Re: [boost] Re: smart_ptr and handles

From: Peter Dimov (pdimov_at_[hidden])
Date: 2004-12-29 09:44:22

Jonathan Wakely wrote:
>    struct DCReleaser
>    {
>        DCReleaser(HWND hwnd) : hwnd(hwnd) {}
>        void operator()(void* p) { ReleaseDC( hwnd, (HDC)p ); }
>        HWND hwnd;
>    };
>
>    handle make_dc( HWND hWnd )
>    {
>       return handle( GetDC( hWnd ), DCReleaser(hWnd) );
>    }

Yep. Note also that shared_ptr will call the deleter with an HDC, not a 
void*, so the cast in operator() is not necessary:

       void operator()(HDC p) const { ReleaseDC( hwnd, p ); }

> I think bind(ReleaseDC, hWnd, _1) should work.

That's what I'd use, too. :-)