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cpplearner has asked 13 questions and find answers to 135 problems.

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cpplearner questions

In C++20, is a macro considered "active" if it's #undef'd, then #define'd again?
Why do Clang and MSVC not like a member typedef declaration with a redundant set of parentheses?
Three-way comparison and constexpr function template: which compiler is right?
Declaring defaulted assignment operator as constexpr: which compiler is right?

cpplearner answers

Why the superfluous calls to filter functions when `std::views::reverse` is used?
Use sizeof with incomplete type inside std::conditional
How does changing a template argument from a type to a non-type make SFINAE work?
Have there ever been silent behavior changes in C++ with new standard versions?
Contexts in which pack expansions can occur
Can `co_yield` return a value from the caller on resumption of the coroutine?
cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
typename, type members and non-type members: is it valid code?
User-defined Literal Operator on Macros
Can a class containing a function pointer be used as a non-type template parameter?