c++ - CComPtr and reference count -

i using objects of type ccomptr. having memory leak problems. in particular, have following code:

ccomptr<id2d1bitmap> bitmap = create_bitmap(bitmapsize); auto n = count_ref((id2d1bitmap*)bitmap); 

where:

template<class interface> ulong count_ref(interface* pinterface) noexcept {     if (pinterface)     {         pinterface->addref();         return pinterface->release();     }      return 0; } 

and:

id2d1bitmap* create_bitmap(const d2d1_size_u& size) {     id2d1bitmap* bitmap;     createbitmap(&bitmap);      return bitmap; } 

i expecting value of n equal 1 equal 2. why reference count of ccomptr not 1?

am using ccomptr object properly?

and when process terminates following memory leak:

an interface [072b1f50] created not released. use 'dps 072b1f20' view allocation stack. object type: id2d1bitmap     device-dependent size: 1000 x 600     device-independent size: 1000.00 x 600.00     format: dxgi_format_b8g8r8a8_unorm     alpha mode: d2d1_alpha_mode_premultiplied     outstanding reference count: 1  d2d debug error - memory leaks detected. 

with ccomptr need use raw interface pointer types.

you can make way, example:

ccomptr<id2d1bitmap> create_bitmap(const d2d1_size_u& size) {     ccomptr<id2d1bitmap> bitmap;     createbitmap(&bitmap); // declared createbitmap(id2d1bitmap**);     return bitmap; }  ccomptr<id2d1bitmap> pbitmap = create_bitmap(...); ... 

ccomptr class manage references accurately along way pass pointers: local variable, return value, new local value. optimizing compiler in release builds removes of excessive addref/releases too, don't need worry them.