string stream question

[JM]

Hi,


If you change the same string stream to a new string, why is it that
you have to .clear() it before using it? If I don't I get garbage.

Thanks,
Jason

ex.

string a = "12";
string b = "15";
float fa,fb;

istringstream is;

is.str(a);

is>>fa;

is.clear( ) // must do this....

is.str(b)

is>>fb

 

[Victor Bazarov]

Hi,


If you change the same string stream to a new string, why is it that
you have to .clear() it before using it? If I don't I get garbage.

Thanks,
Jason

ex.

string a = "12";
string b = "15";
float fa,fb;

istringstream is;

is.str(a);

is>>fa;

is.clear( ) // must do this....

is.str(b)

is>>fb

It probably because changing strings is not coupled with clearing
any errors. The state of the stream is still "end-of-file", which
you have to clear before you can read again.

Victor

 

[JM]

It probably because changing strings is not coupled with clearing
any errors. The state of the stream is still "end-of-file", which
you have to clear before you can read again.

Victor

That makes sense, thanks Victor.

-JM