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1 // Copyright (C) 2020 Free Software Foundation, Inc.
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2 //
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3 // This file is part of the GNU ISO C++ Library. This library is free
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4 // software; you can redistribute it and/or modify it under the
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5 // terms of the GNU General Public License as published by the
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6 // Free Software Foundation; either version 3, or (at your option)
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7 // any later version.
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8
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9 // This library is distributed in the hope that it will be useful,
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10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 // GNU General Public License for more details.
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13
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14 // You should have received a copy of the GNU General Public License along
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15 // with this library; see the file COPYING3. If not see
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16 // <http://www.gnu.org/licenses/>.
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17
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18 // { dg-options "-std=gnu++2a" }
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19 // { dg-do run { target c++2a } }
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20
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21 #include <vector>
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22 #include <testsuite_hooks.h>
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23
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24 void
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25 test01()
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26 {
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27 std::vector<int> c1{ 1, 2, 3 }, c2{ 1, 2, 3, 4 }, c3{ 1, 2, 4 };
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28 VERIFY( c1 == c1 );
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29 VERIFY( std::is_eq(c1 <=> c1) );
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30 VERIFY( c1 < c2 );
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31 VERIFY( std::is_lt(c1 <=> c2) );
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32 VERIFY( c1 < c3 );
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33 VERIFY( std::is_lt(c1 <=> c3) );
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34 VERIFY( c2 < c3 );
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35 VERIFY( std::is_lt(c2 <=> c3) );
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36
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37 static_assert( std::totally_ordered<std::vector<int>> );
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38
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39 static_assert( std::three_way_comparable<std::vector<int>,
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40 std::strong_ordering> );
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41 static_assert( ! std::three_way_comparable<std::vector<float>,
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42 std::strong_ordering> );
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43 static_assert( ! std::three_way_comparable<std::vector<float>,
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44 std::weak_ordering> );
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45 static_assert( std::three_way_comparable<std::vector<float>,
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46 std::partial_ordering> );
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47
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48 struct E
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49 {
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50 bool operator==(E) { return true; }
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51 };
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52 static_assert( ! std::totally_ordered<std::vector<E>> );
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53 static_assert( ! std::three_way_comparable<E> );
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54 static_assert( ! std::three_way_comparable<std::vector<E>> );
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55 }
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56
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57 void
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58 test02()
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59 {
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60 struct W
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61 {
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62 int value = 0;
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63
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64 bool operator==(W rhs) const noexcept
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65 { return (value | 1) == (rhs.value | 1); }
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66
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67 std::weak_ordering
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68 operator<=>(W rhs) const noexcept
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69 { return (value | 1) <=> (rhs.value | 1); }
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70 };
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71
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72 static_assert( std::totally_ordered<std::vector<W>> );
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73
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74 std::vector<W> c1{ {1}, {2}, {3} }, c2{ {0}, {3}, {3} };
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75 static_assert( std::same_as<decltype(c1 <=> c1), std::weak_ordering> );
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76 VERIFY( c1 == c2 );
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77 VERIFY( std::is_eq(c1 <=> c2) );
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78 }
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79
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80 void
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81 test03()
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82 {
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83 struct P
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84 {
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85 int value = 0;
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86
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87 bool operator==(P rhs) const noexcept
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88 {
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89 if (value < 0 || rhs.value < 0)
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90 return false;
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91 return value == rhs.value;
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92 }
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93
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94 std::partial_ordering
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95 operator<=>(P rhs) const noexcept
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96 {
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97 if (value < 0 || rhs.value < 0)
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98 return std::partial_ordering::unordered;
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99 return value <=> rhs.value;
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100 }
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101 };
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102
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103 static_assert( std::totally_ordered<std::vector<P>> );
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104
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105 std::vector<P> c{ {1}, {2}, {-3} };
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106 static_assert( std::three_way_comparable<P> );
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107 static_assert( std::same_as<decltype(c <=> c), std::partial_ordering> );
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108 VERIFY( (c <=> c) == std::partial_ordering::unordered );
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109 }
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110
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111 void
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112 test04()
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113 {
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114 struct L
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115 {
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116 int value = 0;
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117
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118 bool operator<(L rhs) const noexcept { return value < rhs.value; }
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119 };
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120
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121 static_assert( std::totally_ordered<std::vector<L>> );
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122
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123 std::vector<L> c{ {1}, {2}, {3} }, d{ {1}, {2}, {3}, {4} };
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124 static_assert( std::same_as<decltype(c <=> c), std::weak_ordering> );
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125 VERIFY( std::is_lt(c <=> d) );
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126 }
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127
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128 void
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129 test05()
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130 {
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131 // vector iterators are random access, so should support <=>
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132
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133 std::vector<int> c{ 1, 2, 3 };
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134 VERIFY( c.begin() == c.cbegin() );
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135 VERIFY( std::is_eq(c.begin() <=> c.cbegin()) );
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136
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137 VERIFY( c.begin() < c.end() );
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138 VERIFY( std::is_lt(c.begin() <=> c.end()) );
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139
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140 VERIFY( c.begin() < c.cend() );
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141 VERIFY( std::is_lt(c.begin() <=> c.cend()) );
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142
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143 VERIFY( c.crbegin() == c.rbegin() );
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144 VERIFY( std::is_eq(c.crbegin() <=> c.rbegin()) );
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145
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146 VERIFY( c.rend() > c.rbegin() );
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147 VERIFY( std::is_gt(c.rend() <=> c.rbegin()) );
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148
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149 static_assert( std::same_as<decltype(c.begin() <=> c.begin()),
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150 std::strong_ordering> );
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151 }
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152
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153 int
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154 main()
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155 {
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156 test01();
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157 test02();
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158 test03();
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159 test04();
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160 test05();
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161 }
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