fastdelegate.h.svn-base

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// Implicit conversion to "bool" is achieved using the safe_bool idiom,
// using member data pointers (MDP). This allows "if (dg)..." syntax
// Because some compilers (eg codeplay) don't have a unique value for a zero
// MDP, an extra padding member is added to the SafeBool struct.
// Some compilers (eg VC6) won't implicitly convert from 0 to an MDP, so
// in that case the static function constructor is not made explicit; this
// allows "if (dg==0) ..." to compile.

//N=0
template<class RetType=detail::DefaultVoid>
class FastDelegate0 {
private:
	typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
	typedef DesiredRetType (*StaticFunctionPtr)();
	typedef RetType (*UnvoidStaticFunctionPtr)();
	typedef RetType (detail::GenericClass::*GenericMemFn)();
	typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
	ClosureType m_Closure;
public:
	// Typedefs to aid generic programming
	typedef FastDelegate0 type;

	// Construction and comparison functions
	FastDelegate0() { clear(); }
	FastDelegate0(const FastDelegate0 &x) {
		m_Closure.CopyFrom(this, x.m_Closure); }
	void operator = (const FastDelegate0 &x)  {
		m_Closure.CopyFrom(this, x.m_Closure); }
	bool operator ==(const FastDelegate0 &x) const {
		return m_Closure.IsEqual(x.m_Closure);	}
	bool operator !=(const FastDelegate0 &x) const {
		return !m_Closure.IsEqual(x.m_Closure); }
	bool operator <(const FastDelegate0 &x) const {
		return m_Closure.IsLess(x.m_Closure);	}
	bool operator >(const FastDelegate0 &x) const {
		return x.m_Closure.IsLess(m_Closure);	}
	// Binding to non-const member functions
	template < class X, class Y >
	FastDelegate0(Y *pthis, DesiredRetType (X::* function_to_bind)() ) {
		m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
	template < class X, class Y >
	inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)()) {
		m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind);	}
	// Binding to const member functions.
	template < class X, class Y >
	FastDelegate0(const Y *pthis, DesiredRetType (X::* function_to_bind)() const) {
		m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind);	}
	template < class X, class Y >
	inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)() const) {
		m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind);	}
	// Static functions. We convert them into a member function call.
	// This constructor also provides implicit conversion
	FastDelegate0(DesiredRetType (*function_to_bind)() ) {
		bind(function_to_bind);	}
	// for efficiency, prevent creation of a temporary
	void operator = (DesiredRetType (*function_to_bind)() ) {
		bind(function_to_bind);	}
	inline void bind(DesiredRetType (*function_to_bind)()) {
		m_Closure.bindstaticfunc(this, &FastDelegate0::InvokeStaticFunction, 
			function_to_bind); }
	// Invoke the delegate
	RetType operator() () const {
	return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(); }
	// Implicit conversion to "bool" using the safe_bool idiom
private:
	typedef struct SafeBoolStruct {
		int a_data_pointer_to_this_is_0_on_buggy_compilers;
		StaticFunctionPtr m_nonzero;
	} UselessTypedef;
    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
public:
	operator unspecified_bool_type() const {
        return empty()? 0: &SafeBoolStruct::m_nonzero;
    }
	// necessary to allow ==0 to work despite the safe_bool idiom
	inline bool operator==(StaticFunctionPtr funcptr) {
		return m_Closure.IsEqualToStaticFuncPtr(funcptr);	}
	inline bool operator!=(StaticFunctionPtr funcptr) { 
		return !m_Closure.IsEqualToStaticFuncPtr(funcptr);    }
	inline bool operator ! () const	{	// Is it bound to anything?
			return !m_Closure; }
	inline bool empty() const	{
			return !m_Closure; }
	void clear() { m_Closure.clear();}
	// Conversion to and from the DelegateMemento storage class
	const DelegateMemento & GetMemento() { return m_Closure; }
	void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }

private:	// Invoker for static functions
	RetType InvokeStaticFunction() const {
	return (*(m_Closure.GetStaticFunction()))(); }
};

//N=1
template<class Param1, class RetType=detail::DefaultVoid>
class FastDelegate1 {
private:
	typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
	typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1);
	typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1);
	typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1);
	typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
	ClosureType m_Closure;
public:
	// Typedefs to aid generic programming
	typedef FastDelegate1 type;

