1
2 // Copyright 2017, 2019 Peter Dimov
3 //
4 // Distributed under the Boost Software License, Version 1.0.
5 //
6 // See accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt
8
9 #include <boost/variant2/variant.hpp>
10 using namespace boost::variant2;
11
12 #if !defined(BOOST_MP11_HAS_CXX14_CONSTEXPR)
13
14 #include <boost/config/pragma_message.hpp>
15
16 BOOST_PRAGMA_MESSAGE("Skipping constexpr op<, op<= test because BOOST_MP11_HAS_CXX14_CONSTEXPR is not defined")
17
main()18 int main() {}
19
20 #else
21
22 struct X
23 {
24 };
25
operator <(X const &,X const &)26 inline constexpr bool operator<( X const&, X const& ) { return false; }
operator >(X const &,X const &)27 inline constexpr bool operator>( X const&, X const& ) { return false; }
operator <=(X const &,X const &)28 inline constexpr bool operator<=( X const&, X const& ) { return false; }
operator >=(X const &,X const &)29 inline constexpr bool operator>=( X const&, X const& ) { return false; }
30
31 #define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
32
33 #define TEST_EQ( v1, v2 ) \
34 STATIC_ASSERT( !(v1 < v2) ); \
35 STATIC_ASSERT( !(v1 > v2) ); \
36 STATIC_ASSERT( v1 <= v2 ); \
37 STATIC_ASSERT( v1 >= v2 );
38
39 #define TEST_LE( v1, v3 ) \
40 STATIC_ASSERT( v1 < v3 ); \
41 STATIC_ASSERT( v3 > v1 ); \
42 STATIC_ASSERT( !(v1 > v3) ); \
43 STATIC_ASSERT( !(v3 < v1) ); \
44 STATIC_ASSERT( v1 <= v3 ); \
45 STATIC_ASSERT( v3 >= v1 ); \
46 STATIC_ASSERT( !(v1 >= v3) ); \
47 STATIC_ASSERT( !(v3 <= v1) );
48
main()49 int main()
50 {
51 {
52 constexpr variant<int> v1, v2, v3( 1 ), v4( 1 );
53
54 TEST_EQ( v1, v2 )
55 TEST_LE( v1, v3 )
56 TEST_EQ( v3, v4 )
57 }
58
59 {
60 constexpr variant<int, float> v1, v2, v3( 1 ), v4( 1 ), v5( 3.14f ), v6( 3.14f );
61
62 TEST_EQ( v1, v2 )
63 TEST_LE( v1, v3 )
64 TEST_EQ( v3, v4 )
65 TEST_LE( v1, v5 )
66 TEST_LE( v3, v5 )
67 TEST_EQ( v5, v6 )
68 }
69
70 {
71 constexpr variant<int, int, float> v1, v2, v3( in_place_index_t<1>{} ), v4( in_place_index_t<1>{} ), v5( 3.14f ), v6( 3.14f );
72
73 TEST_EQ( v1, v2 )
74 TEST_LE( v1, v3 )
75 TEST_EQ( v3, v4 )
76 TEST_LE( v1, v5 )
77 TEST_LE( v3, v5 )
78 TEST_EQ( v5, v6 )
79 }
80
81 {
82 constexpr variant<X> v1, v2;
83
84 STATIC_ASSERT( !(v1 < v2) );
85 STATIC_ASSERT( !(v1 > v2) );
86 STATIC_ASSERT( !(v1 <= v2) );
87 STATIC_ASSERT( !(v1 >= v2) );
88 }
89 }
90
91 #endif
92