RE: [boost] Re: static sized strings

From: Reece Dunn (msclrhd_at_[hidden])
Date: 2004-06-21 07:46:35

John Nagle wrote:
>Reece Dunn wrote:
>>John Nagle wrote:
>>The problems arise in the interation with basic_string_impl and how to 
>>implement swap and functions that require constructing a string object.
>Why do you need to construct a string object to swap?
>Just swap one character at a time.

There were 3 things I was cxonsidering when moving to the non-virtual 
implementation:

[1] How do I pass the buffer and capacity to the implementation while 
allowing both fixed_string_base and fixed_string access to the basic_string 
interface? I have chosen to route the data through one of the basic_string 
constructors, requiring a const_cast. This is the best approach AFAICS.

[2] How do I implement the swap function? The solution I arrived at is the 
one you suggest: to swap the data character-by-character. What you have to 
consider when doing this is that the strings don't exceed capacity, 
resulting in additional logic.

[3] How do I approach the substr function and the + operators? Although it 
is now possible to construct a fixed_string_base object from a fixed_string 
object, you will run into problems when constructing from a temporary 
(because the fixed_string temporary will have been destroyed, invalidating 
the buffer).

Given this, the implementation of these functions are still in fixed_string 
and thus not accessible to [w]char_string.

I have replaced the old implementation with this one in the sandbox if you 
want to take a look. Also, feel free to adapt it to your version if you 
want.

Regards,
Reece

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