MySQL  8.0.18
Source Code Documentation
my_pointer_arithmetic.h
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1 #ifndef MY_POINTER_ARITHMETIC_INCLUDED
2 #define MY_POINTER_ARITHMETIC_INCLUDED
3 /*
4  Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
5 
6  This program is free software; you can redistribute it and/or modify
7  it under the terms of the GNU General Public License, version 2.0,
8  as published by the Free Software Foundation.
9 
10  This program is also distributed with certain software (including
11  but not limited to OpenSSL) that is licensed under separate terms,
12  as designated in a particular file or component or in included license
13  documentation. The authors of MySQL hereby grant you an additional
14  permission to link the program and your derivative works with the
15  separately licensed software that they have included with MySQL.
16 
17  This program is distributed in the hope that it will be useful,
18  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20  GNU General Public License, version 2.0, for more details.
21 
22  You should have received a copy of the GNU General Public License
23  along with this program; if not, write to the Free Software
24  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
25 
26 #include <stdint.h>
27 
28 /**
29  @file include/my_pointer_arithmetic.h
30  Some macros for dealing with pointer arithmetic, e.g., aligning
31  of buffers to a given size.
32 */
33 
34 #define MY_ALIGN(A, L) (((A) + (L)-1) & ~((L)-1))
35 #define ALIGN_SIZE(A) MY_ALIGN((A), sizeof(double))
36 
37 #ifdef __cplusplus
38 
39 template <typename T>
40 bool is_aligned_to(T *t, int increment) {
41  return reinterpret_cast<uintptr_t>(t) % increment == 0;
42 }
43 
44 template <typename T>
45 bool is_aligned(T *t) {
46  return is_aligned_to(t, alignof(T));
47 }
48 
49 #endif // __cplusplus
50 
51 #endif // MY_POINTER_ARITHMETIC_INCLUDED
bool is_aligned_to(T *t, int increment)
Definition: my_pointer_arithmetic.h:40
bool is_aligned(T *t)
Definition: my_pointer_arithmetic.h:45