This text provides a comprehensive understanding of object-oriented concepts by developing a theory that accounts for both the Simula and CLOS languages. It shows that it is possible to smoothly integrate both languages into a unique language.
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The language Simula is the precursor of all object-oriented languages. It imposed a certain style of programming that was followed by all class-based object-oriented languages until the appearance of the so-called multiple-dispatching languages such as CLOS, in which a different style of object-oriented programming arose. This new style was induced by the clear separation in these languages between objects and methods.
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