1 | // make_shared_move_emulation_test.cpp - a test of make_shared |
---|---|
2 | // semi-perfect forwarding of constructor arguments when using a C++03 |
3 | // compiler with move emulation. |
4 | // Note the "semi": it means moving temporaries (real r-values) doesn't work. |
5 | // |
6 | // Copyright 2016 Giel van Schijndel |
7 | // |
8 | // Distributed under the Boost Software License, Version 1.0. |
9 | // See accompanying file LICENSE_1_0.txt or copy at |
10 | // http://www.boost.org/LICENSE_1_0.txt |
11 | |
12 | #include <boost/core/lightweight_test.hpp> |
13 | #include <boost/make_shared.hpp> |
14 | #include <boost/move/core.hpp> |
15 | #include <boost/move/utility_core.hpp> |
16 | #include <boost/shared_ptr.hpp> |
17 | |
18 | class movearg |
19 | { |
20 | private: |
21 | BOOST_MOVABLE_BUT_NOT_COPYABLE(movearg) |
22 | public: |
23 | movearg() |
24 | {} |
25 | movearg(BOOST_RV_REF(movearg)) |
26 | {} |
27 | movearg& operator=(BOOST_RV_REF(movearg)) |
28 | { |
29 | return *this; |
30 | } |
31 | }; |
32 | |
33 | class ByVal |
34 | { |
35 | public: |
36 | ByVal(movearg) {} |
37 | }; |
38 | |
39 | class ByRef |
40 | { |
41 | public: |
42 | enum constructor_id |
43 | { |
44 | move_constructor, |
45 | const_ref_constructor |
46 | }; |
47 | |
48 | ByRef(BOOST_RV_REF(movearg)): constructed_by_(move_constructor) |
49 | {} |
50 | ByRef(const movearg &arg): constructed_by_(const_ref_constructor) |
51 | {} |
52 | |
53 | constructor_id constructed_by_; |
54 | }; |
55 | |
56 | int main() |
57 | { |
58 | { |
59 | movearg a; |
60 | boost::shared_ptr< ByVal > x = boost::make_shared< ByVal >(args: boost::move(t&: a)); |
61 | } |
62 | { |
63 | movearg a; |
64 | boost::shared_ptr< ByRef > x = boost::make_shared< ByRef >(args: boost::move(t&: a)); |
65 | BOOST_TEST( x->constructed_by_ == ByRef::move_constructor); |
66 | } |
67 | #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
68 | { |
69 | boost::shared_ptr< ByVal > x = boost::make_shared< ByVal >(args: movearg()); |
70 | boost::shared_ptr< ByRef > y = boost::make_shared< ByRef >(args: movearg()); |
71 | BOOST_TEST( y->constructed_by_ == ByRef::move_constructor); |
72 | } |
73 | #endif // !defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
74 | { |
75 | const movearg ca; |
76 | boost::shared_ptr< ByRef > x = boost::make_shared< ByRef >(args: ca); |
77 | BOOST_TEST( x->constructed_by_ == ByRef::const_ref_constructor); |
78 | } |
79 | |
80 | return boost::report_errors(); |
81 | } |
82 |