Re: lexical_cast question

From: Vladimir Prus (ghost_at_[hidden])
Date: 2001-02-22 07:24:36

Kevlin Henney wrote:

>>At the moment lexical_cast<string>(whatever) will fail if 'whatever' 
decides 
>>to insert spaces in its representation. I think that it is not very 
>>convenient. 

>You're right that it's not convenient, but I would hesitate to make
>std::string a special case.

I really think that making std::string a special case is OK, because:
1. It will always be a special case, either inside lexical_cast or in user 
code.
2. Change will add functionality, and is *very* unlikely to break anything.
3. Actually, string's operator>> has no choice but to stop when it encounters
space, for it has no knowledge what was put in the stream. lexical_cast knows 
that exactly one object was put there, so why should we pretend we don't know 
that?

> A more general solution would be to replace the expression

>	... || !(interpreter >> result) || ...

> by

>	 ... || !interpret(interpreter, result) || ...

Yes, this is shurely better. What are chances that something like this will 
be added?

-- 
Regards,	
Vladimir