Worse yet is an object which is safe to copy in some cases, but you intended to not copy it at the moment, and you create a dangling reference to a field withi

Worse yet is an object which is safe to copy in some cases, but you intended to not copy it at the moment, and you create a dangling reference to a field within. I wish C++ copy constructors were explicit by default. (But declaring the copy constructor explicit turns off aggregate initialization, so I can't do that.)