dcb95d131b
- coplied license headers from h(xx) files to respective c(xx) files - removed trailing spaces - fixe $Id$ - fixed typos
149 lines
2.8 KiB
C++
149 lines
2.8 KiB
C++
/**************************************************************************
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* callback.hxx -- Wrapper classes to treat function and method pointers
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* as objects.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $Id$
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**************************************************************************/
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#ifndef _SG_CALLBACK_HXX
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#define _SG_CALLBACK_HXX
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/**
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* Abstract base class for all callbacks.
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*/
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class SGCallback
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{
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public:
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/**
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*
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*/
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virtual ~SGCallback() {}
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/**
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*
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*/
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virtual SGCallback* clone() const = 0;
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/**
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* Execute the callback function.
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*/
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virtual void operator()() = 0;
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protected:
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/**
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*
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*/
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SGCallback() {}
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private:
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// Not implemented.
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void operator=( const SGCallback& );
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};
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/**
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* Callback for invoking a file scope function.
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*/
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template< typename Fun >
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class SGFunctionCallback : public SGCallback
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{
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public:
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/**
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*
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*/
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SGFunctionCallback( const Fun& fun )
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: SGCallback(), f_(fun) {}
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SGCallback* clone() const
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{
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return new SGFunctionCallback( *this );
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}
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void operator()() { f_(); }
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private:
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// Not defined.
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SGFunctionCallback();
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private:
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Fun f_;
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};
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/**
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* Callback for invoking a member function.
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*/
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template< class ObjPtr, typename MemFn >
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class SGMethodCallback : public SGCallback
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{
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public:
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/**
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*
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*/
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SGMethodCallback( const ObjPtr& pObj, MemFn pMemFn )
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: SGCallback(),
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pObj_(pObj),
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pMemFn_(pMemFn)
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{
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}
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/**
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*
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*/
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SGCallback* clone() const
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{
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return new SGMethodCallback( *this );
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}
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/**
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*
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*/
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void operator()()
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{
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((*pObj_).*pMemFn_)();
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}
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private:
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// Not defined.
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SGMethodCallback();
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private:
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ObjPtr pObj_;
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MemFn pMemFn_;
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};
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/**
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* Helper template functions.
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*/
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template< typename Fun >
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SGCallback*
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make_callback( const Fun& fun )
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{
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return new SGFunctionCallback<Fun>(fun);
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}
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template< class ObjPtr, typename MemFn >
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SGCallback*
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make_callback( const ObjPtr& pObj, MemFn pMemFn )
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{
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return new SGMethodCallback<ObjPtr,MemFn>(pObj, pMemFn );
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}
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#endif // _SG_CALLBACK_HXX
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