1 /* The assign_or_swap() utility functions.
2 Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
3 Copyright (C) 2010-2016 BUGSENG srl (http://bugseng.com)
4
5 This file is part of the Parma Polyhedra Library (PPL).
6
7 The PPL is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 The PPL is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
20
21 For the most up-to-date information see the Parma Polyhedra Library
22 site: http://bugseng.com/products/ppl/ . */
23
24 #ifndef PPL_assign_or_swap_hh
25 #define PPL_assign_or_swap_hh 1
26
27 #include "meta_programming.hh"
28 #include "Has_Assign_Or_Swap.hh"
29 #include "Slow_Copy.hh"
30
31 namespace Parma_Polyhedra_Library {
32
33 #ifdef PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS
34 /*! \ingroup PPL_CXX_interface
35 If there is an assign_or_swap() method, use it.
36 */
37 #endif // defined(PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS)
38 template <typename T>
39 inline typename Enable_If<Has_Assign_Or_Swap<T>::value, void>::type
assign_or_swap(T & to,T & from)40 assign_or_swap(T& to, T& from) {
41 to.assign_or_swap(from);
42 }
43
44 #ifdef PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS
45 /*! \ingroup PPL_CXX_interface
46 If there is no assign_or_swap() method but copies are not slow, copy.
47 */
48 #endif // defined(PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS)
49 template <typename T>
50 inline typename Enable_If<!Has_Assign_Or_Swap<T>::value
51 && !Slow_Copy<T>::value, void>::type
assign_or_swap(T & to,T & from)52 assign_or_swap(T& to, T& from) {
53 to = from;
54 }
55
56 #ifdef PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS
57 /*! \ingroup PPL_CXX_interface
58 If there is no assign_or_swap() and copies are slow, delegate to swap().
59 */
60 #endif // defined(PPL_DOXYGEN_INCLUDE_IMPLEMENTATION_DETAILS)
61 template <typename T>
62 inline typename Enable_If<!Has_Assign_Or_Swap<T>::value
63 && Slow_Copy<T>::value, void>::type
assign_or_swap(T & to,T & from)64 assign_or_swap(T& to, T& from) {
65 using std::swap;
66 swap(to, from);
67 }
68
69 } // namespace Parma_Polyhedra_Library
70
71 #endif // !defined(PPL_assign_or_swap_hh)
72