Question in using boose::tokernizer [How to tell how many tokens in a string]

Here is the code.
How can I tell how many tokens in tok? Is there a "size()" like STL containers?
Of course I can use an iterator in a 'for' loop to scan and count, but is there an Off-The-Shelf function?

Code:

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#include <boost/tokenizer.hpp>

    string iine("123#456#789");
    typedef boost::tokenizer< boost::char_separator<char> > token;           
    boost::char_separator<char> sep("#");                                     
    token tok(line, sep);                                                     

    cout<<tok.size()<<endl // Is there a function like this?

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Quote:

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Originally Posted by meili100

Here is the code.
How can I tell how many tokens in tok? Is there a "size()" like STL containers?
Of course I can use an iterator in a 'for' loop to scan and count, but is there an Off-The-Shelf function?

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I don't think so. The tokenizer only consumes input when you request the next token. This method of operation is fundamentally incompatible with being able to get the token count up-front. Just tokenize, and count.

There's std::distance, which does the counting for you.