Re: [Boost-users] newbie - boost::shared_ptr of type stringstream using << operator?

From: Ed Johnson (ed_at_[hidden])
Date: 2006-05-15 17:31:36

EMalenfant_at_[hidden] wrote:
> From: Ed Johnson [mailto:ed_at_[hidden]] 
>> Thanks, I see where I was not using the correct constructor before.
>> However, even when I use the proper one, I get the same 
>> results. I cannot get the '<<' operator to append to the 
>> original string that I pass using the stringstream 
>> constructor. It still begins at the first character and 
>> begins overwriting the string.
>>
>> //constructor syntax
>> explicit stringstream ( openmode mode = in | out  ); explicit 
>> stringstream ( const string & str, openmode mode = in | out );
>>
>> //updated code
>> boost::shared_ptr< std::stringstream > sharedStream(new 	
>> 	 
>> std::stringstream("hello world", std::stringstream::out));
>>
>> Is there something else I'm missing?
>>
> 
> I think you have to use the "ate" or "app" openmode for that.
> 
> HTH,
> 
> Éric

Hi Eric,

  I tried and none of the following modes worked.

boost::shared_ptr< std::stringstream > sharedStream(new 		
std::stringstream("hello world", std::stringstream::out  | 
std::stringstream::ate ));

boost::shared_ptr< std::stringstream > sharedStream(new 		
std::stringstream("hello world", std::stringstream::out  | 
std::stringstream::app ));

boost::shared_ptr< std::stringstream > sharedStream(new 		
std::stringstream("hello world", std::stringstream::app ));

boost::shared_ptr< std::stringstream > sharedStream(new 		
std::stringstream("hello world", std::stringstream::ate ));

Thanks,

Ed