QskMetaInvokable introduced

playground/invoker/Invoker.cpp

@@ -32,7 +32,7 @@ void Invoker::invoke( qreal realValue, int intValue,
     {
         void* args[4] = { nullptr };
 
-        const auto types = callback.parameterTypes();
+        const auto types = callback.invokable().parameterTypes();
 
         int i = 1;
         for ( auto type : types )

src/common/QskMetaCallback.cpp

@@ -4,41 +4,12 @@
  *****************************************************************************/
 
 #include "QskMetaCallback.h"
-#include "QskMetaFunction.h"
 #include "QskMetaMethod.h"
 
-#include <QMetaMethod>
-
-namespace
-{
-    class Function: public QskMetaFunction
-    {
-    public:
-        inline Function( void* functionCall ):
-            QskMetaFunction( static_cast< FunctionCall* >( functionCall ) )
-        {
-        }
-
-        static inline void ref( void* functionCall )
-        {
-            if ( functionCall )
-                static_cast< FunctionCall* >( functionCall )->ref();
-        }
-
-        static inline void deref( void* functionCall )
-        {
-            if ( functionCall )
-                static_cast< FunctionCall* >( functionCall )->destroyIfLastRef();
-        }
-    };
-}
-
-
 QskMetaCallback::QskMetaCallback( const QObject* object,
         const QMetaMethod& method, Qt::ConnectionType connectionType ):
     m_object( const_cast< QObject* >( object ) ),
-    m_methodData { method.enclosingMetaObject(), method.methodIndex()  },
-    m_type( MetaMethod ),
+    m_invokable( method ),
     m_hasObject( object != nullptr ),
     m_connectionType( static_cast< ushort >( connectionType & 0x3 ) )
 {
@@ -53,88 +24,14 @@ QskMetaCallback::QskMetaCallback( const QObject* object,
 QskMetaCallback::QskMetaCallback( const QObject* object,
         const QskMetaFunction& function, Qt::ConnectionType connectionType ):
     m_object( const_cast< QObject* >( object ) ),
-    m_functionData { function.functionCall(), function.parameterTypes() },
-    m_type( MetaFunction ),
+    m_invokable( function ),
     m_hasObject( object != nullptr ),
     m_connectionType( static_cast< ushort >( connectionType & ~Qt::UniqueConnection ) )
 {
-    Function::ref( m_functionData.functionCall );
-}
-
-QskMetaCallback::QskMetaCallback( const QskMetaCallback& other ):
-    m_object( other.m_object ),
-    m_type( other.m_type ),
-    m_hasObject( other.m_hasObject ),
-    m_connectionType( other.m_connectionType )
-{
-    switch( m_type )
-    {
-        case MetaMethod:
-        {
-            m_methodData.metaObject = other.m_methodData.metaObject;
-            m_methodData.methodIndex = other.m_methodData.methodIndex;
-
-            break;
-        }
-        case MetaFunction:
-        {
-            m_functionData.functionCall = other.m_functionData.functionCall;
-            Function::ref( m_functionData.functionCall );
-
-            m_functionData.parameterTypes = other.m_functionData.parameterTypes;
-            break;
-        }
-
-        default:
-            break;
-    }
 }
 
 QskMetaCallback::~QskMetaCallback()
 {
-    if ( m_type == MetaFunction )
-        Function::deref( m_functionData.functionCall );
-}
-
-QskMetaCallback& QskMetaCallback::operator=( const QskMetaCallback& other )
-{
-    m_object = other.m_object;
-    m_hasObject = other.m_hasObject;
-
-    m_connectionType = other.m_connectionType;
-
-    switch( other.m_type )
-    {
-        case MetaMethod:
-        {
-            if ( m_type == MetaFunction )
-                Function::deref( m_functionData.functionCall );
-
-            m_methodData.metaObject = other.m_methodData.metaObject;
-            m_methodData.methodIndex = other.m_methodData.methodIndex;
-
-            break;
-        }
-        case MetaFunction:
-        {
-            if ( m_type == MetaFunction  )
-                Function::deref( m_functionData.functionCall );
-
-            m_functionData.functionCall = other.m_functionData.functionCall;
-            Function::ref( m_functionData.functionCall );
-
-            m_functionData.parameterTypes = other.m_functionData.parameterTypes;
-            break;
-        }
-
-        default:
-            if ( m_type == MetaFunction )
-                Function::deref( m_functionData.functionCall );
-    }
-
-    m_type = other.m_type;
-
-    return *this;
 }
 
