Caleth questions

Caleth answers

• Generic way to use fs::recursive_directory_iterator() and fs::directory_iterator()
• Why does a virtual default destructor make a class non-trivially-destructible?
• How to return const reference from std::optional::value_or?
• std::flat_map, std::flat_set and reserving storage?
• Nested monadic operations produces unreadable code
• Difference between Flux.concat and Flux.concatWith
• Template definition in .h file requires me to include .h files, C++
• Unexpected call to constructor when non-throwing operator new returns a nullptr
• Function that accepts any pointer type
• C++: How to catch exceptions thrown from constructors?