119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
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/** \file
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* Connection-point traits.
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*/
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/* Copyright <20> 2002 Michael Geddes
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* Copyright <EFBFBD> 2013 Alexander Lamaison
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*
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* This material is provided "as is", with absolutely no warranty
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* expressed or implied. Any use is at your own risk. Permission to
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* use or copy this software for any purpose is hereby granted without
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* fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is
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* granted, provided the above notices are retained, and a notice that
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* the code was modified is included with the above copyright notice.
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*
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* This header is part of Comet version 2.
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* https://github.com/alamaison/comet
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*/
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#ifndef INCLUDE_COMET_CPTRAITS_H
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#define INCLUDE_COMET_CPTRAITS_H
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#ifdef _SHOW_INC
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#pragma message(" #Include " __FILE__)
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#endif
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#include <comet/config.h>
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#include <comet/error_fwd.h> // raise_exception
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#include <Windows.h> // HRESULT
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namespace comet
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{
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/*! \struct cp_throw cptraits.h comet/cptraits.h
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* Default 'throw' traits for connection-points.
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* \code Usage
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* connection_point_for<IMySourceInterface>::connection_point.Fire_MyEvent( arg1, comet::cp_throw());
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* \endcode
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*/
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struct cp_throw
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{
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/// Constructor - called before iterating over the connection-points.
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cp_throw() : _hr_(S_OK) { }
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/// Destructor - called after iterating over all the connection-points.
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~cp_throw() { _hr_ | raise_exception ; }
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/*! Called when a connection point fails.
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* Can also be used to remember the hresult for the destructor.
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*
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* \retval true Cause the on_fail method to be called.
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* \retval false Ignore the failure.
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*/
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bool check_fail(HRESULT hr)
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{
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if( FAILED(hr) )
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_hr_ = hr;
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return false;
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}
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/*! Called when check_fail returns true.
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* \param par_connects Reference to the STL container containing the connection-points.
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* \param par_it The iterator of the failed connection-point.
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*/
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template<typename CONNECTIONS>
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static bool on_fail(CONNECTIONS &par_connects, const typename CONNECTIONS::iterator & par_it)
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{
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COMET_NOTUSED(par_it);
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COMET_NOTUSED(par_connects);
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return false;
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}
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protected:
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HRESULT _hr_;
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};
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/*! \struct cp_nothrow_remove cptraits.h comet/cptraits.h
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* Traits for connection-points, errors cause the connection-point to auto-remove.
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* \code
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* connection_point_for<IMySourceInterface>::connection_point.Fire_MyEvent( arg1, comet::cp_nothrow_remove());
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* \endcode
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* \sa cp_throw
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*/
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struct cp_nothrow_remove
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{
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//! Called when a connection point fails.
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bool check_fail( HRESULT _hr_) throw() { return FAILED(_hr_); }
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//! Called when check_fail returns true.
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template<typename CONNECTIONS>
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static bool on_fail(CONNECTIONS &par_connects, const typename CONNECTIONS::iterator &par_it ) throw()
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{
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try{ par_connects.erase(par_it); }catch(...) {}
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return false;
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}
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};
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/*! \struct cp_nothrow cptraits.h comet/cptraits.h
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* Tratis for connection-points, errors are ignored.
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* \code
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* connection_point_for<IMySourceInterface>::connection_point.Fire_MyEvent( arg1, comet::cp_nothrow());
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* \endcode
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* \sa cp_throw
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*/
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struct cp_nothrow
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{
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//! Called when a connection point fails.
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bool check_fail( HRESULT _hr_) throw() { return FAILED(_hr_); }
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//! Called when check_fail returns true.
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template<typename CONNECTIONS>
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static bool on_fail(CONNECTIONS &par_connects, const typename CONNECTIONS::iterator &par_it ) throw() { return false; }
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};
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}
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#endif /* INCLUDE_COMET_CPTRAITS_H */
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