lexicographical_compare.pass.cpp (3699B)
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 // <algorithm> 11 12 // template<InputIterator Iter1, InputIterator Iter2> 13 // requires HasLess<Iter1::value_type, Iter2::value_type> 14 // && HasLess<Iter2::value_type, Iter1::value_type> 15 // constexpr bool // constexpr after C++17 16 // lexicographical_compare(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2); 17 18 #include <algorithm> 19 #include <cassert> 20 21 #include "test_macros.h" 22 #include "test_iterators.h" 23 24 #if TEST_STD_VER > 17 25 TEST_CONSTEXPR bool test_constexpr() { 26 int ia[] = {1, 2, 3}; 27 int ib[] = {1, 3, 5, 2, 4, 6}; 28 29 return std::lexicographical_compare(std::begin(ia), std::end(ia), std::begin(ib), std::end(ib)) 30 && !std::lexicographical_compare(std::begin(ib), std::end(ib), std::begin(ia), std::end(ia)) 31 ; 32 } 33 #endif 34 35 template <class Iter1, class Iter2> 36 void 37 test() 38 { 39 int ia[] = {1, 2, 3, 4}; 40 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 41 int ib[] = {1, 2, 3}; 42 assert(!std::lexicographical_compare(Iter1(ia), Iter1(ia+sa), Iter2(ib), Iter2(ib+2))); 43 assert( std::lexicographical_compare(Iter1(ib), Iter1(ib+2), Iter2(ia), Iter2(ia+sa))); 44 assert(!std::lexicographical_compare(Iter1(ia), Iter1(ia+sa), Iter2(ib), Iter2(ib+3))); 45 assert( std::lexicographical_compare(Iter1(ib), Iter1(ib+3), Iter2(ia), Iter2(ia+sa))); 46 assert( std::lexicographical_compare(Iter1(ia), Iter1(ia+sa), Iter2(ib+1), Iter2(ib+3))); 47 assert(!std::lexicographical_compare(Iter1(ib+1), Iter1(ib+3), Iter2(ia), Iter2(ia+sa))); 48 } 49 50 int main() 51 { 52 test<input_iterator<const int*>, input_iterator<const int*> >(); 53 test<input_iterator<const int*>, forward_iterator<const int*> >(); 54 test<input_iterator<const int*>, bidirectional_iterator<const int*> >(); 55 test<input_iterator<const int*>, random_access_iterator<const int*> >(); 56 test<input_iterator<const int*>, const int*>(); 57 58 test<forward_iterator<const int*>, input_iterator<const int*> >(); 59 test<forward_iterator<const int*>, forward_iterator<const int*> >(); 60 test<forward_iterator<const int*>, bidirectional_iterator<const int*> >(); 61 test<forward_iterator<const int*>, random_access_iterator<const int*> >(); 62 test<forward_iterator<const int*>, const int*>(); 63 64 test<bidirectional_iterator<const int*>, input_iterator<const int*> >(); 65 test<bidirectional_iterator<const int*>, forward_iterator<const int*> >(); 66 test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >(); 67 test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >(); 68 test<bidirectional_iterator<const int*>, const int*>(); 69 70 test<random_access_iterator<const int*>, input_iterator<const int*> >(); 71 test<random_access_iterator<const int*>, forward_iterator<const int*> >(); 72 test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >(); 73 test<random_access_iterator<const int*>, random_access_iterator<const int*> >(); 74 test<random_access_iterator<const int*>, const int*>(); 75 76 test<const int*, input_iterator<const int*> >(); 77 test<const int*, forward_iterator<const int*> >(); 78 test<const int*, bidirectional_iterator<const int*> >(); 79 test<const int*, random_access_iterator<const int*> >(); 80 test<const int*, const int*>(); 81 82 #if TEST_STD_VER > 17 83 static_assert(test_constexpr()); 84 #endif 85 }