1
2// Copyright 2017 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#include <boost/core/lightweight_test.hpp>
11#include <string>
12
13using namespace boost::variant2;
14
15int main()
16{
17 {
18 variant<int> v;
19 BOOST_TEST( holds_alternative<int>( v ) );
20 }
21
22 {
23 variant<int, float> v;
24 BOOST_TEST( holds_alternative<int>( v ) );
25 BOOST_TEST( !holds_alternative<float>( v ) );
26 }
27
28 {
29 variant<int, float> v( 3.14f );
30 BOOST_TEST( !holds_alternative<int>( v ) );
31 BOOST_TEST( holds_alternative<float>( v ) );
32 }
33
34 {
35 variant<int, float, float> v;
36 BOOST_TEST( holds_alternative<int>( v ) );
37 }
38
39 {
40 variant<int, int, float> v( 3.14f );
41 BOOST_TEST( holds_alternative<float>( v ) );
42 }
43
44 {
45 variant<int, float, std::string> v;
46 BOOST_TEST( holds_alternative<int>( v ) );
47 BOOST_TEST( !holds_alternative<float>( v ) );
48 BOOST_TEST( !holds_alternative<std::string>( v ) );
49 }
50
51 {
52 variant<int, float, std::string> v( 3.14f );
53 BOOST_TEST( !holds_alternative<int>( v ) );
54 BOOST_TEST( holds_alternative<float>( v ) );
55 BOOST_TEST( !holds_alternative<std::string>( v ) );
56 }
57
58 {
59 variant<int, float, std::string> v( "text" );
60 BOOST_TEST( !holds_alternative<int>( v ) );
61 BOOST_TEST( !holds_alternative<float>( v ) );
62 BOOST_TEST( holds_alternative<std::string>( v ) );
63 }
64
65 {
66 variant<int, int, float, std::string> v( 3.14f );
67 BOOST_TEST( holds_alternative<float>( v ) );
68 BOOST_TEST( !holds_alternative<std::string>( v ) );
69 }
70
71 {
72 variant<int, int, float, std::string> v( "text" );
73 BOOST_TEST( !holds_alternative<float>( v ) );
74 BOOST_TEST( holds_alternative<std::string>( v ) );
75 }
76
77 return boost::report_errors();
78}
79

source code of boost/libs/variant2/test/variant_holds_alternative.cpp