BoP questions

BoP answers

• How to use c++20 <ranges> in xcode 13?
• Why can't I call a member function on an unnamed struct?
• Is it allowed to call `deallocate` on a moved-from allocator (MSVC standard containers do)
• Why is heterogenous std::*map lookup opt-in in C++? [duplicate]
• C++23 std::print [duplicate]
• Why do algorithms use iterator_traits<T>::value_type instead of iter::value_type? [duplicate]
• a function declaration without a prototype is deprecated in all versions of C and is not supported in C2x
• Why void() redefines a function in C++?
• Forward declaring a specific template instance
• std::move and lifetime of temporary objects