In-memory array output stream?

[Laurens]

Hi,


My application needs to create in-memory arrays, the size of which is not
known, or very hard to calculate, in advance. I would like to stream the
data using the standard I/O class framework. The class should take care of
the underlying memory management. Now which class is most suitable for this?
(Assuming there is one.) Will std:strstream do the trick?

In Java I use java.io.ByteArrayOutputStream to create in-memory data.


Thanks
-Laurens

 

[Jeff Schwab]

Hi,


My application needs to create in-memory arrays, the size of which is not
known, or very hard to calculate, in advance

On second reading, I assume you mean "in advance of the I/O I'm about to
tell you about."

I would like to stream the
data using the standard I/O class framework. The class should take care of
the underlying memory management. Now which class is most suitable for this?
(Assuming there is one.) Will std:strstream do the trick?
Yes.

In Java I use java.io.ByteArrayOutputStream to create in-memory data.

When you spit the string from the ostrstream into the output stream,
make sure you flush the buffer. Most of the standard c++ streams (cout,
clog, fstream's, etc.) are buffered by default.

 

[Dietmar Kuehl]

My application needs to create in-memory arrays, the size of which is not
known, or very hard to calculate, in advance. I would like to stream the
data using the standard I/O class framework. The class should take care of
the underlying memory management. Now which class is most suitable for this?
(Assuming there is one.) Will std:strstream do the trick?

Yes, it would. However, you should probably rather use 'std:stringstream'
because 'std:strstream' is deprected: it has several serious problems
which 'std:stringstream' has not. The only issue which 'std:strstream'
solves which 'std:stringstream' does not is writing to a buffer supplied
by the user. However, a corresponding stream buffer is easy to write and
not what you need if you can't predict the size of the generated output.