Sub-classing exceptions

[Shriramana Sharma via Digitalmars-d]

Jacob Carlborg wrote:

> On 2015-10-15 20:07, Shriramana Sharma wrote:
> 
>> $ cat myexception.d
>> string ExceptionDeclaration(string newExceptionName, string
>> baseExceptionName = "Exception")
>> {
>>      return "class " ~ newExceptionName ~ ": " ~ baseExceptionName ~ `{
>>          this(string msg = "", string file = __FILE__, size_t line =
>> __LINE__)
>>              { super(msg, file, line); }
>>          }`;
>> }
> 
> I think constructors should be inherited.

Yes the constructors are inherited, but the problem, as I illustrated, is 
that the inherited constructor gets the __FILE__ and __LINE__ data for the 
point of declaring the exception subclass, and not at the point of throwing 
it.

> If you declare the subclass as usual you can have a template mixin that
> adds the constructor.
> 
> class SubException : Exception
> {
>      mixin ExceptionConstructors;
> }

Hmmm is that in any way advantageous to what I wrote about it? Is it just 
that you can now add a doc-comment that DDoc can recognize?

-- 
Shriramana Sharma, Penguin #395953