/usr/include/simgear/structure/callback.hxx is in libsimgear-dev 3.4.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* callback.hxx -- Wrapper classes to treat function and method pointers
* as objects.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id$
**************************************************************************/
#ifndef _SG_CALLBACK_HXX
#define _SG_CALLBACK_HXX
/**
* Abstract base class for all callbacks.
*/
class SGCallback
{
public:
/**
*
*/
virtual ~SGCallback() {}
/**
*
*/
virtual SGCallback* clone() const = 0;
/**
* Execute the callback function.
*/
virtual void operator()() = 0;
protected:
/**
*
*/
SGCallback() {}
private:
// Not implemented.
void operator=( const SGCallback& );
};
/**
* Callback for invoking a file scope function.
*/
template< typename Fun >
class SGFunctionCallback : public SGCallback
{
public:
/**
*
*/
SGFunctionCallback( const Fun& fun )
: SGCallback(), f_(fun) {}
SGCallback* clone() const
{
return new SGFunctionCallback( *this );
}
void operator()() { f_(); }
private:
// Not defined.
SGFunctionCallback();
private:
Fun f_;
};
/**
* Callback for invoking a member function.
*/
template< class ObjPtr, typename MemFn >
class SGMethodCallback : public SGCallback
{
public:
/**
*
*/
SGMethodCallback( const ObjPtr& pObj, MemFn pMemFn )
: SGCallback(),
pObj_(pObj),
pMemFn_(pMemFn)
{
}
/**
*
*/
SGCallback* clone() const
{
return new SGMethodCallback( *this );
}
/**
*
*/
void operator()()
{
((*pObj_).*pMemFn_)();
}
private:
// Not defined.
SGMethodCallback();
private:
ObjPtr pObj_;
MemFn pMemFn_;
};
/**
* Helper template functions.
*/
template< typename Fun >
SGCallback*
make_callback( const Fun& fun )
{
return new SGFunctionCallback<Fun>(fun);
}
template< class ObjPtr, typename MemFn >
SGCallback*
make_callback( const ObjPtr& pObj, MemFn pMemFn )
{
return new SGMethodCallback<ObjPtr,MemFn>(pObj, pMemFn );
}
#endif // _SG_CALLBACK_HXX
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