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Essential Tools Module User's Guide

5.4 Simple Example

Here is a simple example that exercises RWbostream and RWbistream through their respective abstract base classes, RWvostream and RWvistream:

Program Output:

The job of function save(const RWCString& a, RWvostream& v) is to save the string a to the virtual output stream v. Function recover(RWvistream&) restores the results. These functions do not know the ultimate format with which the string will be stored. Here are some additional comments on particular lines:

//1 On this line, a file output stream f is created for the file junk.dat.
//2 An RWbostream is created from f.
//3 Because this clause is enclosed in braces { ... }, the destructor for f will be called here. This will cause the file to be closed.
//4 The file is reopened, this time for input.
//5 Now an RWbistream is created from it.
//6 The string is recovered from the file.
//7 Finally, both the original and recovered strings are printed for comparison.

You could simplify this program by using class fstream, which multiply inherits ofstream and ifstream, for both output and input. A seek to beginning-of-file would occur before reading the results back in. Since some early implementations of seekg() have not proven reliable, we chose not to use the simpler approach for this example.



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