/usr/include/ossim/base/ossimCallback2wRet.h is in libossim-dev 1.8.16-3+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// File: ossimCallback2wRet.h
//
// License: LGPL
//
// See LICENSE.txt file in the top level directory for more details.
//
// Author: David Burken
//
// Description:
//
// Simple templated callback class that takes a two parameters(arguments) "P1"
// and has a return "RT".
//
// See link for more detail description:
// http://www.tutok.sk/fastgl/callback.html
//
//----------------------------------------------------------------------------
// $Id$
#ifndef ossimCallback2wRet_HEADER
#define ossimCallback2wRet_HEADER 1
/**
* @class ossimCallback2wRet
*
* Usage example, note template params can be anything:
*
* Caller interface to register callback:
*
* @code
* void registerCallback(ossimCallback2wRet<const ossimFilename&, bool&, bool>* cb);
* @endcode
*
* Callee creation of call back mechanism:
*
* @code
* class ProcessFileCB: public ossimCallback2wRet<const ossimFilename&, bool&, bool>
* {
* public:
* ProcessFileCB(
* ossimImageElevationDatabase* obj,
* bool (ossimImageElevationDatabase::*func)(const ossimFilename&, bool&))
* :
* m_obj(obj),
* m_func(func)
* {}
*
* virtual bool operator()(const ossimFilename& file, bool& flag) const
* {
* return ( m_obj->*m_func)(file, flag);
* }
*
* private:
* ossimImageElevationDatabase* m_obj;
* bool (ossimImageElevationDatabase::*m_func)(const ossimFilename& file, bool& flag);
* };
* @endcode
*
* Making/registering a callback.
*
* @code
* ossimFileWalker* fw = new ossimFileWalker();
*
* ossimCallback2wRet<const ossimFilename&, bool&, bool>* cb =
* new ProcessFileCB(this, &ossimImageElevationDatabase::processFile);
*
* fw->registerProcessFileCallback(cb);
*
* @endcode
*/
template <class P1, class P2, class RT> class ossimCallback2wRet
{
public:
ossimCallback2wRet(){}
virtual ~ossimCallback2wRet(){}
virtual RT operator()(P1 p1, P2 p2) const = 0;
};
#endif /* #ifndef ossimCallback2wRet_HEADER */
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