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MyGUI_Bitwise.h
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1
6 /*
7 This file is part of MyGUI.
8
9 MyGUI is free software: you can redistribute it and/or modify
10 it under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation, either version 3 of the License, or
12 (at your option) any later version.
13
14 MyGUI is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public License
20 along with MyGUI. If not, see <http://www.gnu.org/licenses/>.
21 */
22 #ifndef __MYGUI_BITWISE_H__
23 #define __MYGUI_BITWISE_H__
24
25 #include "MyGUI_Prerequest.h"
26
27 namespace MyGUI
28 {
29
30 class Bitwise
31 {
32 public:
35 template<typename Type>
36 static MYGUI_FORCEINLINE Type firstPO2From(Type _value)
37 {
38 --_value;
39 _value |= _value >> 16;
40 _value |= _value >> 8;
41 _value |= _value >> 4;
42 _value |= _value >> 2;
43 _value |= _value >> 1;
44 ++_value;
45 return _value;
46 }
47
49 template<typename Type>
50 static MYGUI_FORCEINLINE bool isPO2(Type _value)
51 {
52 return (_value & (_value - 1)) == 0;
53 }
54
58 template<typename Type>
59 static MYGUI_FORCEINLINE size_t getBitShift(Type _mask)
60 {
61 if (_mask == 0)
62 return 0;
63
64 size_t result = 0;
65 while ((_mask & 1) == 0)
66 {
67 ++result;
68 _mask >>= 1;
69 }
70 return result;
71 }
72 };
73
74 } // namespace MyGUI
75
76 #endif // __MYGUI_BITWISE_H__
MyGUI::Bitwise::getBitShift
static __inline size_t getBitShift(Type _mask)
Definition: MyGUI_Bitwise.h:59
MyGUI_Prerequest.h
MyGUI::Bitwise
Definition: MyGUI_Bitwise.h:30
MyGUI::Bitwise::firstPO2From
static __inline Type firstPO2From(Type _value)
Definition: MyGUI_Bitwise.h:36
MyGUI::Bitwise::isPO2
static __inline bool isPO2(Type _value)
Definition: MyGUI_Bitwise.h:50
MYGUI_FORCEINLINE
#define MYGUI_FORCEINLINE
Definition: MyGUI_Platform.h:71