FdeF questions

• using a std::function or a forwarding reference as general-purpose callable object input parameter of a higher-order function?
• Are there cases in which trailing-return-type syntax in lambda cannot be avoided?
• error when defining a std::shared_ptr with new operator
• Why is it possible to use the dereferencing operator multiple times when assigning a function to a function pointer? [duplicate]
• Is it possible to return an object of type T by reference from a lambda without using trailing return type syntax?

FdeF answers