C++ implementation of X protocol events

types.hpp

#include <iostream>

//namespace protocol {
//namespace type {
struct event {
    enum event_enum {
        key_press              = 0x00000001,
        key_release            = 0x00000002,
        button_press           = 0x00000004,
        // many others
        zero                   = 0xfe000000,
    };
};
typedef event::event_enum event_enum;

struct pointer_event : event {
    static event_enum const zero = static_cast<event_enum>(0xffff8003);
};
typedef event::event_enum pointer_event_enum;

struct device_event : event {
    static event_enum const zero = static_cast<event_enum>(0xffffc0b0);
};
typedef event::event_enum device_event_enum;

//}}
// namespaces end

int main()
{
    event_enum normal_event_zero = event::zero;
    pointer_event_enum pointer_event_zero = pointer_event::zero;
    device_event_enum device_event_zero = device_event::zero;

    std::cout << normal_event_zero << std::endl;
    std::cout << pointer_event_zero << std::endl;
    std::cout << device_event_zero << std::endl;
  
    return 0;
}