Re: [boost] Alternative solution to intermediate results problem ofexpression templates.

From: Korcan Hussein (korcan_h_at_[hidden])
Date: 2005-10-23 09:57:34

"Korcan Hussein" <korcan_h_at_[hidden]> wrote in message 
news:djg7t5$li$1_at_sea.gmane.org...
> "Larry Evans" <cppljevans_at_[hidden]> wrote in message 
> news:435B9E00.3030607_at_cox-internet.com...
>> On 10/22/2005 06:58 AM, Larry Evans wrote:
>> Are you suggesting this as an alternative to Spirit subrules?
>
> Doesn't need to replace subrules but could be an alternative 
> implementation for them, if you read the part:
>
> [qoute]
> ... It might not be apparent but behind the scenes, plain rules are 
> actually implemented using a pointer to a runtime polymorphic abstract 
> class that holds the dynamic type of the parser assigned to it. When a 
> Spirit expression is assigned to a rule, its type is encapsulated in a 
> concrete subclass of the abstract class. A virtual parse function 
> delegates the parsing to the encapsulated object.
> Rules have drawbacks though:
>
> It is coupled to a specific scanner type. The rule is tied to a specific 
> scanner [see The Scanner Business].
> The rule's parse member function has a virtual function call overhead that 
> cannot be inlined.
>
> [/quote]
>
> That is what automatic type erasing is, i think there is an alternative to 
> this that might be worth investigating if not done so already. I'm just on 
> the verge of finishing make my (simple, primitive) example tidy, should be 
> up in a thew hours.
>
>
>
I made a mistake there, that was about rules :/ well i'm not sure how 
subrules i implementated but this could be an alternative implementation for 
rules i suppose.