| 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 |