How do concepts (C++20) relate to namespaces? Are there any proposals for future changes or additions to the std namespace?

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what does using namespace std do Informational

• How do enums and enum classes interact with namespaces? If an enum is defined within a namespace, is the enum type and its enumerators part of that namespace?
• Can namespaces be used to manage different device interfaces or protocols?
• Which header file provides definitions for smart pointers? How do mathematical functions relate to the std namespace?
• Can we simulate namespace-like behavior in C if needed?
• Do debuggers provide any special features for inspecting namespaces?
• Can we create our own namespaces? How do we define a namespace in C++?
• How do namespaces interact with mocking frameworks for C++?
• How can we use the scope resolution operator with namespaces? Can we have unnamed namespaces within named namespaces?
• How do other programming languages handle the concept of namespaces or modules? What are the similarities and differences between C++ namespaces and namespaces/modules in other languages (e.g., Python, Java, C#)?
• Can ADL resolve names across different namespaces?