HP 3000 Manuals HP 3000 Manuals
Switch Stubs A switch stub is a program that allows your Native Mode HP COBOL II/XL program to call a subprogram compiled in Compatibility Mode. You do not have to change or recompile your program or the subprogram. Figure 4-1 shows how a switch stub works. When the program calls the subprogram, what actually happens is that the program calls the switch stub and the switch stub calls the subprogram. This is transparent to the program and subprogram, except that performance is slower.Click here to view figure. Figure 4-1. How a Switch Stub Works You must write a switch stub for each Compatibility Mode subprogram that your program calls. You can create Pascal switch stubs using the Switch Assist Tool (SWAT). SWAT is an interactive utility. See "Calling Subprograms Written in SPL" for an example that uses SWAT. For complete information on SWAT, see the Switch Programming User's Guide.