xapian-core  1.4.21
alignment_cast.h
Go to the documentation of this file.
1 
4 /* Copyright (C) 2016 Olly Betts
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to
8  * deal in the Software without restriction, including without limitation the
9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10  * sell copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22  * IN THE SOFTWARE.
23  */
24 
25 #ifndef XAPIAN_INCLUDED_ALIGNMENT_CAST_H
26 #define XAPIAN_INCLUDED_ALIGNMENT_CAST_H
27 
28 #include <type_traits>
29 
37 template<typename T, typename U>
38 typename std::enable_if<std::is_const<typename std::remove_pointer<U>::type>::value, T>::type
40 {
41  return static_cast<T>(static_cast<const void*>(ptr));
42 }
43 
51 template<typename T, typename U>
52 typename std::enable_if<!std::is_const<typename std::remove_pointer<U>::type>::value, T>::type
54 {
55  return static_cast<T>(static_cast<void*>(ptr));
56 }
57 
58 #endif /* XAPIAN_INCLUDED_ALIGNMENT_CAST_H */
std::enable_if< std::is_const< typename std::remove_pointer< U >::type >::value, T >::type alignment_cast(U ptr)
Cast a pointer we know is suitably aligned.