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Namespace is a very useful concept in programming, mainly used to solve the problem of naming conflicts of identifiers (variables, types, functions, etc.). Here are some of the main reasons to use namespaces:
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Prevent naming conflicts : When working in a large project or a multi-module project, there may be multiple developers using the same name for their variables or functions. Namespaces can help organize these identifiers to ensure that they do not conflict with each other.
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Improve code readability : By using namespaces, you can better organize your code and clearly express which module or library a certain identifier belongs to.
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Code reuse : Namespaces allow you to reuse code with the same name in different environments. For example, both libraries have a class called "Vector". By using namespaces, both libraries can be used in the same program without conflict.
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Controlling the visibility of identifiers : The namespace mechanism of some programming languages can also control the visibility of identifiers, which helps encapsulate and hide implementation details.
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Version Control : If you need to make breaking changes when releasing a new version of a library, but still want to retain support for older versions, you can use namespaces to differentiate between different versions.
Taking C++ as an example, if two