	// Construction and comparison functions
	FastDelegate1() { clear(); }
	FastDelegate1(const FastDelegate1 &x) {
		m_Closure.CopyFrom(this, x.m_Closure); }
	void operator = (const FastDelegate1 &x)  {
		m_Closure.CopyFrom(this, x.m_Closure); }
	bool operator ==(const FastDelegate1 &x) const {
		return m_Closure.IsEqual(x.m_Closure);	}
	bool operator !=(const FastDelegate1 &x) const {
		return !m_Closure.IsEqual(x.m_Closure); }
	bool operator <(const FastDelegate1 &x) const {
		return m_Closure.IsLess(x.m_Closure);	}
	bool operator >(const FastDelegate1 &x) const {
		return x.m_Closure.IsLess(m_Closure);	}
	// Binding to non-const member functions
	template < class X, class Y >
	FastDelegate1(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1) ) {
		m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
	template < class X, class Y >
	inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1)) {
		m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind);	}
	// Binding to const member functions.
	template < class X, class Y >
	FastDelegate1(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1) const) {
		m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind);	}
	template < class X, class Y >
	inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1) const) {
		m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind);	}
	// Static functions. We convert them into a member function call.
	// This constructor also provides implicit conversion
	FastDelegate1(DesiredRetType (*function_to_bind)(Param1 p1) ) {
		bind(function_to_bind);	}
	// for efficiency, prevent creation of a temporary
	void operator = (DesiredRetType (*function_to_bind)(Param1 p1) ) {
		bind(function_to_bind);	}
	inline void bind(DesiredRetType (*function_to_bind)(Param1 p1)) {
		m_Closure.bindstaticfunc(this, &FastDelegate1::InvokeStaticFunction, 
			function_to_bind); }
	// Invoke the delegate
	RetType operator() (Param1 p1) const {
	return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1); }
	// Implicit conversion to "bool" using the safe_bool idiom
private:
	typedef struct SafeBoolStruct {
		int a_data_pointer_to_this_is_0_on_buggy_compilers;
		StaticFunctionPtr m_nonzero;
	} UselessTypedef;
    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
public:
	operator unspecified_bool_type() const {
        return empty()? 0: &SafeBoolStruct::m_nonzero;
    }
	// necessary to allow ==0 to work despite the safe_bool idiom
	inline bool operator==(StaticFunctionPtr funcptr) {
		return m_Closure.IsEqualToStaticFuncPtr(funcptr);	}
	inline bool operator!=(StaticFunctionPtr funcptr) { 
		return !m_Closure.IsEqualToStaticFuncPtr(funcptr);    }
	inline bool operator ! () const	{	// Is it bound to anything?
			return !m_Closure; }
	inline bool empty() const	{
			return !m_Closure; }
	void clear() { m_Closure.clear();}
	// Conversion to and from the DelegateMemento storage class
	const DelegateMemento & GetMemento() { return m_Closure; }
	void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }

private:	// Invoker for static functions
	RetType InvokeStaticFunction(Param1 p1) const {
	return (*(m_Closure.GetStaticFunction()))(p1); }
};

//N=2
template<class Param1, class Param2, class RetType=detail::DefaultVoid>
class FastDelegate2 {
private:
	typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
	typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2);
	typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2);
	typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2);
	typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
	ClosureType m_Closure;
public:
	// Typedefs to aid generic programming
	typedef FastDelegate2 type;

	// Construction and comparison functions
	FastDelegate2() { clear(); }
	FastDelegate2(const FastDelegate2 &x) {
		m_Closure.CopyFrom(this, x.m_Closure); }
	void operator = (const FastDelegate2 &x)  {
		m_Closure.CopyFrom(this, x.m_Closure); }
	bool operator ==(const FastDelegate2 &x) const {
		return m_Closure.IsEqual(x.m_Closure);	}
	bool operator !=(const FastDelegate2 &x) const {
		return !m_Closure.IsEqual(x.m_Closure); }
	bool operator <(const FastDelegate2 &x) const {
		return m_Closure.IsLess(x.m_Closure);	}
	bool operator >(const FastDelegate2 &x) const {
		return x.m_Closure.IsLess(m_Closure);	}
	// Binding to non-const member functions
	template < class X, class Y >
	FastDelegate2(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2) ) {
		m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
	template < class X, class Y >
	inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2)) {
		m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind);	}
	// Binding to const member functions.
	template < class X, class Y >
	FastDelegate2(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2) const) {
		m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind);	}
	template < class X, class Y >
	inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2) const) {
		m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind);	}
	// Static functions. We convert them into a member function call.
	// This constructor also provides implicit conversion
	FastDelegate2(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2) ) {
		bind(function_to_bind);	}
	// for efficiency, prevent creation of a temporary
	void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2) ) {
		bind(function_to_bind);	}
	inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2)) {
		m_Closure.bindstaticfunc(this, &FastDelegate2::InvokeStaticFunction, 
			function_to_bind); }
	// Invoke the delegate
	RetType operator() (Param1 p1, Param2 p2) const {
	return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2); }
	// Implicit conversion to "bool" using the safe_bool idiom
private:
	typedef struct SafeBoolStruct {
		int a_data_pointer_to_this_is_0_on_buggy_compilers;
		StaticFunctionPtr m_nonzero;
	} UselessTypedef;
    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
public:
	operator unspecified_bool_type() const {
        return empty()? 0: &SafeBoolStruct::m_nonzero;
    }
	// necessary to allow ==0 to work despite the safe_bool idiom
	inline bool operator==(StaticFunctionPtr funcptr) {
		return m_Closure.IsEqualToStaticFuncPtr(funcptr);	}
	inline bool operator!=(StaticFunctionPtr funcptr) { 
		return !m_Closure.IsEqualToStaticFuncPtr(funcptr);    }
	inline bool operator ! () const	{	// Is it bound to anything?
			return !m_Closure; }
	inline bool empty() const	{
			return !m_Closure; }
	void clear() { m_Closure.clear();}
	// Conversion to and from the DelegateMemento storage class
	const DelegateMemento & GetMemento() { return m_Closure; }
	void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }

private:	// Invoker for static functions
	RetType InvokeStaticFunction(Param1 p1, Param2 p2) const {
	return (*(m_Closure.GetStaticFunction()))(p1, p2); }
};

//N=3
template<class Param1, class Param2, class Param3, class RetType=detail::DefaultVoid>
class FastDelegate3 {
private:
	typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
	typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3);
	typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3);
	typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2, Param3 p3);
	typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
	ClosureType m_Closure;
public:
	// Typedefs to aid generic programming
	typedef FastDelegate3 type;

	// Construction and comparison functions
	FastDelegate3() { clear(); }
	FastDelegate3(const FastDelegate3 &x) {
		m_Closure.CopyFrom(this, x.m_Closure); }
	void operator = (const FastDelegate3 &x)  {
		m_Closure.CopyFrom(this, x.m_Closure); }