3f66f6a5b3
This keyword is not expanded by Git which means it's not replaced with the correct revision value in the releases made using git-based scripts and it's confusing to have lines with unexpanded "$Id$" in the released files. As expanding them with Git is not that simple (it could be done with git archive and export-subst attribute) and there are not many benefits in having them in the first place, just remove all these lines. If nothing else, this will make an eventual transition to Git simpler. Closes #14487. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
140 lines
3.3 KiB
C++
140 lines
3.3 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/sharedptr.h
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// Purpose: Shared pointer based on the counted_ptr<> template, which
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// is in the public domain
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// Author: Robert Roebling, Yonat Sharon
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// Copyright: Robert Roebling
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_SHAREDPTR_H_
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#define _WX_SHAREDPTR_H_
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#include "wx/defs.h"
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#include "wx/atomic.h"
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// ----------------------------------------------------------------------------
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// wxSharedPtr: A smart pointer with non-intrusive reference counting.
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// ----------------------------------------------------------------------------
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template <class T>
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class wxSharedPtr
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{
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public:
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typedef T element_type;
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wxEXPLICIT wxSharedPtr( T* ptr = NULL )
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: m_ref(NULL)
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{
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if (ptr)
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m_ref = new reftype(ptr);
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}
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~wxSharedPtr() { Release(); }
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wxSharedPtr(const wxSharedPtr& tocopy) { Acquire(tocopy.m_ref); }
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wxSharedPtr& operator=( const wxSharedPtr& tocopy )
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{
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if (this != &tocopy)
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{
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Release();
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Acquire(tocopy.m_ref);
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}
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return *this;
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}
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wxSharedPtr& operator=( T* ptr )
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{
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if (get() != ptr)
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{
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Release();
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if (ptr)
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m_ref = new reftype(ptr);
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}
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return *this;
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}
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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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typedef T *(wxSharedPtr<T>::*unspecified_bool_type)() const;
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operator unspecified_bool_type() const
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{
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if (m_ref && m_ref->m_ptr)
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return &wxSharedPtr<T>::get;
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else
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return NULL;
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}
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T& operator*() const
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{
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wxASSERT(m_ref != NULL);
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wxASSERT(m_ref->m_ptr != NULL);
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return *(m_ref->m_ptr);
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}
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T* operator->() const
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{
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wxASSERT(m_ref != NULL);
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wxASSERT(m_ref->m_ptr != NULL);
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return m_ref->m_ptr;
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}
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T* get() const
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{
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return m_ref ? m_ref->m_ptr : NULL;
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}
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void reset( T* ptr = NULL )
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{
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Release();
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if (ptr)
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m_ref = new reftype(ptr);
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}
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bool unique() const { return (m_ref ? m_ref->m_count == 1 : true); }
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long use_count() const { return (m_ref ? (long)m_ref->m_count : 0); }
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private:
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struct reftype
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{
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reftype( T* ptr = NULL, unsigned count = 1 ) : m_ptr(ptr), m_count(count) {}
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T* m_ptr;
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wxAtomicInt m_count;
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}* m_ref;
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void Acquire(reftype* ref)
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{
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m_ref = ref;
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if (ref)
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wxAtomicInc( ref->m_count );
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}
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void Release()
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{
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if (m_ref)
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{
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if (!wxAtomicDec( m_ref->m_count ))
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{
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delete m_ref->m_ptr;
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delete m_ref;
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}
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m_ref = NULL;
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}
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}
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};
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template <class T, class U>
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bool operator == (wxSharedPtr<T> const &a, wxSharedPtr<U> const &b )
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{
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return a.get() == b.get();
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}
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template <class T, class U>
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bool operator != (wxSharedPtr<T> const &a, wxSharedPtr<U> const &b )
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{
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return a.get() != b.get();
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}
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#endif // _WX_SHAREDPTR_H_
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