lyx_mirror/sigc++/handle.h

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#ifndef SIGCXX_HANDLE_H
#define SIGCXX_HANDLE_H
#include <sigc++/sigc++config.h>
#ifdef SIGC_CXX_NAMESPACES
namespace SigC
{
#endif
// Signiture for Handles
template <class Obj,class Scope_>
class Handle
{
protected:
Scope_ scope_;
public:
// access
Obj* obj()
{
return static_cast<Obj*>(scope_.cache());
}
Obj* obj() const
{
return static_cast<Obj*>(scope_.cache());
}
bool connected() const
{return (scope_.object()!=0);}
operator Obj*()
{return (obj());}
operator Obj*() const
{return (obj());}
Obj& operator*() const
{return *(obj());}
Obj* operator->() const
{return (obj());}
Scope_& scope()
{return scope_;}
const Scope_& scope() const
{return scope_;}
void disconnect()
{scope_.disconnect(0);}
// copy
Handle& operator =(Obj* obj)
{scope_.set(obj,obj,true); return *this;}
Handle& operator =(Obj& obj)
{scope_.set(&obj,&obj,false); return *this;}
#ifndef SIGC_CXX_TEMPLATE_CCTOR
Handle& operator =(const Handle& handle)
{
Obj *o=handle.obj();
scope_.set(o,o,false);
return *this;
}
#endif
template <class Obj2,class Scope2>
Handle& operator = (const Handle<Obj2,Scope2>& handle)
{
Obj *o=handle.obj();
scope_.set(o,o,false);
return *this;
}
// construct
Handle():scope_() {}
Handle(Obj *obj):scope_() {scope_.set(obj,obj,true);}
Handle(Obj &obj):scope_() {scope_.set(&obj,&obj,false);}
#ifndef SIGC_CXX_TEMPLATE_CCTOR
Handle(const Handle& handle)
:scope_()
{
Obj *o=handle.obj();
scope_.set(o,o,false);
}
#endif
template <class Obj2,class Scope2>
Handle(const Handle<Obj2,Scope2>& handle)
:scope_()
{
Obj *o=handle.obj();
scope_.set(o,o,false);
}
};
#define HANDLE_CTORS(X,T,P) \
public: \
X(T *t):Handle<T,P>(t) {} \
X(T &t):Handle<T,P>(t) {} \
template <class T2,class P2> \
X(const Handle<T2,P2> &h):Handle<T,P>(h) {} \
X& operator =(T *t) \
{return Handle<T,P>::operator=(t);} \
X& operator =(T &t) \
{return Handle<T,P>::operator=(t);} \
template <class T2,class P2> \
X& operator =(const Handle<T2,P2> &t) \
{return Handle<T,P>::operator=(t);}
//template <class T>
// class Ref:public Handle<T,Scopes::RefCount>
// {
// HANDLE_CTORS(Ref,T,Scopes::RefCount)
// };
#ifdef SIGC_CXX_NAMESPACES
} // namespace
#endif
#endif