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