libcxx/test/std/containers/iterator.rel_ops.compile.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // XFAIL: availability-filesystem-missing
  10
  11 // Make sure the various containers' iterators are not broken by the use of `std::rel_ops`.
  12
  13 #include <utility> // for std::rel_ops
  14
  15 #include <array>
  16 #include <deque>
  17 #include <filesystem>
  18 #include <forward_list>
  19 #include <list>
  20 #include <map>
  21 #include <set>
  22 #include <string>
  23 #include <unordered_map>
  24 #include <unordered_set>
  25 #include <vector>
  26
  27 #include "test_macros.h"
  28
  29 #if TEST_STD_VER >= 17
  30 #include <string_view>
  31 #endif
  32
  33 #if TEST_STD_VER >= 20
  34 #include <span>
  35 #endif
  36
  37 using namespace std::rel_ops;
  38
  39 template<class It, class ConstIt>
  40 void test_eq(It it, ConstIt cit) {
  41     (void)(it == it);
  42     (void)(it != it);
  43     (void)(it == cit);
  44     (void)(it != cit);
  45     (void)(cit == it);
  46     (void)(cit != it);
  47     (void)(cit == cit);
  48     (void)(cit != cit);
  49 }
  50
  51 template<class It, class ConstIt>
  52 void test_lt(It it, ConstIt cit) {
  53     (void)(it <  it);
  54     (void)(it <= it);
  55     (void)(it >  it);
  56     (void)(it >= it);
  57     (void)(it <  cit);
  58     (void)(it <= cit);
  59     (void)(it >  cit);
  60     (void)(it >= cit);
  61     (void)(cit <  it);
  62     (void)(cit <= it);
  63     (void)(cit >  it);
  64     (void)(cit >= it);
  65     (void)(cit <  cit);
  66     (void)(cit <= cit);
  67     (void)(cit >  cit);
  68     (void)(cit >= cit);
  69
  70     // Test subtraction too, even though std::rel_ops shouldn't affect it.
  71
  72     (void)(it - it);
  73     (void)(it - cit);
  74     (void)(cit - it);
  75     (void)(cit - cit);
  76 }
  77
  78 template<class Container>
  79 void test_forward() {
  80     // There is no need to distinguish "forward" from "bidirectional."
  81     // libc++ already can't handle `c.rbegin() >= c.rbegin()` in the
  82     // presence of std::rel_ops, and neither can Microsoft nor libstdc++.
  83
  84     Container c;
  85     typename Container::iterator it = c.begin();
  86     typename Container::const_iterator cit = c.begin();
  87     test_eq(it, cit);
  88 }
  89
  90 template<class Container>
  91 void test_random_access() {
  92     Container c;
  93     typename Container::iterator it = c.begin();
  94     typename Container::const_iterator cit = c.begin();
  95     test_eq(it, cit);
  96     test_lt(it, cit);
  97 }
  98
  99 template void test_random_access<std::array<int, 10> >();
 100 template void test_random_access<std::deque<int> >();
 101 template void test_forward<std::forward_list<int> >();
 102 template void test_forward<std::list<int> >();
 103 template void test_forward<std::map<int, int> >();
 104 template void test_forward<std::multimap<int, int> >();
 105 template void test_forward<std::multiset<int> >();
 106 template void test_forward<std::set<int> >();
 107 template void test_random_access<std::string>();
 108 template void test_forward<std::unordered_map<int, int> >();
 109 template void test_forward<std::unordered_multimap<int, int> >();
 110 template void test_forward<std::unordered_multiset<int> >();
 111 template void test_forward<std::unordered_set<int> >();
 112 template void test_random_access<std::vector<int> >();
 113
 114 #if TEST_STD_VER >= 17
 115 void test_directory_iterators() {
 116 #ifndef TEST_HAS_NO_FILESYSTEM
 117     std::filesystem::directory_iterator it;
 118     test_eq(it, it);
 119
 120     std::filesystem::recursive_directory_iterator rdit;
 121     test_eq(rdit, rdit);
 122 #endif
 123 }
 124
 125 template void test_forward<std::filesystem::path>();
 126 #endif
 127
 128 #if TEST_STD_VER >= 17
 129 template void test_random_access<std::string_view>();
 130 #endif
 131
 132 #if TEST_STD_VER >= 20
 133 void test_span() {
 134     std::span<int> c;
 135     std::span<int>::iterator it = c.begin();  // span has no const_iterator
 136     test_eq(it, it);
 137     test_lt(it, it);
 138 }
 139 #endif