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/** @file
* IPRT - C++ Utilities (useful templates, defines and such).
*/
/*
* Copyright (C) 2006-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_cpp_utils_h
#define IPRT_INCLUDED_cpp_utils_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/types.h>
/** @defgroup grp_rt_cpp IPRT C++ APIs */
/** @defgroup grp_rt_cpp_util C++ Utilities
* @ingroup grp_rt_cpp
* @{
*/
#define DPTR(CLASS) CLASS##Private *d = static_cast<CLASS##Private *>(d_ptr)
#define QPTR(CLASS) CLASS *q = static_cast<CLASS *>(q_ptr)
/**
* A simple class used to prevent copying and assignment.
*
* Inherit from this class in order to prevent automatic generation
* of the copy constructor and assignment operator in your class.
*/
class RTCNonCopyable
{
protected:
RTCNonCopyable() {}
~RTCNonCopyable() {}
private:
RTCNonCopyable(RTCNonCopyable const &);
RTCNonCopyable &operator=(RTCNonCopyable const &);
};
/**
* Shortcut to |const_cast<C &>()| that automatically derives the correct
* type (class) for the const_cast template's argument from its own argument.
*
* Can be used to temporarily cancel the |const| modifier on the left-hand side
* of assignment expressions, like this:
* @code
* const Class That;
* ...
* unconst(That) = SomeValue;
* @endcode
*
* @todo What to do about the prefix here?
*/
template <class C>
inline C &unconst(const C &that)
{
return const_cast<C &>(that);
}
/**
* Shortcut to |const_cast<C *>()| that automatically derives the correct
* type (class) for the const_cast template's argument from its own argument.
*
* Can be used to temporarily cancel the |const| modifier on the left-hand side
* of assignment expressions, like this:
* @code
* const Class *pThat;
* ...
* unconst(pThat) = SomeValue;
* @endcode
*
* @todo What to do about the prefix here?
*/
template <class C>
inline C *unconst(const C *that)
{
return const_cast<C *>(that);
}
/**
* Macro for generating a non-const getter version from a const getter.
*
* @param a_RetType The getter return type.
* @param a_Class The class name.
* @param a_Getter The getter name.
* @param a_ArgDecls The argument declaration for the getter method.
* @param a_ArgList The argument list for the call.
*/
#define RT_CPP_GETTER_UNCONST(a_RetType, a_Class, a_Getter, a_ArgDecls, a_ArgList) \
a_RetType a_Getter a_ArgDecls \
{ \
return static_cast< a_Class const *>(this)-> a_Getter a_ArgList; \
}
/**
* Macro for generating a non-const getter version from a const getter,
* unconsting the return value as well.
*
* @param a_RetType The getter return type.
* @param a_Class The class name.
* @param a_Getter The getter name.
* @param a_ArgDecls The argument declaration for the getter method.
* @param a_ArgList The argument list for the call.
*/
#define RT_CPP_GETTER_UNCONST_RET(a_RetType, a_Class, a_Getter, a_ArgDecls, a_ArgList) \
a_RetType a_Getter a_ArgDecls \
{ \
return const_cast<a_RetType>(static_cast< a_Class const *>(this)-> a_Getter a_ArgList); \
}
/** @} */
#endif /* !IPRT_INCLUDED_cpp_utils_h */
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