unique_ptr | Unique for autoclose handle

[Vitaliy Fadeev]

On Wednesday, 14 December 2022 at 17:44:05 UTC, Ali Çehreli wrote:
> On 12/14/22 09:41, Ali Çehreli wrote:
>
> >     // According to documentation, the handler must be
> created dynamically:
> >     // We make a unique owner for it:
>

Last try is customized **std.typecons.Unique**:

```
module safehandle;

import core.sys.windows.windows;
import std.typecons;

struct Unique( T, alias DTOR )
{
     ...

     ~this()
     {
         if (_p !is null)
         {
             DTOR( _p );
             destroy(_p);
             _p = null;
         }
     }

    ...
}

alias SafeHandle = Unique!(void,CloseHandle);
```

and using :

```
SafeHandle open_keyboard_device2( ... )
{
     ...

     SafeHandle dev_handle =
         CreateFileW( ... );

     ...

     return dev_handle;
}
```

```
void main()
{
     ...

     auto dev = open_keyboard_device2( ... );
     process_device( dev );

     ...

     // auto-close handle
}
```

Open source is good!
Thanks all!

and in future:
```
alias SafeHandle        = Unique!(void,CloseHandle)
alias Safe_SDL_Window   = Unique!(SDL_Window,SDL_DestroyWindow)
alias Safe_SDL_Surface  = Unique!(SDL_Surface,SDL_FreeSurface)
alias Safe_SDL_Texture  = Unique!(SDL_Texture,SDL_DestroyTexture)
alias Safe_SDL_Renderer = 
Unique!(SDL_Renderer,SDL_DestroyRenderer)
```
Code is good, but testing....