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Separating the class header I (the declaration) from the implementation makes it easier to distribute classes in binary form, either for convenience or to protect intellectual property. To use a class you always need the class declaration in source form, but the implementation can be either source or binary code (e.g. a standalone LIB or LIB+DLL).
Using classes
You now have enough information to start using classes others have created. Feel free to download the DevRoadmaps Clarion Library and try out some of the classes. Probably the easiest place to start is with the DCL_System_String class.
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