bionic_macros.h revision 73c963e4c5bf111df3abe9ad7eac98a918b88bb3 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _BIONIC_MACROS_H_
18#define _BIONIC_MACROS_H_
19
20// DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions.
21// It goes in the private: declarations in a class.
22#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
23  TypeName(const TypeName&);               \
24  void operator=(const TypeName&)
25
26// A macro to disallow all the implicit constructors, namely the
27// default constructor, copy constructor and operator= functions.
28//
29// This should be used in the private: declarations for a class
30// that wants to prevent anyone from instantiating it. This is
31// especially useful for classes containing only static methods.
32#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
33  TypeName();                                    \
34  DISALLOW_COPY_AND_ASSIGN(TypeName)
35
36#define BIONIC_ALIGN(value, alignment) \
37  (((value) + (alignment) - 1) & ~((alignment) - 1))
38
39#define BIONIC_ROUND_UP_POWER_OF_2(value) \
40  (sizeof(value) == 8) \
41    ? (1UL << (64 - __builtin_clzl(static_cast<unsigned long>(value)))) \
42    : (1UL << (32 - __builtin_clz(static_cast<unsigned int>(value))))
43
44#endif // _BIONIC_MACROS_H_
45