1 /*
2 Copyright 2018 Glen Joseph Fernandes
3 (glenjofe@gmail.com)
4
5 Distributed under the Boost Software License, Version 1.0.
6 (http://www.boost.org/LICENSE_1_0.txt)
7 */
8 #include <boost/config.hpp>
9 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
10 #include <boost/core/empty_value.hpp>
11 #include <boost/core/lightweight_test.hpp>
12
13 struct T1 { };
14
15 struct S1
16 : boost::empty_value<T1, 0, true> { };
17
18 struct T2 {
19 int value;
20 };
21
22 struct S2
23 : boost::empty_value<T1, 0, true>
24 , boost::empty_value<T2, 1, true> { };
25
26 struct S3
27 : boost::empty_value<T1, 0, false>
28 , boost::empty_value<T2, 1, true> { };
29
30 struct T3 { };
31
32 struct S4
33 : boost::empty_value<T1, 0, true>
34 , boost::empty_value<T3, 1, true> { };
35
36 struct S5
37 : boost::empty_value<T1, 0, false>
38 , boost::empty_value<T3, 1, false> { };
39
40 struct S6
41 : boost::empty_value<T1, 0, true>
42 , boost::empty_value<T2, 1, true>
43 , boost::empty_value<T3, 2, true> { };
44
main()45 int main()
46 {
47 BOOST_TEST(sizeof(S1) == sizeof(T1));
48 BOOST_TEST(sizeof(S2) == sizeof(T2));
49 BOOST_TEST(sizeof(S3) > sizeof(T2));
50 BOOST_TEST(sizeof(S4) == sizeof(T1));
51 BOOST_TEST(sizeof(S5) > sizeof(T1));
52 BOOST_TEST(sizeof(S6) == sizeof(T2));
53 return boost::report_errors();
54 }
55 #else
main()56 int main()
57 {
58 return 0;
59 }
60 #endif
61