 bool QskMetaCallback::isValid() const
@@ -142,28 +39,13 @@ bool QskMetaCallback::isValid() const
     if ( m_hasObject && m_object.isNull() )
         return false;
 
-    switch( m_type )
-    {
-        case MetaMethod:
-        {
-            const auto& d = m_methodData;
-            if ( d.metaObject && ( d.methodIndex >= 0 )
-                && ( d.methodIndex < d.metaObject->methodCount() ) )
-            {
-                return true;
-            }
+    return !m_invokable.isNull();
+}
 
-            return false;
-        }
-
-        case MetaFunction:
-        {
-            return m_functionData.functionCall != nullptr;
-        }
-
-        default:
-            return false;
-    }
+void QskMetaCallback::setInvokable( const QskMetaInvokable& invokable )
+{
+    // type checking is m_object matches ???
+    m_invokable = invokable;
 }
 
 void QskMetaCallback::setConnectionType( Qt::ConnectionType connectionType )
@@ -171,88 +53,8 @@ void QskMetaCallback::setConnectionType( Qt::ConnectionType connectionType )
     m_connectionType = connectionType;
 }
 
-void QskMetaCallback::reset()
-{
-    m_object = nullptr;
-    m_hasObject = false;
-
-    if ( m_type == MetaFunction )
-        Function::deref( m_functionData.functionCall );
-
-    m_functionData = { nullptr, nullptr }; // for the debugger
-    m_type = Invalid;
-}
-
-QVector< int > QskMetaCallback::parameterTypes() const
-{
-    QVector< int > paramTypes;
-
-    switch( m_type )
-    {
-        case MetaMethod:
-        {
-            const auto& d = m_methodData;
-            if ( m_methodData.metaObject )
-            {
-#if 1
-                // should be doable without QMetaMethod. TODO ...
-                const auto method = d.metaObject->method( d.methodIndex );
-#endif
-                const int paramCount = method.parameterCount();
-
-                paramTypes.reserve( paramCount );
-                for ( int i = 0; i < paramCount; i++ )
-                    paramTypes += method.parameterType( i );
-            }
-
-            break;
-        }
-        case MetaFunction:
-        {
-            auto types = m_functionData.parameterTypes;
-            if ( types )
-            {
-                while ( *types )
-                    paramTypes += *types++;
-            }
-            break;
-        }
-        default:
-            break;
-    }
-
-    return paramTypes;
-}
-
-
 void QskMetaCallback::invoke( void* args[] )
 {
-    if ( !isValid() )
-        return;
-
-    auto object = const_cast< QObject* >( m_object.data() );
-
-    switch( m_type )
-    {
-        case MetaMethod:
-        {
-            QskMetaMethod::invoke( object, m_methodData.metaObject,
-                m_methodData.methodIndex, args, connectionType() );
-
-            break;
-        }
-        case MetaFunction:
-        {
-            if ( m_functionData.functionCall )
-            {
-                Function function( m_functionData.functionCall );
-                function.invoke( object, args, connectionType() );
-            }
-
-            break;
-        }
-
-        default:
-            break;
-    }
+    if ( isValid() )
+        m_invokable.invoke( m_object, args, connectionType() );
 }

src/common/QskMetaCallback.h

@@ -7,29 +7,14 @@
 #define QSK_META_CALLBACK_H 1
 
 #include "QskGlobal.h"
+#include "QskMetaInvokable.h"
 
 #include <QPointer>
-#include <QVector>
 #include <QObject>
 
-class QskMetaFunction;
-class QMetaObject;
-class QMetaMethod;
-
 class QSK_EXPORT QskMetaCallback
 {
 public:
-    enum Type
-    {
-        Invalid = 0,
-
-        // A QMetaMethod
-        MetaMethod,
-
-        // A function pointer, for what Qt calls "functor based" callbacks
-        MetaFunction
-    };
-
     QskMetaCallback();
 
     QskMetaCallback( const QObject*, const QskMetaFunction&,
@@ -41,61 +26,42 @@ public:
     QskMetaCallback( const QObject*, const char* methodName,
         Qt::ConnectionType = Qt::AutoConnection );
 
-    QskMetaCallback( const QskMetaCallback& );
-
     ~QskMetaCallback();
 
-    QskMetaCallback& operator=( const QskMetaCallback& );
-
-    Type type() const;
     bool isValid() const;
+    bool isStale() const;
 
     const QObject* object() const { return m_object; }
 
+    void setInvokable( const QskMetaInvokable& );
+    const QskMetaInvokable& invokable() const;
+
     void setConnectionType( Qt::ConnectionType );
     Qt::ConnectionType connectionType() const;
 
-    QVector< int > parameterTypes() const;
-
     void invoke( void* args[] );
 
 private:
-    void reset();
+    QPointer< QObject > m_object;
+    QskMetaInvokable m_invokable;
 
-    QPointer< const QObject > m_object;
-
-    struct FunctionData
-    {
-        void* functionCall;
-        const int* parameterTypes;
-    };
-
-    struct MethodData
-    {
-        const QMetaObject* metaObject;
-        int methodIndex;
-    };
-
-    union
-    {
-        FunctionData m_functionData;
-        MethodData m_methodData;
-    };
-
-    int m_type : 3;
     bool m_hasObject : 1;
     ushort m_connectionType : 3;
 };
 
 inline QskMetaCallback::QskMetaCallback():
-    m_type( Invalid ),
     m_hasObject( false )
 {
 }
 
-inline QskMetaCallback::Type QskMetaCallback::type() const
+inline bool QskMetaCallback::isStale() const
 {
-    return static_cast< Type >( m_type );
+    return m_hasObject && m_object.isNull();
+}
+
+inline const QskMetaInvokable& QskMetaCallback::invokable() const
+{
+    return m_invokable;
 }
 
 inline Qt::ConnectionType QskMetaCallback::connectionType() const

src/common/QskMetaFunction.cpp

@@ -123,6 +123,34 @@ QskMetaFunction& QskMetaFunction::operator=( const QskMetaFunction& other )
     return *this;
 }
 
+bool QskMetaFunction::operator==( const QskMetaFunction& other ) const
+{
+    if ( m_functionCall == other.m_functionCall )
+        return true;
+
+    /*
+        There is no way to compmare functors/members without
+        std::type_info, what we don't want to use as it is
+        another template creating symbols.
+
+        So this implementation can't do much more than finding
+        out if one instance is a copy from another.
+     */
+
+    if ( m_functionCall && other.m_functionCall )
+    {
+        if ( m_functionCall->typeInfo() == Function &&
+             other.m_functionCall->typeInfo() == Function )
+        {
+            // only static functions can be compared
+            return m_functionCall->compare(
+                reinterpret_cast< void** >( other.m_functionCall ) );
+        }
+    }
+
+    return false;
+}
+
 size_t QskMetaFunction::parameterCount() const
 {
     if ( auto types = parameterTypes() )

src/common/QskMetaFunction.h

@@ -70,6 +70,11 @@ public:
     QskMetaFunction& operator=( const QskMetaFunction& );
     QskMetaFunction& operator=( QskMetaFunction&& );
 
+    bool operator==( const QskMetaFunction& ) const;
+    bool operator!=( const QskMetaFunction& ) const;
+
+    explicit operator bool() const;
+
     const int* parameterTypes() const;
 
     // including the return type !
@@ -79,6 +84,7 @@ public:
         Qt::ConnectionType = Qt::AutoConnection );
 
     Type functionType() const;
+    bool isNull() const;
 
     class FunctionCall;
     FunctionCall* functionCall() const;
@@ -90,13 +96,28 @@ private:
     FunctionCall* m_functionCall;
 };
 
-#include "QskMetaFunction.hpp"
+inline bool QskMetaFunction::operator!=( const QskMetaFunction& other ) const
+{
+    return !( *this == other );
+}
+
+inline QskMetaFunction::operator bool() const
+{
+    return !isNull();
+}
+
+inline bool QskMetaFunction::isNull() const
+{
+    return m_functionCall == nullptr;
+}
 
 inline QskMetaFunction::FunctionCall* QskMetaFunction::functionCall() const
 {
     return m_functionCall;
 }
 
+#include "QskMetaFunction.hpp"
+
 inline const int* QskMetaFunction::parameterTypes() const
 {
     return m_functionCall ? m_functionCall->parameterTypes() : nullptr;

src/common/QskMetaFunction.hpp

@@ -63,7 +63,7 @@ namespace QskMetaFunctionCall
         }
 
         static void invoke(int which, QSlotObjectBase* functionCall,
-            QObject* object, void** args, bool* )
+            QObject* object, void** args, bool* ret )
         {
             switch ( which )
             {
@@ -80,6 +80,13 @@ namespace QskMetaFunctionCall
                         static_cast< MetaCall* >( functionCall )->m_function, object, args );
                     break;
                 }
+                case Compare:
+                {
+                    *ret = reinterpret_cast< MetaCall* >( args )->m_function
+                        == static_cast< MetaCall* >( functionCall )->m_function;
+
+                    break;
+                }
                 case TypeInfo:
                 {
                     *reinterpret_cast< int* >( args ) = QskMetaFunction::Function;
@@ -148,14 +155,14 @@ namespace QskMetaFunctionCall
         {
         }
 
-        static void invoke( int which, QSlotObjectBase* slotObject,
+        static void invoke( int which, QSlotObjectBase* functionCall,
             QObject* object, void** args, bool* )
         {
             switch (which)
             {
                 case Destroy:
                 {
-                    delete static_cast< MetaCall* >( slotObject );
+                    delete static_cast< MetaCall* >( functionCall );
                     break;
                 }
                 case Call:
@@ -163,7 +170,7 @@ namespace QskMetaFunctionCall
                     typedef Functor< Function, N > FuncType;
 
                     FuncType::template call< Args, R >(
-                        static_cast< MetaCall* >( slotObject )->m_function, object, args );
+                        static_cast< MetaCall* >( functionCall )->m_function, object, args );
 
