[Boost-bugs] [Boost C++ Libraries] #5164: STL string::find

Subject: [Boost-bugs] [Boost C++ Libraries] #5164: STL string::find
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-02-06 15:51:25

#5164: STL string::find
------------------------------------+---------------------------------------
 Reporter:  mailsystems@…           |       Owner:         
     Type:  Bugs                    |      Status:  new    
Milestone:  To Be Determined        |   Component:  None   
  Version:                          |    Severity:  Problem
 Keywords:                          |  
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 string::find  bug

 Return Value
 The position of the first occurrence in the string of the searched
 content.
 If the content is not found, the member value '''npos''' is returned.

 string::npos - return max allowed string size

 Example - return all founded position in string

 int main()
 {
     string str = "aaaaaaaaaaaaaaaaa"; // base string
     string search_str = ""; // epmty string for search

     size_t found_pos; // found position
     size_t start_pos = 0; // start position

     while((found_pos = str.find(search_str, start_pos) != string::npos)
     {
            cout << "Found position: " << found_pos << " Start position: "
 << start_pos << endl;

           start_pos =  found_pos + search_str.size(); // search next

     }
 }


 If '''string::find''' function first argument is uninitialized variable,
 then function '''string::find''' return '''0''' (zero) not
 '''string::npos''' and when while is loop still '''found_pos ==
 string::npos'''.

 Same affect if '''string search_str;'''

 Thanks

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5164>
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