215 lines
7.6 KiB
C++
215 lines
7.6 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/scopedptr.h
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// Purpose: scoped smart pointer class
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// Author: Jesse Lovelace <jllovela@eos.ncsu.edu>
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// Created: 06/01/02
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// Copyright: (c) Jesse Lovelace and original Boost authors (see below)
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// (c) 2009 Vadim Zeitlin
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// This class closely follows the implementation of the boost
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// library scoped_ptr and is an adaption for c++ macro's in
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// the wxWidgets project. The original authors of the boost
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// scoped_ptr are given below with their respective copyrights.
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// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
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// Copyright (c) 2001, 2002 Peter Dimov
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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// See http://www.boost.org/libs/smart_ptr/scoped_ptr.htm for documentation.
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//
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#ifndef _WX_SCOPED_PTR_H_
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#define _WX_SCOPED_PTR_H_
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#include "wx/defs.h"
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#include "wx/checkeddelete.h"
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// ----------------------------------------------------------------------------
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// wxScopedPtr: A scoped pointer
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// ----------------------------------------------------------------------------
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template <class T>
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class wxScopedPtr
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{
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public:
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typedef T element_type;
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wxEXPLICIT wxScopedPtr(T * ptr = NULL) : m_ptr(ptr) { }
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~wxScopedPtr() { wxCHECKED_DELETE(m_ptr); }
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// test for pointer validity: defining conversion to unspecified_bool_type
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// and not more obvious bool to avoid implicit conversions to integer types
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#ifdef __BORLANDC__
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// this compiler is too dumb to use unspecified_bool_type operator in tests
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// of the form "if ( !ptr )"
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typedef bool unspecified_bool_type;
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#else
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typedef T *(wxScopedPtr<T>::*unspecified_bool_type)() const;
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#endif // __BORLANDC__
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operator unspecified_bool_type() const
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{
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return m_ptr ? &wxScopedPtr<T>::get : NULL;
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}
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void reset(T * ptr = NULL)
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{
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if ( ptr != m_ptr )
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{
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wxCHECKED_DELETE(m_ptr);
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m_ptr = ptr;
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}
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}
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T *release()
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{
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T *ptr = m_ptr;
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m_ptr = NULL;
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return ptr;
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}
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T & operator*() const
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{
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wxASSERT(m_ptr != NULL);
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return *m_ptr;
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}
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T * operator->() const
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{
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wxASSERT(m_ptr != NULL);
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return m_ptr;
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}
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T * get() const
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{
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return m_ptr;
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}
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void swap(wxScopedPtr& other)
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{
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T * const tmp = other.m_ptr;
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other.m_ptr = m_ptr;
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m_ptr = tmp;
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}
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private:
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T * m_ptr;
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wxDECLARE_NO_COPY_TEMPLATE_CLASS(wxScopedPtr, T);
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};
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// ----------------------------------------------------------------------------
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// old macro based implementation
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// ----------------------------------------------------------------------------
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/* The type being used *must* be complete at the time
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that wxDEFINE_SCOPED_* is called or a compiler error will result.
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This is because the class checks for the completeness of the type
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being used. */
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#define wxDECLARE_SCOPED_PTR(T, name) \
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class name \
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{ \
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private: \
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T * m_ptr; \
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\
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name(name const &); \
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name & operator=(name const &); \
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\
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public: \
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wxEXPLICIT name(T * ptr = NULL) \
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: m_ptr(ptr) { } \
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\
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~name(); \
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\
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void reset(T * ptr = NULL); \
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\
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T *release() \
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{ \
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T *ptr = m_ptr; \
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m_ptr = NULL; \
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return ptr; \
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} \
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\
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T & operator*() const \
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{ \
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wxASSERT(m_ptr != NULL); \
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return *m_ptr; \
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} \
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\
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T * operator->() const \
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{ \
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wxASSERT(m_ptr != NULL); \
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return m_ptr; \
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} \
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\
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T * get() const \
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{ \
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return m_ptr; \
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} \
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\
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void swap(name & ot) \
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{ \
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T * tmp = ot.m_ptr; \
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ot.m_ptr = m_ptr; \
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m_ptr = tmp; \
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} \
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};
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#define wxDEFINE_SCOPED_PTR(T, name)\
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void name::reset(T * ptr) \
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{ \
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if (m_ptr != ptr) \
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{ \
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wxCHECKED_DELETE(m_ptr); \
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m_ptr = ptr; \
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} \
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} \
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name::~name() \
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{ \
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wxCHECKED_DELETE(m_ptr); \
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}
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// this macro can be used for the most common case when you want to declare and
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// define the scoped pointer at the same time and want to use the standard
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// naming convention: auto pointer to Foo is called FooPtr
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#define wxDEFINE_SCOPED_PTR_TYPE(T) \
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wxDECLARE_SCOPED_PTR(T, T ## Ptr) \
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wxDEFINE_SCOPED_PTR(T, T ## Ptr)
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// ----------------------------------------------------------------------------
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// "Tied" scoped pointer: same as normal one but also sets the value of
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// some other variable to the pointer value
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// ----------------------------------------------------------------------------
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#define wxDEFINE_TIED_SCOPED_PTR_TYPE(T) \
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wxDEFINE_SCOPED_PTR_TYPE(T) \
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class T ## TiedPtr : public T ## Ptr \
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{ \
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public: \
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T ## TiedPtr(T **pp, T *p) \
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: T ## Ptr(p), m_pp(pp) \
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{ \
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m_pOld = *pp; \
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*pp = p; \
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} \
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\
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~ T ## TiedPtr() \
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{ \
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*m_pp = m_pOld; \
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} \
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\
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private: \
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T **m_pp; \
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T *m_pOld; \
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};
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#endif // _WX_SCOPED_PTR_H_
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