Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  */
       9             : 
      10             : #ifndef INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_CLONE_HXX
      11             : #define INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_CLONE_HXX
      12             : 
      13             : namespace detail
      14             : {
      15             : 
      16             : template<typename T>
      17             : struct has_clone
      18             : {
      19             :     template<typename U, U x>
      20             :     struct test;
      21             : 
      22             :     typedef char yes;
      23             :     typedef struct { char a[2]; } no;
      24             : 
      25             :     template<typename U>
      26             :     static yes& check_sig(U*, test<U* (U::*)() const, &U::clone>* = 0);
      27             :     template<typename U>
      28             :     static no& check_sig(...);
      29             : 
      30             :     enum
      31             :     {
      32             :         value = sizeof(check_sig<T>(0)) == sizeof(yes)
      33             :     };
      34             : };
      35             : 
      36             : template<typename T, bool HasClone>
      37             : struct cloner
      38             : {
      39         270 :     static T* clone(T* const other)
      40             :     {
      41         270 :         return new T(*other);
      42             :     }
      43             : };
      44             : 
      45             : template<typename T>
      46             : struct cloner<T, true>
      47             : {
      48         448 :     static T* clone(T* const other)
      49             :     {
      50         448 :         return other->clone();
      51             :     }
      52             : };
      53             : 
      54             : }
      55             : 
      56             : /** Creates a new copy of the passed object.
      57             :     If other is 0, just returns 0. Otherwise, if other has function
      58             :     named clone with signature T* (T::*)() const, the function is called.
      59             :     Otherwise, copy constructor is used.
      60             : 
      61             :     @returns 0 or newly allocated object
      62             :  */
      63             : template<typename T>
      64         718 : T* clone(T* const other)
      65             : {
      66         718 :     return other ? ::detail::cloner<T, ::detail::has_clone<T>::value>::clone(other) : 0;
      67             : }
      68             : 
      69             : #endif // INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_CLONE_HXX
      70             : 
      71             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */