event.h

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#pragma once
 
namespace xtd {
  template<typename object_t, typename handler_t>
  class event : protected handler_t {
    friend object_t;
  public:
    bool is_empty() const noexcept { return handler_t::is_empty(); }
 
    handler_t& operator+=(const handler_t& handler) noexcept {
      return handler_t::operator+=(handler);
    }
    
    handler_t& operator+=(const typename handler_t::function_t& function) noexcept {
      return handler_t::operator+=(function);
    }
    
    template<typename fn_t>
    handler_t& operator+=(fn_t function) noexcept {
      return handler_t::operator+=(function);
    }
    
    handler_t& operator-=(const handler_t& handler) noexcept {
      return handler_t::operator-=(handler);
    }
    
    handler_t& operator-=(const typename handler_t::function_t& function) noexcept {
      return handler_t::operator-=(function);
    }
    
    template<typename fn_t>
    handler_t& operator-=(fn_t function) noexcept {
      return handler_t::operator-=(function);
    }
  };
}