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 // reverse_iterator 13 14 // template <BidirectionalIterator Iter1, BidirectionalIterator Iter2> 15 // requires HasEqualTo<Iter1, Iter2> 16 // constexpr bool 17 // operator!=(const reverse_iterator<Iter1>& x, const reverse_iterator<Iter2>& y); 18 // 19 // constexpr in c++17 20 21 #include <iterator> 22 #include <cassert> 23 24 #include "test_macros.h" 25 #include "test_iterators.h" 26 27 template <class It> 28 void 29 test(It l, It r, bool x) 30 { 31 const std::reverse_iterator<It> r1(l); 32 const std::reverse_iterator<It> r2(r); 33 assert((r1 != r2) == x); 34 } 35 36 int main() 37 { 38 const char* s = "1234567890"; 39 test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s), false); 40 test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+1), true); 41 test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), false); 42 test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+1), true); 43 test(s, s, false); 44 test(s, s+1, true); 45 46 #if TEST_STD_VER > 14 47 { 48 constexpr const char *p = "123456789"; 49 typedef std::reverse_iterator<const char *> RI; 50 constexpr RI it1 = std::make_reverse_iterator(p); 51 constexpr RI it2 = std::make_reverse_iterator(p); 52 constexpr RI it3 = std::make_reverse_iterator(p+1); 53 static_assert(!(it1 != it2), ""); 54 static_assert( (it1 != it3), ""); 55 } 56 #endif 57 } 58
