List of Phobos functions that allocate memory?

[Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>]

On Friday, 7 February 2014 at 14:26:48 UTC, Marc Schütz wrote:
> or a remote server. However, I can't see how these are 
> fundamentally different from invalid user input, and indeed, 
> there's often not even a clear separation, e.g. when a user 
> asked you to read a file they don't have access to.

I agree. Any situation where it makes sense to say:

"Ouch, this is not going to work out, roll back, roll back, let's 
move out of this module! We need to try a different approach. We 
are not going to continue with anything productive down this 
lane, lets go back to the context and get into a new direction."

is suitable for exceptions and it makes code reuse, evolution and 
modification to error reporting easy.

- validation and veracity checking
- authentication failures
- database failures
- transactional retries
- serious allocation issues
- timeouts

are all fiiine for exceptions.

You get to write a request handler like this:

{
   auto sid = request.authenticate();
   auto data = 
validator(request.getPost('label1','label2','label3'));
   auto key = model.create_and_put(sid,data);
   response.writeJson(key);
   response.status = 201;
   return;
}

And you can change the error reporting at the request dispatcher 
level rather than sifting through 20 different spaghetti-like 
request handlers trying to figure out if you got it right:

{
   auto sid = request.authenticate();
   if (sid<0){
       ... return ...;
   }
   auto data = request.getPost('label1','label2','label3');
   if (data){
      data = validate(data);
      if (data){
         auto key = model.create_and_put(sid,data);
         if (item){
            auto ok = response.writeJson(key);
            if(ok){
               response.status = 201;
               return;
            }
            ....;
         } else {
            .... ;
         }
      } else {
         .... ;
      }
   } else {
     ... ;
   }
}