Table of Contents
Stringstreams (defined in the header <sstream>)
are in this author's opinion one of the coolest things since
sliced time. An example of their use is in the Received Wisdom
section for Chapter 21 (Strings),
describing how to
format strings.
The quick definition is: they are siblings of ifstream and ofstream,
and they do for std::string what their siblings do for
files. All that work you put into writing << and
>> functions for your classes now pays off
again! Need to format a string before passing the string
to a function? Send your stuff via << to an
ostringstream. You've read a string as input and need to parse it?
Initialize an istringstream with that string, and then pull pieces
out of it with >>. Have a stringstream and need to
get a copy of the string inside? Just call the str()
member function.
This only works if you've written your
<</>> functions correctly, though,
and correctly means that they take istreams and ostreams as
parameters, not ifstreams and ofstreams. If they
take the latter, then your I/O operators will work fine with
file streams, but with nothing else -- including stringstreams.
If you are a user of the strstream classes, you need to update
your code. You don't have to explicitly append ends to
terminate the C-style character array, you don't have to mess with
"freezing" functions, and you don't have to manage the
memory yourself. The strstreams have been officially deprecated,
which means that 1) future revisions of the C++ Standard won't
support them, and 2) if you use them, people will laugh at you.
d10 2 a11 2 section for Sect1 21 (Strings), describing how to d37 1 a37 1
d10 2 a11 2 section for Sect1 21 (Strings), describing how to d37 1 a37 1
d10 2 a11 2 section for Sect1 21 (Strings), describing how to d37 1 a37 1