1 //-----------------------------------------------------------------------------
2 // boost-libs variant/test/variant_comparison_test.cpp source file
3 // See http://www.boost.org for updates, documentation, and revision history.
4 //-----------------------------------------------------------------------------
5 //
6 // Copyright (c) 2003 Eric Friedman, Itay Maman
7 // Copyright (c) 2014-2020 Antony Polukhin
8 //
9 // Distributed under the Boost Software License, Version 1.0. (See
10 // accompanying file LICENSE_1_0.txt or copy at
11 // http://www.boost.org/LICENSE_1_0.txt)
12
13 #include "boost/variant/variant.hpp"
14 #include "boost/core/lightweight_test.hpp"
15
16 #include <iostream>
17 #include <sstream>
18 #include <string>
19
20 #include <algorithm>
21 #include <vector>
22
23 #include "boost/detail/workaround.hpp"
24 #if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x0551))
25 # pragma warn -lvc // temporary used for parameter warning
26 #endif
27
28 template <typename T>
assert_equality_comparable(const T & x,const T & y,const T & z)29 void assert_equality_comparable(
30 const T& x, const T& y, const T& z
31 )
32 {
33 // identity check
34 BOOST_TEST( !(&x == &y) || (x == y) );
35 BOOST_TEST( !(&x == &z) || (x == z) );
36 BOOST_TEST( !(&y == &z) || (y == z) );
37 BOOST_TEST( !(&x == &y) || !(x != y) );
38 BOOST_TEST( !(&x == &z) || !(x != z) );
39 BOOST_TEST( !(&y == &z) || !(y != z) );
40
41 // reflexivity check
42 BOOST_TEST( (x == x) );
43 BOOST_TEST( (y == y) );
44 BOOST_TEST( (z == z) );
45
46 // symmetry check
47 BOOST_TEST( !(x == y) || (y == x) );
48 BOOST_TEST( !(y == x) || (x == y) );
49 BOOST_TEST( (x != y) || (y == x) );
50 BOOST_TEST( (y != x) || (x == y) );
51
52 BOOST_TEST( !(x == z) || (z == x) );
53 BOOST_TEST( !(z == x) || (x == z) );
54 BOOST_TEST( (x != z) || (z == x) );
55 BOOST_TEST( (z != x) || (x == z) );
56
57 BOOST_TEST( !(y == z) || (z == y) );
58 BOOST_TEST( !(z == y) || (y == z) );
59 BOOST_TEST( (y != z) || (z == y) );
60 BOOST_TEST( (z != y) || (y == z) );
61
62 // transitivity check
63 BOOST_TEST( !(x == y && y == z) || (x == z) );
64 BOOST_TEST( !(x == z && z == y) || (x == y) );
65 BOOST_TEST( !(y == z && z == x) || (y == x) );
66 }
67
68 template <typename T>
assert_less_than_comparable(const T & x,const T & y,const T & z)69 void assert_less_than_comparable(
70 const T& x, const T& y, const T& z
71 )
72 {
73 // irreflexivity check
74 BOOST_TEST( !(x < x) );
75 BOOST_TEST( !(y < y) );
76 BOOST_TEST( !(z < z) );
77 BOOST_TEST( !(x > x) );
78 BOOST_TEST( !(y > y) );
79 BOOST_TEST( !(z > z) );
80
81 BOOST_TEST( (x <= x) );
82 BOOST_TEST( (y <= y) );
83 BOOST_TEST( (z <= z) );
84 BOOST_TEST( (x >= x) );
85 BOOST_TEST( (y >= y) );
86 BOOST_TEST( (z >= z) );
87
88 // transitivity check
89 BOOST_TEST( (x < y) );
90 BOOST_TEST( (y < z) );
91 BOOST_TEST( (x < z) );
92
93 BOOST_TEST( (x <= y) );
94 BOOST_TEST( (y <= z) );
95 BOOST_TEST( (x <= z) );
96
97 BOOST_TEST( (z > y) );
98 BOOST_TEST( (y > x) );
99 BOOST_TEST( (z > x) );
100
101 BOOST_TEST( (z >= y) );
102 BOOST_TEST( (y >= x) );
103 BOOST_TEST( (z >= x) );
104
105 // antisymmetry check
106 BOOST_TEST( !(y < x) );
107 BOOST_TEST( !(z < y) );
108 BOOST_TEST( !(z < x) );
109 }
110
111 template <typename It>
print_range(It first,It last)112 std::string print_range(It first, It last)
113 {
114 std::ostringstream result;
115
116 while (first != last)
117 {
118 result << *first << ' ';
119 ++first;
120 }
121
122 return result.str();
123 }
124
main()125 int main()
126 {
127 typedef boost::variant<int, std::string> var_t;
128
129 var_t var1(3);
130 var_t var2(5);
131 var_t var3("goodbye");
132 var_t var4("hello");
133
134 assert_equality_comparable(var1, var1, var1);
135 assert_equality_comparable(var_t(var1), var_t(var1), var_t(var1));
136 assert_equality_comparable(var1, var2, var3);
137
138 assert_less_than_comparable(var1, var2, var3);
139 assert_less_than_comparable(var2, var3, var4);
140
141 std::vector<var_t> vec;
142 vec.push_back( var3 );
143 vec.push_back( var2 );
144 vec.push_back( var4 );
145 vec.push_back( var1 );
146 std::sort(vec.begin(), vec.end());
147
148 std::string sort_result( print_range(vec.begin(), vec.end()) );
149 BOOST_TEST( sort_result == "3 5 goodbye hello " );
150
151 // https://svn.boost.org/trac/boost/ticket/11751
152 int a = 0, b = 0;
153
154 boost::variant< int& > v (a), u (b);
155 BOOST_TEST(v == u);
156
157 return boost::report_errors();
158 }
159