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authorsimon <simon>2002-11-21 12:02:07 (UTC)
committer simon <simon>2002-11-21 12:02:07 (UTC)
commit58715bab157ca913a08b7ce26c230bbc0be5f70b (patch) (side-by-side diff)
treec104abd25c1ed2450b8fe469701e77f2e132aa2d
parent74b4b55fd5f09c1b8f38228488aa5876e40c0ae3 (diff)
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- backporting two changes from qt3:
- added QInterfacePtr template class to take over the tedious work of manual refcounting on interface objects - the QREFCOUNT macro no longer relies on the developer to declare (and initialize!) a refcnt variable but defines a qtrefcount class variable itself, that takes care of proper initialization (fixes various missing refcounter initializations found) Harlekin suggested to commit :)
Diffstat (more/less context) (ignore whitespace changes)
-rw-r--r--library/qcom.h90
1 files changed, 89 insertions, 1 deletions
diff --git a/library/qcom.h b/library/qcom.h
index 8c0fa60..9972d8f 100644
--- a/library/qcom.h
+++ b/library/qcom.h
@@ -22,62 +22,150 @@
#define QCOM_H
#include <qstringlist.h>
#ifndef QT_NO_COMPONENT
#include <qpe/quuid.h>
#define QRESULT unsigned long
#define QS_OK (QRESULT)0x00000000
#define QS_FALSE (QRESULT)0x00000001
#define QE_NOTIMPL (QRESULT)0x80000001
#define QE_OUTOFMEMORY (QRESULT)0x80000002
#define QE_INVALIDARG (QRESULT)0x80000003
#define QE_NOINTERFACE (QRESULT)0x80000004
#define QE_NOCOMPONENT (QRESULT)0x80000005
// {1D8518CD-E8F5-4366-99E8-879FD7E482DE}
#ifndef IID_QUnknown
#define IID_QUnknown QUuid(0x1d8518cd, 0xe8f5, 0x4366, 0x99, 0xe8, 0x87, 0x9f, 0xd7, 0xe4, 0x82, 0xde)
#endif
struct Q_EXPORT QUnknownInterface
{
virtual QRESULT queryInterface( const QUuid&, QUnknownInterface** ) = 0;
virtual ulong addRef() = 0;
virtual ulong release() = 0;
};
// {D16111D4-E1E7-4C47-8599-24483DAE2E07}
#ifndef IID_QLibrary
#define IID_QLibrary QUuid( 0xd16111d4, 0xe1e7, 0x4c47, 0x85, 0x99, 0x24, 0x48, 0x3d, 0xae, 0x2e, 0x07)
#endif
struct Q_EXPORT QLibraryInterface : public QUnknownInterface
{
virtual bool init() = 0;
virtual void cleanup() = 0;
virtual bool canUnload() const = 0;
};
#define Q_CREATE_INSTANCE( IMPLEMENTATION ) \
IMPLEMENTATION *i = new IMPLEMENTATION; \
QUnknownInterface* iface = 0; \
i->queryInterface( IID_QUnknown, &iface ); \
return iface;
+template <class T>
+class QInterfacePtr
+{
+public:
+ QInterfacePtr():iface(0){}
+
+ QInterfacePtr( T* i) {
+ if ( (iface = i) )
+ iface->addRef();
+ }
+
+ QInterfacePtr(const QInterfacePtr<T> &p) {
+ if ( (iface = p.iface) )
+ iface->addRef();
+ }
+
+ ~QInterfacePtr() {
+ if ( iface )
+ iface->release();
+ }
+
+ QInterfacePtr<T> &operator=(const QInterfacePtr<T> &p) {
+ if ( iface != p.iface ) {
+ if ( iface )
+ iface->release();
+ if ( (iface = p.iface) )
+ iface->addRef();
+ }
+ return *this;
+ }
+
+ QInterfacePtr<T> &operator=(T* i) {
+ if (iface != i ) {
+ if ( iface )
+ iface->release();
+ if ( (iface = i) )
+ iface->addRef();
+ }
+ return *this;
+ }
+
+ bool operator==( const QInterfacePtr<T> &p ) const { return iface == p.iface; }
+
+ bool operator!= ( const QInterfacePtr<T>& p ) const { return !( *this == p ); }
+
+ bool isNull() const { return !iface; }
+
+ T* operator->() const { return iface; }
+
+ T& operator*() const { return *iface; }
+
+ operator T*() const { return iface; }
+
+ QUnknownInterface** operator &() const {
+ if( iface )
+ iface->release();
+ return (QUnknownInterface**)&iface;
+ }
+
+ T** operator &() {
+ if ( iface )
+ iface->release();
+ return &iface;
+ }
+
+private:
+ T* iface;
+};
+
+
+// internal class that wraps an initialized ulong
+struct Q_EXPORT QtULong
+{
+ QtULong() : ref( 0 ) { }
+ operator unsigned long () const { return ref; }
+ unsigned long& operator++() { return ++ref; }
+ unsigned long operator++( int ) { return ref++; }
+ unsigned long& operator--() { return --ref; }
+ unsigned long operator--( int ) { return ref--; }
+
+ unsigned long ref;
+};
+
#define Q_EXPORT_INTERFACE() \
extern "C" QUnknownInterface* ucm_instantiate()
-#define Q_REFCOUNT ulong addRef() {return ref++;}ulong release() {if(!--ref){delete this;return 0;}return ref;}
+#define Q_REFCOUNT \
+private: \
+ QtULong qtrefcount; \
+public: \
+ ulong addRef() {return qtrefcount++;} \
+ ulong release() {if(!--qtrefcount){delete this;return 0;}return qtrefcount;}
#else // QT_NO_COMPONENT
struct Q_EXPORT QUnknownInterface
{
};
#endif // QT_NO_COMPONENT
#endif // QCOM_H