 24 25 template <class It> 26 void 27 test(It first, It last, typename std::iterator_traits<It>::difference_type x) 28 { 29 assert(std::distance(first, last) == x); 30 } 31 32 #if TEST_STD_VER > 14 33 template <class It> 34 constexpr bool 35 constexpr_test(It first, It last, typename std::iterator_traits<It>::difference_type x) 36 { 37 return std::distance(first, last) == x; 38 } 39 #endif 40 41 int main() 42 { 43 { 44 const char* s = "1234567890"; 45 test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), 10); 46 test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+10), 10); 47 test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+10), 10); 48 test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+10), 10); 49 test(s, s+10, 10); 50 } 51 #if TEST_STD_VER > 14 52 { 53 constexpr const char* s = "1234567890"; 54 static_assert( constexpr_test(input_iterator<const char*>(s), input_iterator<const char*>(s+10), 10), ""); 55 static_assert( constexpr_test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+10), 10), ""); 56 static_assert( constexpr_test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+10), 10), ""); 57 static_assert( constexpr_test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+10), 10), ""); 58 static_assert( constexpr_test(s, s+10, 10), ""); 59 } 60 #endif 61 } 62
