What is the reason for C++ permitting the definition of classes with identical names but different definitions in separate files?

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One reason for allowing the definition of classes with identical names but different definitions in separate files is to support modularity and code reuse. This allows developers to split their code into multiple files, each containing a different implementation of a class with the same name. This enables the creation of libraries or modules that can be used in multiple projects, without the need to change the class names. Additionally, it can make it easier to isolate and debug specific parts of the code, as each implementation of the class can be compiled and tested separately.