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why did people said one advantage of abstract intereface is update of software.

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just send customer the new file (containing new class and implementation)like: new dll. if you send customer file ,why not just send new main program ? to customer ,all he must do is copy file to directory of program, so what is different between copying a dll and copying main .exe?

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Because commercial engines are often designed modularly, with each part being in a dll -- so to update a section, you update the DLL and just send that as the update. Because everything is abstract, it shouldn't alter the rest of the way the program runs. Therefore, why would you resend the *.exe when all you really need to send is a mcuh smaller *.dll?

(this also applies to *.so)

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The customer doesn't care.

By using abstract interfaces, making the updated dll or exe is far far easier for programers, and will have fewer bugs since they only have to update the "concrete" part of the interface, not the interface itself, or every single part of the program that uses the interface.

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