1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
// Copyright 2017, 2024 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/variant2/variant.hpp>
#include <boost/config/pragma_message.hpp>
#if !( defined(__cpp_constexpr) && __cpp_constexpr >= 201603L )
BOOST_PRAGMA_MESSAGE("Skipping constexpr visit test because __cpp_constexpr < 201603L")
int main() {}
#elif !defined(BOOST_MP11_HAS_CXX14_CONSTEXPR)
BOOST_PRAGMA_MESSAGE("Skipping constexpr visit test because BOOST_MP11_HAS_CXX14_CONSTEXPR is not defined")
int main() {}
#else
using namespace boost::variant2;
struct F
{
constexpr int operator()( int x1, int x2 ) const
{
return x1 + x2;
}
constexpr int operator()( int x1, int x2, int x3 ) const
{
return x1 + x2 + x3;
}
};
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
int main()
{
{
constexpr variant<char, int> v1( 1 );
constexpr variant<char, int> v2( '2' );
STATIC_ASSERT( visit( F(), v1, v2 ) == 1 + '2' );
}
{
constexpr variant<char, int> v1( 1 );
constexpr variant<char, int> v2( 2 );
constexpr variant<char, int> v3( '3' );
STATIC_ASSERT( visit( F(), v1, v2, v3 ) == 1 + 2 + '3' );
}
}
#endif
|
