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| -rw-r--r-- | include/iprt/cpp/utils.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/include/iprt/cpp/utils.h b/include/iprt/cpp/utils.h new file mode 100644 index 00000000..d4131e87 --- /dev/null +++ b/include/iprt/cpp/utils.h @@ -0,0 +1,139 @@ +/** @file + * IPRT - C++ Utilities (useful templates, defines and such). + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + +#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 */ + |