| 1 | /** @file
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| 2 | * innotek Portable Runtime - C++ Extensions: memory.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2007 innotek GmbH
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License as published by the Free Software Foundation,
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| 12 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 13 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 14 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | */
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| 16 |
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| 17 | #ifndef ___iprt_memory___
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| 18 | #define ___iprt_memory___
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| 19 |
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| 20 | /** @defgroup grp_rt_cppx_memory innotek Portable Runtime C++ Extensions: memory
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| 21 | * @ingroup grp_rt_cppx
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| 22 | * @{
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| 23 | */
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| 24 |
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| 25 | #ifdef __cplusplus
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| 26 |
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| 27 | #include <memory> /* for auto_ptr */
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| 28 |
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| 29 | namespace cppx
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| 30 | {
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| 31 |
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| 32 | /**
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| 33 | * A simple std::auto_ptr extension that adds CopyConstructible and
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| 34 | * Assignable semantics.
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| 35 | *
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| 36 | * Instances of this class, when constructed from or assigned with instances
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| 37 | * of the same class, create a copy of the managed object using the new
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| 38 | * operator and the managed object's copy constructor, as opposed to
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| 39 | * std::auto_ptr which simply transfers ownership in these cases.
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| 40 | *
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| 41 | * This template is useful for member variables of a class that store
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| 42 | * dynamically allocated instances of some other class and these instances
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| 43 | * need to be copied when the containing class instance is copied itself.
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| 44 | *
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| 45 | * Be careful when returning instances of this class by value: it will call
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| 46 | * cause to create a copy of the managed object which is probably is not what
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| 47 | * you want, especially if its constructor is quite an expensive operation.
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| 48 | */
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| 49 | template <typename T>
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| 50 | class auto_copy_ptr : public std::auto_ptr <T>
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| 51 | {
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| 52 | public:
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| 53 |
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| 54 | /** @see std::auto_ptr <T>::auto_ptr() */
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| 55 | auto_copy_ptr (T *p = 0) throw() : std::auto_ptr <T> (p) {}
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| 56 |
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| 57 | /**
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| 58 | * Copy constructor.
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| 59 | * Takes a copy of the given instance by taking a copy of the managed
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| 60 | * object using its copy constructor. Both instances will continue to own
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| 61 | * their objects.
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| 62 | */
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| 63 | auto_copy_ptr (const auto_copy_ptr &that) throw()
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| 64 | : std::auto_ptr <T> (that.get() ? new T (*that.get()) : NULL) {}
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| 65 |
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| 66 | /**
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| 67 | * Assignment operator.
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| 68 | * Takes a copy of the given instance by taking a copy of the managed
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| 69 | * object using its copy constructor. Both instances will continue to own
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| 70 | * their objects.
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| 71 | */
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| 72 | auto_copy_ptr &operator= (const auto_copy_ptr &that) throw()
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| 73 | {
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| 74 | std::auto_ptr <T>::reset (that.get() ? new T (*that.get()) : NULL);
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| 75 | return *this;
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| 76 | }
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| 77 | };
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| 78 |
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| 79 | }; /* namespace cppx */
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| 80 |
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| 81 |
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| 82 | #endif /* __cplusplus */
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| 83 |
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| 84 | /** @} */
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| 85 |
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| 86 | #endif
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