💡 TL;DR：Basics and beyond: namespaces.

Last updated：2026-10-13

C++ Namespaces

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• Global scope operator (::name): used before a type name (class, class member, member function, variable, etc.) to indicate that the scope is the global namespace
• Class scope operator (class::name): used to indicate that the scope of the given type is a specific class
• Namespace scope operator (namespace::name): used to indicate that the scope of the given type is a specific namespace

For the concrete code see: maohao.cpp

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