1 | // make_shared_perfect_forwarding_test.cpp - a test of make_shared |
---|---|
2 | // perfect forwarding of constructor arguments when using a C++0x |
3 | // compiler. |
4 | // |
5 | // Copyright 2009 Frank Mori Hess |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. |
8 | // See accompanying file LICENSE_1_0.txt or copy at |
9 | // http://www.boost.org/LICENSE_1_0.txt |
10 | |
11 | #include <boost/core/lightweight_test.hpp> |
12 | #include <boost/make_shared.hpp> |
13 | #include <boost/shared_ptr.hpp> |
14 | |
15 | #if defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
16 | |
17 | int main() |
18 | { |
19 | return 0; |
20 | } |
21 | |
22 | #else // !defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
23 | |
24 | class myarg |
25 | { |
26 | public: |
27 | myarg() |
28 | {} |
29 | private: |
30 | myarg(myarg && other) |
31 | {} |
32 | myarg& operator=(myarg && other) |
33 | { |
34 | return *this; |
35 | } |
36 | myarg(const myarg & other) |
37 | {} |
38 | myarg& operator=(const myarg & other) |
39 | { |
40 | return *this; |
41 | } |
42 | }; |
43 | |
44 | class X |
45 | { |
46 | public: |
47 | enum constructor_id |
48 | { |
49 | move_constructor, |
50 | const_ref_constructor, |
51 | ref_constructor |
52 | }; |
53 | |
54 | X(myarg &&arg): constructed_by_(move_constructor) |
55 | {} |
56 | X(const myarg &arg): constructed_by_(const_ref_constructor) |
57 | {} |
58 | X(myarg &arg): constructed_by_(ref_constructor) |
59 | {} |
60 | |
61 | constructor_id constructed_by_; |
62 | }; |
63 | |
64 | struct Y |
65 | { |
66 | Y(int &value): ref(value) |
67 | {} |
68 | int &ref; |
69 | }; |
70 | |
71 | int main() |
72 | { |
73 | { |
74 | myarg a; |
75 | boost::shared_ptr< X > x = boost::make_shared< X >(args&: a); |
76 | BOOST_TEST( x->constructed_by_ == X::ref_constructor); |
77 | } |
78 | { |
79 | const myarg ca; |
80 | boost::shared_ptr< X > x = boost::make_shared< X >(args: ca); |
81 | BOOST_TEST( x->constructed_by_ == X::const_ref_constructor); |
82 | } |
83 | { |
84 | boost::shared_ptr< X > x = boost::make_shared< X >(args: myarg()); |
85 | BOOST_TEST( x->constructed_by_ == X::move_constructor); |
86 | } |
87 | { |
88 | int value = 1; |
89 | boost::shared_ptr< Y > y = boost::make_shared< Y >(args&: value); |
90 | BOOST_TEST( y->ref == 1 && value == y->ref ); |
91 | ++y->ref; |
92 | BOOST_TEST( value == y->ref ); |
93 | } |
94 | |
95 | return boost::report_errors(); |
96 | } |
97 | |
98 | #endif // !defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
99 |