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    <p>Of course it's very easy to explain a million reasons why OOP is a good thing. These include: design patterns, abstraction, encapsulation, modularity, polymorphism, and inheritance.</p> <hr> <p><strong>When not to use OOP:</strong></p> <ul> <li><strong>Putting square pegs in round holes:</strong> Don't wrap everything in classes when they don't need to be. Sometimes there is no need and the extra overhead just makes your code slower and more complex. </li> <li><strong>Object state can get very complex:</strong> There is a really good quote from <a href="http://en.wikipedia.org/wiki/Joe_Armstrong_(programming)" rel="noreferrer">Joe Armstrong</a> who invented Erlang:</li> </ul> <blockquote> <p>The problem with object-oriented languages is they’ve got all this implicit environment that they carry around with them. You wanted a banana but what you got was a gorilla holding the banana and the entire jungle.</p> </blockquote> <ul> <li><strong>Your code is already not OOP:</strong> It's not worth porting your code if your old code is not OOP. There is a quote from <a href="http://en.wikipedia.org/wiki/Richard_Stallman" rel="noreferrer">Richard Stallman</a> in 1995</li> </ul> <blockquote> <p>Adding OOP to Emacs is not clearly an improvement; I used OOP when working on the Lisp Machine window systems, and I disagree with the usual view that it is a superior way to program.</p> </blockquote> <ul> <li><strong>Portability with C:</strong> You may need to export a set of functions to C. Although you can simulate OOP in C by making a struct and a set of functions who's first parameter takes a pointer to that struct, it isn't always natural.</li> </ul> <p>You may find more reasons in this paper entitled <a href="http://doc.cat-v.org/programming/bad_properties_of_OO" rel="noreferrer">Bad Engineering Properties of Object-Oriented Languages</a>.</p> <p><a href="http://en.wikipedia.org/wiki/Object-oriented_programming" rel="noreferrer">Wikipedia's Object Oriented Programming page</a> also discusses some pros and cons.</p>
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    1. POFor C/C++, When is it beneficial not to use Object Oriented Programming?
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    1. CO+1, not only slower but harder to read
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    2. COI do agree with the answer: it can be slower, but doesn't need to be! But why is it harder to read (if you know the language - But non-OOP code is harder to read as well if you don't now the language.)? I mean: looking at OOP-code is like watching education videos for children: You got a class A playing around with class B whose purpose is to control class C and so on.. In non-OOP you got functions calling other function in an endless amount of complexity, so that you have to understand everything before changing anything. (in OOP you just need to understand the module you're working on).
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    3. COI agree, I use OOP every chance I get. My focus was to find counter reasons though. You may be making a small function to do something that is self contained though, and in cases like that there is no need to wrap it in a class, make a constructor, make a destructor, ...
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