c++ - how to use ordinary function with boost::bind -

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I have two vectors, I would like to copy the vector elements with another change in the second, something like this: 

  void addend (std :: string & amp; a, const std :: string & amp; b) {a.append (b); } Std :: vector & lt; Std :: string & gt; V1; Std :: vector & lt; Std :: string & gt; V2; ... std :: conversion (v1.begin (), v1.end (), v2.begin (), boost :: tie (attachment, std :: string ("b")));   
 How can I do this?   
 
 
 I will do something like this (cuff off):  
  For (string & s: v1) {s.append ("b"); } V2 = v1;   
 Easy to write, easy to understand, Easy to optimize compiler, SO question is not required.

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