return a line back to the stream

[toton]

Hi,
I am parsing a file, and while reading I use getline to read a line
from the stream. However if I found the line contains a specific
format like "START", then I want to push it back into the stream so
that the next processing unit get "START" while calling getline.
How to pushback a like which was already read from the stream to the
stream?
Standard io library supports this? or any additional library needed?


Thanks in advance ...

abir

 

[Eric Pruneau]

Hi,
I am parsing a file, and while reading I use getline to read a line
from the stream. However if I found the line contains a specific
format like "START", then I want to push it back into the stream so
that the next processing unit get "START" while calling getline.
How to pushback a like which was already read from the stream to the
stream?
Standard io library supports this? or any additional library needed?


Thanks in advance ...

abir

Check for the putback function or unget in istream

eric

 

[Ivan Vecerina]

: I am parsing a file, and while reading I use getline to read a line
: from the stream. However if I found the line contains a specific
: format like "START", then I want to push it back into the stream so
: that the next processing unit get "START" while calling getline.
: How to pushback a like which was already read from the stream to the
: stream?
: Standard io library supports this? or any additional library needed?
No. You can reliably return a single char back into the stream,
but nothing more.
If you need to be able to buffer a complete line,
you need to handle this manually in a small wrapper.

hth -Ivan