ceph/src/boost/libs/smart_ptr/test/weak_ptr_alias_move_test.cpp

   1
   2 // weak_ptr_alias_move_test.cpp
   3 //
   4 // Copyright 2007, 2019 Peter Dimov
   5 //
   6 // Distributed under the Boost Software License, Version 1.0. (See
   7 // accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9
  10
  11 #include <boost/core/lightweight_test.hpp>
  12 #include <boost/weak_ptr.hpp>
  13 #include <boost/shared_ptr.hpp>
  14 #include <boost/config.hpp>
  15 #include <memory>
  16 #include <cstddef>
  17
  18 #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
  19
  20 class incomplete;
  21
  22 struct X
  23 {
  24     int v_;
  25
  26     explicit X( int v ): v_( v )
  27     {
  28     }
  29
  30     ~X()
  31     {
  32         v_ = 0;
  33     }
  34 };
  35
  36 template<class P1, class P2> bool share_ownership( P1 const& p1, P2 const& p2 )
  37 {
  38     return !p1.owner_before( p2 ) && !p2.owner_before( p1 );
  39 }
  40
  41 int main()
  42 {
  43     {
  44         boost::shared_ptr<float> p( new float );
  45         boost::weak_ptr<float> p2( p );
  46
  47         int m2 = 0;
  48         boost::weak_ptr<int const volatile> p3( std::move( p2 ), &m2 );
  49
  50         BOOST_TEST( p3.use_count() == p.use_count() );
  51         BOOST_TEST( share_ownership( p, p3 ) );
  52         BOOST_TEST( p3.lock().get() == &m2 );
  53
  54         BOOST_TEST( p2.empty() );
  55     }
  56
  57     {
  58         boost::shared_ptr<incomplete> p;
  59         boost::weak_ptr<incomplete> p2( p );
  60
  61         int m2 = 0;
  62         boost::weak_ptr<int const volatile> p3( std::move( p2 ), &m2 );
  63
  64         BOOST_TEST( p3.use_count() == p.use_count() );
  65         BOOST_TEST( share_ownership( p, p3 ) );
  66         BOOST_TEST( p3.lock().get() == 0 );
  67
  68         BOOST_TEST( p2.empty() );
  69     }
  70
  71     {
  72         boost::shared_ptr<X> p( new X( 5 ) );
  73         boost::weak_ptr<X> p2( p );
  74
  75         boost::weak_ptr<int const volatile> p3( std::move( p2 ), &p2.lock()->v_ );
  76
  77         BOOST_TEST( p3.use_count() == p.use_count() );
  78         BOOST_TEST( share_ownership( p, p3 ) );
  79         BOOST_TEST( p3.lock().get() == &p->v_ );
  80
  81         BOOST_TEST( p2.empty() );
  82
  83         p.reset();
  84         BOOST_TEST( p3.expired() );
  85     }
  86
  87     return boost::report_errors();
  88 }
  89
  90 #else // defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
  91
  92 int main()
  93 {
  94     return 0;
  95 }
  96
  97 #endif