c++11 - Creating a default deleter for shared_ptr for a specific type -


is there similar well, how custom deleter of std::unique_ptr work? shared_ptrs?

when try creating default deleter smart pointers allegro_bitmap pointers

namespace std {     template<>     class default_delete < allegro_bitmap > {     public:         void operator()(allegro_bitmap* ptr) {             al_destroy_bitmap(ptr);         }     }; }

the compiler spits out 

1>c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(696): warning c4150: deletion of pointer incomplete type 'allegro_bitmap'; no destructor called 1>          c:\users\john\allegro\allegro-5.0.10-msvc-11.0\include\allegro5\bitmap.h(12) : see declaration of 'allegro_bitmap' 1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(482) : see reference function template instantiation 'void std::shared_ptr<allegro_bitmap>::_resetp<_ux>(_ux *)' being compiled 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ] 1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(482) : see reference function template instantiation 'void std::shared_ptr<allegro_bitmap>::_resetp<_ux>(_ux *)' being compiled 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ] 1>          c:\users\john\documents\visual studio 2013\projects\blockstacking\blockstacking\systems.cpp(190) : see reference function template instantiation 'std::shared_ptr<allegro_bitmap>::shared_ptr<allegro_bitmap>(_ux *)' being compiled 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ] 1>          c:\users\john\documents\visual studio 2013\projects\blockstacking\blockstacking\systems.cpp(190) : see reference function template instantiation 'std::shared_ptr<allegro_bitmap>::shared_ptr<allegro_bitmap>(_ux *)' being compiled 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ] 1>c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(159): warning c4150: deletion of pointer incomplete type 'allegro_bitmap'; no destructor called 1>          c:\users\john\allegro\allegro-5.0.10-msvc-11.0\include\allegro5\bitmap.h(12) : see declaration of 'allegro_bitmap' 1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(158) : while compiling class template member function 'void std::_ref_count<_ux>::_destroy(void)' 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ] 1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(694) : see reference class template instantiation 'std::_ref_count<_ux>' being compiled 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ] 1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(482) : see reference function template instantiation 'void std::shared_ptr<allegro_bitmap>::_resetp<_ux>(_ux *)' being compiled 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ] 1>          c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(482) : see reference function template instantiation 'void std::shared_ptr<allegro_bitmap>::_resetp<_ux>(_ux *)' being compiled 1>          1>          [ 1>              _ux=allegro_bitmap 1>          ]

on line

shared_ptr<allegro_bitmap> black(al_create_bitmap(groundwidth, tilesize));

i realize can pass deleter shared_ptr, wondering if there way create default deleter don't have keep passing in same function every time create new bitmap.

thanks.

if can enforce convention allocate via std::make_unique work:

std::shared_ptr<allegro_bitmap> bmp; ... bmp = std::make_unique<allegro_bitmap>();

the deleter move object, , therefore default_delete called upon object destruction. unfortunately, compiler can't enforce convention; not without custom types.


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