libc/private/bionic_macros.h

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _BIONIC_MACROS_H_
#define _BIONIC_MACROS_H_

// DISALLOW_COPY_AND_ASSIGN disallows the copy and operator= functions.
// It goes in the private: declarations in a class.
#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
  TypeName(const TypeName&);               \
  void operator=(const TypeName&)

// A macro to disallow all the implicit constructors, namely the
// default constructor, copy constructor and operator= functions.
//
// This should be used in the private: declarations for a class
// that wants to prevent anyone from instantiating it. This is
// especially useful for classes containing only static methods.
#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
  TypeName();                                    \
  DISALLOW_COPY_AND_ASSIGN(TypeName)

#define BIONIC_ALIGN(value, alignment) \
  (((value) + (alignment) - 1) & ~((alignment) - 1))

#define BIONIC_ROUND_UP_POWER_OF_2(value) \
  (sizeof(value) == 8) \
    ? (1UL << (64 - __builtin_clzl(static_cast<unsigned long>(value)))) \
    : (1UL << (32 - __builtin_clz(static_cast<unsigned int>(value))))

#endif // _BIONIC_MACROS_H_