3
是否有类似于Well, how does the custom deleter of std::unique_ptr work?的shared_ptr
s?为特定类型创建shared_ptr的默认删除程序
当我试图创建智能指针默认删除器来ALLEGRO_BITMAP
指针
namespace std {
template<>
class default_delete <ALLEGRO_BITMAP> {
public:
void operator()(ALLEGRO_BITMAP* ptr) {
al_destroy_bitmap(ptr);
}
};
}
编译器就行了
shared_ptr<ALLEGRO_BITMAP> black(al_create_bitmap(groundWidth, TILESIZE));
我知道我可以通过吐出
1>c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(696): warning C4150: deletion of pointer to 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 to function template instantiation 'void std::shared_ptr<ALLEGRO_BITMAP>::_Resetp<_Ux>(_Ux *)' being compiled
1> with
1> [
1> _Ux=ALLEGRO_BITMAP
1> ]
1> c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(482) : see reference to function template instantiation 'void std::shared_ptr<ALLEGRO_BITMAP>::_Resetp<_Ux>(_Ux *)' being compiled
1> with
1> [
1> _Ux=ALLEGRO_BITMAP
1> ]
1> c:\users\john\documents\visual studio 2013\projects\blockstacking\blockstacking\systems.cpp(190) : see reference to function template instantiation 'std::shared_ptr<ALLEGRO_BITMAP>::shared_ptr<ALLEGRO_BITMAP>(_Ux *)' being compiled
1> with
1> [
1> _Ux=ALLEGRO_BITMAP
1> ]
1> c:\users\john\documents\visual studio 2013\projects\blockstacking\blockstacking\systems.cpp(190) : see reference to function template instantiation 'std::shared_ptr<ALLEGRO_BITMAP>::shared_ptr<ALLEGRO_BITMAP>(_Ux *)' being compiled
1> with
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 to 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> with
1> [
1> _Ux=ALLEGRO_BITMAP
1> ]
1> c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(694) : see reference to class template instantiation 'std::_Ref_count<_Ux>' being compiled
1> with
1> [
1> _Ux=ALLEGRO_BITMAP
1> ]
1> c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(482) : see reference to function template instantiation 'void std::shared_ptr<ALLEGRO_BITMAP>::_Resetp<_Ux>(_Ux *)' being compiled
1> with
1> [
1> _Ux=ALLEGRO_BITMAP
1> ]
1> c:\program files (x86)\microsoft visual studio 12.0\vc\include\memory(482) : see reference to function template instantiation 'void std::shared_ptr<ALLEGRO_BITMAP>::_Resetp<_Ux>(_Ux *)' being compiled
1> with
1> [
1> _Ux=ALLEGRO_BITMAP
1> ]
删除者shared_ptr
,但我想知道是否有一种创建默认删除器的方式,所以我不必每次创建新位图时都保持传递相同的功能。
谢谢。
'shared_ptr'不使用'default_delete';只有'unique_ptr'。 'shared_ptr'默认情况下直接'删除'。 –