The Open/Closed Principle, OCP in short, is credited to Bertrand Mayer, a French programmer, who first published it in his book n Object-Oriented Software Construction in 1988. The principle rose in popularity in the early 2000s when it became one of the SOLID principles defined by Robert C. Martin in his book Agile Software Development, Principles, Patterns, and Practices and later republished in the C# version of the book Agile Principles, Patterns, and Practices in C#. What we are basically talking about here is to design our modules, classes and functions in a way that when a new functionality is needed, we should not modify our existing code but rather write new code that will be used by existing code. This sounds a little bit strange, especially if we are working in languages like Java, C, C++ or C# where it applies not only to the source code itself but to the binary also. We want to create new features in ways that will not require us to redeploy existing binaries, executables or DLLs.


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