Dogcows Code - chaz/yoink/blob - src/stlplus/containers/copy_functors.hpp

   1 #ifndef STLPLUS_COPY_FUNCTORS
   2 #define STLPLUS_COPY_FUNCTORS
   3 ////////////////////////////////////////////////////////////////////////////////
   4
   5 //   Author:    Andy Rushton
   6 //   Copyright: (c) Southampton University 1999-2004
   7 //              (c) Andy Rushton           2004-2009
   8 //   License:   BSD License, see ../docs/license.html
   9
  10 //   The function constructor classes below are used by the smart_ptr and the
  11 //   simple_ptr classes. They provide three (well ok, two) copying mechanisms.
  12 //   These classes have been separated from the smart_ptr header by DJDM, as
  13 //   the simple_ptr classes now also use them.
  14
  15 ////////////////////////////////////////////////////////////////////////////////
  16 #include "containers_fixes.hpp"
  17 #include "exceptions.hpp"
  18
  19 namespace stlplus
  20 {
  21
  22   ////////////////////////////////////////////////////////////////////////////////
  23   // copy functors implementing the three possible copy semantics
  24
  25   // constructor_copy uses the copy constructor of the object - used for simple types
  26
  27   template <typename T>
  28   class constructor_copy
  29   {
  30   public:
  31     T* operator() (const T& from) throw()
  32       {
  33         return new T(from);
  34       }
  35   };
  36
  37   // clone_copy uses the clone method of the object - used for polymorphic types
  38
  39   template <typename T>
  40   class clone_copy
  41   {
  42   public:
  43     T* operator() (const T& from) throw()
  44       {
  45         return from.clone();
  46       }
  47   };
  48
  49   // no_copy throws an exception - used for types that cannot be copied
  50
  51   template <typename T>
  52   class no_copy
  53   {
  54   public:
  55     T* operator() (const T& from) throw(illegal_copy)
  56       {
  57         throw illegal_copy("no_copy functor called");
  58         return 0;
  59       }
  60   };
  61
  62   ////////////////////////////////////////////////////////////////////////////////
  63
  64 } // end namespace stlplus
  65
  66 #endif