cptraits.h

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00001 
00005 /* Copyright © 2002 Michael Geddes
00006  *
00007  * This material is provided "as is", with absolutely no warranty 
00008  * expressed or implied. Any use is at your own risk. Permission to 
00009  * use or copy this software for any purpose is hereby granted without 
00010  * fee, provided the above notices are retained on all copies. 
00011  * Permission to modify the code and to distribute modified code is 
00012  * granted, provided the above notices are retained, and a notice that 
00013  * the code was modified is included with the above copyright notice. 
00014  *
00015  * This header is part of comet.
00016  * http://www.lambdasoft.dk/comet
00017  */
00018 
00019 #ifndef INCLUDE_COMET_CPTRAITS_H
00020 #define INCLUDE_COMET_CPTRAITS_H
00021 
00022 #ifdef _SHOW_INC
00023 #pragma message("   #Include " __FILE__)
00024 #endif
00025 
00026 #include <comet/config.h>
00027 
00028 namespace comet
00029 {
00036         struct cp_throw
00037         {
00038 
00040                 cp_throw() : _hr_(S_OK) { }
00041 
00043                 ~cp_throw() { _hr_ | raise_exception ; }
00044 
00051                 bool check_fail(HRESULT hr)
00052                 {
00053                         if( FAILED(hr) )
00054                                  _hr_ = hr;
00055                         return false;
00056                 }
00057 
00062                 template<typename CONNECTIONS>
00063                 static bool on_fail(CONNECTIONS &par_connects, const typename CONNECTIONS::iterator &par_it )
00064                 { return false;}
00065 
00066         protected:
00067                 HRESULT _hr_;
00068 
00069         };
00070 
00078         struct cp_nothrow_remove
00079         {
00081                 bool check_fail( HRESULT _hr_) throw() { return FAILED(_hr_); }
00082 
00084                 template<typename CONNECTIONS>
00085                 static bool on_fail(CONNECTIONS &par_connects, const typename CONNECTIONS::iterator &par_it ) throw()
00086                 {
00087                         try{ par_connects.erase(par_it); }catch(...) {}
00088                         return false;
00089                 }
00090         };
00091 
00092 
00100         struct cp_nothrow
00101         {
00103                 bool check_fail( HRESULT _hr_) throw() { return FAILED(_hr_); }
00104 
00106                 template<typename CONNECTIONS>
00107                 static bool on_fail(CONNECTIONS &par_connects, const typename CONNECTIONS::iterator &par_it ) throw() { return false; }
00108         };
00109 };
00110 #endif /* INCLUDE_COMET_CPTRAITS_H */