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cpplearner has asked 13 questions and find answers to 155 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

What does "PKc", as the output of typeid(var).name(), mean?
std::equal_to<void>{}(A1, B1) does not compile, while A1 == B1 compiles in C++26 for unscoped enums?
Can formal parameters inside the function not be dropped even if the function returns until the caller statement ends?
C++20's std::views::filter not filtering the view correctly
Isn't a struct with a reference data member a literal type?
Is clang broken with `-std=c++20` and `-Wdtor-name`
How is std::vector able to be constexpr without constexpr std::uninitialized_copy?
auto open_flags = std::ios::binary; seems to produce the wrong type in MSVC. Is it a bug?
How to apply a concept to a trailing return type
How does overload resolution select from multiple prospective destructors?