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  1. //: C21:copy_if.h
  2. // From Thinking in C++, 2nd Edition
  3. // Available at http://www.BruceEckel.com
  4. // (c) Bruce Eckel 1999
  5. // Copyright notice in Copyright.txt
  6. // Roll your own STL-style algorithm
  7. #ifndef COPY_IF_H
  8. #define COPY_IF_H
  9.  
  10. template<typename ForwardIter,
  11.   typename OutputIter, typename UnaryPred>
  12. OutputIter copy_if(ForwardIter begin, ForwardIter end,
  13.   OutputIter dest, UnaryPred f) {
  14.   while(begin != end) {
  15.     if(f(*begin))
  16.       *dest++ = *begin;
  17.     begin++;
  18.   }
  19.   return dest;
  20. }
  21. #endif // COPY_IF_H ///:~
  22.