Re: [boost] [transact] code in sandbox

Subject: Re: [boost] [transact] code in sandbox
From: strasser_at_[hidden]
Date: 2010-02-17 10:03:56

Zitat von "Stewart, Robert" <Robert.Stewart_at_[hidden]>:
>> control ctrl;
>> while(true){
>>    try{
>>      transaction tx;
>>      commit_on_destruction destr(tx);
>>      try{
>>        do{
>>          ctrl=break_;
>>
>>          //...user code
>>          if(something) break;
>>          else if(something_else) continue;
>>          else return 5;
>>          //...end user code
>>
>>          ctrl=none;
>>          break;
>>        }while((ctrl=continue_),false);
>>      }catch(...){
>>        destr.nullify();
>>        throw;
>>      }
>>      break;
>>    }catch(isolation_exception &){}
>> };
>> if(ctrl==continue_) continue;
>> else if(ctrl==break_) break;
>
> Couldn't you avoid the inner try block by detecting a pending  
> exception in ~commit_on_destruction()?

because of how std::uncaught_exception() works that would fail if the  
macros are used inside a destructor that is called during exception  
unwinding:

http://www.gotw.ca/gotw/047.htm