Re: [boost] tokenazer: last token check

From: Iain.Hanson_at_[hidden]
Date: 2001-08-03 04:53:47

     t.end ( ) always returns an iterator that is past the end of the 
     container and not dereferenceable. This applies to all the standard 
     container iterators. Try writting:
     
     for ( tokenizer<>::iterator it = t.begin ( ); it != t.end ( ); ++it )
     {
        string next_token = *it;
     }
     
     /ikh

______________________________ Reply Separator _________________________________
Subject: [boost] tokenazer: last token check
Author:  rogeeff (rogeeff_at_[hidden]) at unix,mime
Date:    03/08/01 04:12

Hi!
     
I was hit today by very unfortunate behavior of tokenizer iterator. 
Basicly the following 2 lines cause abort:
     
        tokenizer<>::iterator it = t.end();
        it++( or *it);
     
Is it supposed to be that way? If yes - why?
     
if I need somewhere to retreive next token from iterator, I will need 
to write something like this:
     
tokenizer<>::iterator it = t.begin(); 
...
     
if( it == t.end() )
      <not found>
     
if( ++it == t.end() )
      <not found>
     
string next_token = *it;
     
Instead of :
     
string next_token = *(++it);
     
if( next_token is empty string )
    <not found>
     
Gennadiy.
     
     
     
     
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