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);
    }
    
    void clear() noexcept {
      *this = event {};
    }
  };
}