Re: [boost] [review] Review of Exception begins today

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-09-30 20:38:26

Tobias Schwinger wrote:
> Emil Dotchevski wrote:
>>> I'm not keen on the use of operator<< to add the data to the exceptions.
>> I do share your concern, but consider that whatever we use for boost
>> exception should support easy composition, because it needs to work
>> when used in a throw expression directly:
>>
>> throw my_error() <<
>>     error_info<tag_errno>(errno) <<
>>     error_info<tag_name>(name);
>>
>> Instead of << we could use .add:
>>
>> throw my_error().
>>     add(error_info<tag_errno>(errno)).
>>     add(error_info<tag_name>(name));
>>
>> This isn't bad, but in my opinion the << syntax is better despite my
>> strong dislike for operator overloading.
> 
> Maybe a more or less obvious choice will do
> 
>     throw my_error() = error_info<tag>(whatever),
>         error_info<another_tag>(something_else) // ...
> 

Forgot to say: See Boost.Assign.

Making 'add' a function template might be another alternative:

     throw my_error()
         .add<tag::errno>(errno)
         .add<tag::name>(name)
         // ...

Regards,
Tobias Schwinger
- Review Manager -