On ApComputer Associates and GrafX Software announced they had reached a Development, Licensing, and Marketing Agreement for two of their software development languages - CA-Clipper and CA-Visual Objects.Īs the product matured, it remained a DOS tool for many years, but added elements of the C programming language and Pascal programming language, as well as OOP, and the code-block data-type (hybridizing the concepts of dBase macros, or string-evaluation, and function pointers), to become far more powerful than the original. Clipper was created by Nantucket Corporation, and later sold to Computer Associates.
p-code is considerably faster, but still not as fast as the machine code generated by native compilers. Compiling dBASE code changes it from interpreted code (i.e., human-readable source code), which must be interpreted every time each line of code is executed, to p-code (or pseudo-code), which uses a Virtual Machine to process the compiled p-code. Clipper was originally created in 1985 as a compiler for dBASE III, a very popular database language at the time.
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