1// Copyright 2017 Peter Dimov.
2// Distributed under the Boost Software License, Version 1.0.
3
4#include <boost/tuple/tuple.hpp>
5#include <boost/core/lightweight_test.hpp>
6#include <boost/config.hpp>
7#include <boost/config/pragma_message.hpp>
8
9#if defined(BOOST_NO_CXX11_HDR_TUPLE)
10
11BOOST_PRAGMA_MESSAGE("Skipping std::tuple_size tests for lack of <tuple>")
12int main() {}
13
14#else
15
16#include <tuple>
17
18template<class Tp> void test( std::size_t x )
19{
20 BOOST_TEST_EQ( std::tuple_size< Tp >::value, x );
21 BOOST_TEST_EQ( std::tuple_size< typename Tp::inherited >::value, x );
22}
23
24struct V
25{
26};
27
28int main()
29{
30 test< boost::tuple<> >( x: 0 );
31 test< boost::tuple<V> >( x: 1 );
32 test< boost::tuple<V, V> >( x: 2 );
33 test< boost::tuple<V, V, V> >( x: 3 );
34 test< boost::tuple<V, V, V, V> >( x: 4 );
35 test< boost::tuple<V, V, V, V, V> >( x: 5 );
36 test< boost::tuple<V, V, V, V, V, V> >( x: 6 );
37 test< boost::tuple<V, V, V, V, V, V, V> >( x: 7 );
38 test< boost::tuple<V, V, V, V, V, V, V, V> >( x: 8 );
39 test< boost::tuple<V, V, V, V, V, V, V, V, V> >( x: 9 );
40 test< boost::tuple<V, V, V, V, V, V, V, V, V, V> >( x: 10 );
41
42#if !defined(BOOST_NO_CXX11_DECLTYPE)
43
44 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple())>::value, 0 );
45 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1))>::value, 1 );
46 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2))>::value, 2 );
47 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3))>::value, 3 );
48 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3, 4))>::value, 4 );
49 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3, 4, 5))>::value, 5 );
50 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3, 4, 5, 6))>::value, 6 );
51 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3, 4, 5, 6, 7))>::value, 7 );
52 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3, 4, 5, 6, 7, 8))>::value, 8 );
53 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3, 4, 5, 6, 7, 8, 9))>::value, 9 );
54 BOOST_TEST_EQ( std::tuple_size<decltype(boost::make_tuple(1, 2, 3, 4, 5, 6, 7, 8, 9, 10))>::value, 10 );
55
56#endif
57
58 return boost::report_errors();
59}
60
61#endif
62

source code of boost/libs/tuple/test/std_tuple_size.cpp