Re: [boost] Boost.SQL?

Subject: Re: [boost] Boost.SQL?
From: Roland Bock (rbock_at_[hidden])
Date: 2010-09-15 15:50:42

On 09/15/2010 07:38 PM, Eric Niebler wrote:
> On 9/15/2010 1:38 AM, Roland Bock wrote:
>    
>> On 09/15/2010 06:09 AM, Eric Niebler wrote:
>>      
>>> Also, see the series of articles about Proto I'm currently publishing on
>>> cpp-next.com. Here's the latest:
>>>
>>> http://cpp-next.com/archive/2010/09/expressive-c-playing-with-syntax/
>>>        
>> Very nicely written! I'll definitely try to replace the current
>> implementation of the WHERE expression, especially since Joel has
>> offered to help with it :-)
>>
>> I probably also should use proto to build sequences of query building
>> blocks like WHERE, GROUP_BY, ORDER_BY, LIMIT. I guess I could employ
>> boost::mpl::less to make sure that a WHERE can be followed by a GROUP_BY
>> expression, but not vice versa.
>>      
> No, you'd write the grammar of your DSEL using Proto. See the docs for
> Proto grammars. The article series hasn't gotten around to talking about
> that yet.
>    
Ah, it is beginning to dawn on me :-) , see attached code. I admit, it 
took some time to sort it out, but wow, even after just peeking inside, 
I say: Proto is pretty cool!

Would you have defined the Grammar in a similar way? My solution seems a 
bit counter-intuitive to me because it describes the allowed c++-code 
from right to left...

Regards,

Roland