                     break;
                 }

src/common/QskMetaInvokable.cpp

@@ -0,0 +1,251 @@
+/******************************************************************************
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
+ *****************************************************************************/
+
+#include "QskMetaInvokable.h"
+#include "QskMetaFunction.h"
+#include "QskMetaMethod.h"
+
+#include <QMetaMethod>
+#include <QVector>
+#include <QObject>
+
+namespace
+{
+    class Function : public QskMetaFunction
+    {
+    public:
+        inline Function( void* functionCall ):
+            QskMetaFunction( static_cast< FunctionCall* >( functionCall ) )
+        {
+        }
+
+        static inline void ref( void* functionCall )
+        {
+            if ( functionCall )
+                static_cast< FunctionCall* >( functionCall )->ref();
+        }
+
+        static inline void deref( void* functionCall )
+        {
+            if ( functionCall )
+                static_cast< FunctionCall* >( functionCall )->destroyIfLastRef();
+        }
+    };
+}
+
+
+QskMetaInvokable::QskMetaInvokable( const QMetaMethod& method ):
+    m_methodData { method.enclosingMetaObject(), method.methodIndex()  },
+    m_type( MetaMethod )
+{
+}
+
+QskMetaInvokable::QskMetaInvokable( const QObject* object, const char* methodName ):
+    QskMetaInvokable( QskMetaMethod::method( object, methodName ) )
+{
+}
+
+QskMetaInvokable::QskMetaInvokable( const QMetaObject* metaObject, const char* methodName ):
+    QskMetaInvokable( QskMetaMethod::method( metaObject, methodName ) )
+{
+}
+
+QskMetaInvokable::QskMetaInvokable( const QskMetaFunction& function ):
+    m_functionData { function.functionCall() },
+    m_type( MetaFunction )
+{
+    Function::ref( m_functionData.functionCall );
+}
+
+QskMetaInvokable::QskMetaInvokable( const QskMetaInvokable& other ):
+    m_type( other.m_type )
+{
+    switch( m_type )
+    {
+        case MetaMethod:
+        {
+            m_methodData.metaObject = other.m_methodData.metaObject;
+            m_methodData.methodIndex = other.m_methodData.methodIndex;
+
+            break;
+        }
+        case MetaFunction:
+        {
+            m_functionData.functionCall = other.m_functionData.functionCall;
+            Function::ref( m_functionData.functionCall );
+
+            break;
+        }
+
+        default:
+            break;
+    }
+}
+
+QskMetaInvokable::~QskMetaInvokable()
+{
+    if ( m_type == MetaFunction )
+        Function::deref( m_functionData.functionCall );
+}
+
+QskMetaInvokable& QskMetaInvokable::operator=( const QskMetaInvokable& other )
+{
+    switch( other.m_type )
+    {
+        case MetaMethod:
+        {
+            if ( m_type == MetaFunction )
+                Function::deref( m_functionData.functionCall );
+
+            m_methodData.metaObject = other.m_methodData.metaObject;
+            m_methodData.methodIndex = other.m_methodData.methodIndex;
+
+            break;
+        }
+        case MetaFunction:
+        {
+            if ( m_type == MetaFunction  )
+                Function::deref( m_functionData.functionCall );
+
+            m_functionData.functionCall = other.m_functionData.functionCall;
+            Function::ref( m_functionData.functionCall );
+
+            break;
+        }
+
+        default:
+            if ( m_type == MetaFunction )
+                Function::deref( m_functionData.functionCall );
+    }
+
+    m_type = other.m_type;
+
+    return *this;
+}
+
+bool QskMetaInvokable::operator==( const QskMetaInvokable& other ) const
+{
+    if ( m_type == other.m_type )
+    {
+        if ( m_type == MetaMethod )
+        {
+            return ( m_methodData.metaObject == other.m_methodData.metaObject )
+                && ( m_methodData.methodIndex == other.m_methodData.methodIndex );
+        }
+        if ( m_type == MetaFunction )
+        {
+            return m_functionData.functionCall == other.m_functionData.functionCall;
+        }
+    }
+
+    return true;
+}
+
+bool QskMetaInvokable::isNull() const
+{
+    switch( m_type )
+    {
+        case MetaMethod:
+        {
+            const auto& d = m_methodData;
+            if ( d.metaObject && ( d.methodIndex >= 0 )
+                && ( d.methodIndex < d.metaObject->methodCount() ) )
+            {
+                return false;
+            }
+
+            return true;
+        }
+
+        case MetaFunction:
+        {
+            return m_functionData.functionCall == nullptr;
+        }
+
+        default:
+            return true;
+    }
+}
+
+void QskMetaInvokable::reset()
+{
+    if ( m_type == MetaFunction )
+        Function::deref( m_functionData.functionCall );
+
+    m_type = Invalid;
+}
+
+QVector< int > QskMetaInvokable::parameterTypes() const
+{
+    QVector< int > paramTypes;
+
+    switch( m_type )
+    {
+        case MetaMethod:
+        {
+            const auto& d = m_methodData;
+            if ( m_methodData.metaObject )
+            {
+#if 1
+                // should be doable without QMetaMethod. TODO ...
+                const auto method = d.metaObject->method( d.methodIndex );
+#endif
+                const int paramCount = method.parameterCount();
+
+                paramTypes.reserve( paramCount );
+                for ( int i = 0; i < paramCount; i++ )
+                    paramTypes += method.parameterType( i );
+            }
+
+            break;
+        }
+        case MetaFunction:
+        {
+            auto types = Function( m_functionData.functionCall ).parameterTypes();
+            if ( types )
+            {
+                while ( *types )
+                    paramTypes += *types++;
+            }
+            break;
+        }
+        default:
+            break;
+    }
+
+    return paramTypes;
+}
+
+
+void QskMetaInvokable::invoke( QObject* object, void* args[],
+    Qt::ConnectionType connectionType )
+{
+    if ( isNull() )
+        return;
+
+    switch( m_type )
+    {
+        case MetaMethod:
+        {
+            QskMetaMethod::invoke( object, m_methodData.metaObject,
+                m_methodData.methodIndex, args, connectionType );
+
+            break;
+        }
+        case MetaFunction:
+        {
+            if ( m_functionData.functionCall )
+            {
+                Function function( m_functionData.functionCall );
+                function.invoke( object, args, connectionType );
+            }
+
+            break;
+        }
+
+        default:
+            break;
+    }
+}

