Tools.h++ Manual

5-8 104011 Tandem Computers Incorporated

Program output:

2 lines, skipping whitespace.

5 lines, not skipping whitespace.

Virtual streams

String operators to and from virtual streams are also supported:

RWvistream&operator>>(RWvistream& vstream, RWCString&

cstr);

RWvostream&operator<<(RWvostream& vstream, const

RWCString& cstr);

This allows a string to be saved and restored without knowing the formatting

that is to be used. See Chapter 16, “Persistence” for details on virtual streams.

5.6 Tokenizer

Class

RWCTokenizer

can be used to break a string up into tokens, separated

by an arbitrary "white space". See Part 2: Class Reference, under

RWCTokenizer

, for additional details. Here's an example:

#include <rw/ctoken.h>

#include<rw/cstring.h>

#include <rw/rstream.h>

main()

{

RWCString a("a string with five tokens");

RWCTokenizer next(a);

int i = 0;

// Advance until the null string is returned:

while( !next().isNull() ) i++;