How to use a package buffer

Explains how to use TPckg< > .

The following code fragments show an object or a C type struct being written to a file:

      
       
      
      TXxx x;                    // some structure
TPtr8 xDes(&x, sizeof(x)); // descriptor of that structure
file.Write(xDes);          // write structure to file
     

While this approach works, it is not type safe. The descriptor could be mistaken as referring to an object which is not of type TXxx .

Use a package buffer which works in a similar way but enforces type safety, as the following code fragment shows:

      
       
      
      TXxx x;                    // some structure
TPckg<TXxx> xDes(x);       // make into a package
file.Write(xDes);          // now write structure t file