RAII

[cym13 via Digitalmars-d-learn]

On Thursday, 23 February 2017 at 09:52:26 UTC, Arun 
Chandrasekaran wrote:
> I'm trying to write an RAII wrapper on Linux.
>
> I understand struct in D doesn't have default constructor (for 
> .init reasons).
> I don't want to use `scope`.
>
> Is there an elegant way to achieve this in D?
>
> ```
> import core.sys.posix.pthread;
> import core.sys.posix.sys.types;
>
> /// Makes pthread_mutexattr_t cleanup easy when using exceptions
> struct mutexattr_wrapper
> {
>     /// Constructor
>     this(bool _)
>     {
>         if (pthread_mutexattr_init(&m_attr) != 0 ||
>             pthread_mutexattr_setpshared(&m_attr, 
> PTHREAD_PROCESS_SHARED)!= 0)
>           // may be I will add few more methods here
>           throw custom_exception("pthread_mutexattr_xxxx 
> failed");
>     }
>
>     /// Destructor
>     ~this() {  pthread_mutexattr_destroy(&m_attr);  }
>
>     /// This allows using mutexattr_wrapper as 
> pthread_mutexattr_t
>     alias m_attr this;
>
>     pthread_mutexattr_t m_attr;
> }
> ```

It reminds me of 
https://w0rp.com/blog/post/an-raii-constructor-by-another-name-is-just-as-sweet/ which isn't what you want but may be interesting anyway.