Dr. Gut

Dr. Gut has asked 20 questions and find answers to 3 problems.

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Dr. Gut questions

Undefined class template is not instantiated to check for friend functions
Const-correctness of std::reference_wrapper
Can you overwrite the memory of a union, if no members are active?
Why is mutable lambda converted to function pointer instead of calling operator()?
Pointer to abominable function type? Compiler bug?
Why can't we specialize concepts?
Error message with operator syntax, but not with function syntax
ADL does not work in constexpr functions (clang only)
Argument-dependent lookup of dependent names
Warning: function 'F' is not needed and will not be emitted

Dr. Gut answers

Creating compile-time Key-Value map in C++
Why does MSVC compile this?
What types are trivially constructible?