C# - EF lifetime of DBContext

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The following article has a useful information on handling the lifetime of DBContext in EF.

http://mehdi.me/ambient-dbcontext-in-ef6/

C++ - std::type_identity_t

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std::type_identity_t was introduced in C++20. Main purpose of this type alias has the following reasons.

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C++20 introduced concept. The following code shows the example of using concept.

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C++ variadic template with lambda

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C++ variadic template fold expression