src/common/QskMetaInvokable.h

@@ -0,0 +1,106 @@
+/******************************************************************************
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QSK_META_INVOKABLE_H
+#define QSK_META_INVOKABLE_H 1
+
+#include "QskGlobal.h"
+
+#include <QMetaType>
+#include <Qt>
+
+template< typename T > class QVector;
+
+class QskMetaFunction;
+class QMetaObject;
+class QMetaMethod;
+class QObject;
+
+class QSK_EXPORT QskMetaInvokable
+{
+public:
+    enum Type
+    {
+        Invalid = 0,
+
+        // A QMetaMethod
+        MetaMethod,
+
+        // A function pointer, for what Qt calls "functor based" callbacks
+        MetaFunction
+    };
+
+    QskMetaInvokable();
+
+    QskMetaInvokable( const QskMetaFunction& );
+    QskMetaInvokable( const QMetaMethod& );
+    QskMetaInvokable( const QObject*, const char* methodName );
+    QskMetaInvokable( const QMetaObject*, const char* methodName );
+
+    QskMetaInvokable( const QskMetaInvokable& );
+
+    ~QskMetaInvokable();
+
+    QskMetaInvokable& operator=( const QskMetaInvokable& );
+
+    bool operator==( const QskMetaInvokable& ) const;
+    bool operator!=( const QskMetaInvokable& ) const;
+
+    explicit operator bool() const;
+
+    Type type() const;
+    bool isNull() const;
+
+    QVector< int > parameterTypes() const;
+
+    void invoke( QObject*, void* args[],
+        Qt::ConnectionType = Qt::AutoConnection );
+
+    void reset();
+
+private:
+    struct FunctionData
+    {
+        void* functionCall;
+    };
+
+    struct MethodData
+    {
+        const QMetaObject* metaObject;
+        int methodIndex;
+    };
+
+    union
+    {
+        FunctionData m_functionData;
+        MethodData m_methodData;
+    };
+
+    int m_type : 3;
+};
+
+inline QskMetaInvokable::QskMetaInvokable():
+    m_type( Invalid )
+{
+}
+
+inline bool QskMetaInvokable::operator!=( const QskMetaInvokable& other ) const
+{
+    return !( *this == other );
+}
+
+inline QskMetaInvokable::operator bool() const
+{
+    return !isNull();
+}
+
+inline QskMetaInvokable::Type QskMetaInvokable::type() const
+{
+    return static_cast< Type >( m_type );
+}
+
+Q_DECLARE_METATYPE( QskMetaInvokable )
+
+#endif

src/src.pro

@@ -43,6 +43,7 @@ HEADERS += \
     common/QskMetaCallback.h \
     common/QskMetaFunction.h \
     common/QskMetaFunction.hpp \
+    common/QskMetaInvokable.h \
     common/QskMetaMethod.h \
     common/QskModule.h \
     common/QskNamespace.h \
@@ -62,6 +63,7 @@ SOURCES += \
     common/QskMargins.cpp \
     common/QskMetaCallback.cpp \
     common/QskMetaFunction.cpp \
+    common/QskMetaInvokable.cpp \
     common/QskMetaMethod.cpp \
     common/QskModule.cpp \
     common/QskObjectCounter.cpp \