i know you can use both
throw new Exception(msg);
and

module test;

class testException {
     this (string msg) {
          super("some error info : "~msg);
     }
}

throw new testException(msg);

but which one is better conforms to the d style?

Sean Campbell:

> but which one is better conforms to the d style?

Both are valid. Use the second when you want a more precise exception in your code, this is common in larger programs.

Keep in mind that you can allocate an exception in a point and throw it in another. This reduces the runtime allocations and should allow more @nogc code.

Bye,
bearophile

On Wednesday, 25 June 2014 at 09:54:16 UTC, bearophile wrote:
> Sean Campbell:
>
>> but which one is better conforms to the d style?
>
> Both are valid. Use the second when you want a more precise exception in your code, this is common in larger programs.
>
> Keep in mind that you can allocate an exception in a point and throw it in another. This reduces the runtime allocations and should allow more @nogc code.
>
> Bye,
> bearophile

Thank you very much for the quick reply, and a method to save memory.