There's a big issue with C++ classes -- or rather methods. You need to list the entire class definition to expose public methods. That includes private members

There's a big issue with C++ classes -- or rather methods. You need to list the entire class definition to expose public methods. That includes private members and private methods. This breaks encapsulation, exposing implementation details and their dependencies in the public header. This in turn leads to looong compile times and needless recompilations.