event.hpp

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#pragma once
#include <utility>

namespace xtd {
  template<typename object_t, typename handler_t>
  class event : protected handler_t {
    friend object_t;
  public:
    
    [[nodiscard]] auto is_empty() const noexcept -> bool {return handler_t::is_empty();}
    
    
    auto operator +=(const handler_t& handler) noexcept -> handler_t& {return handler_t::operator +=(handler);}
    auto operator +=(handler_t&& handler) noexcept -> handler_t& {return handler_t::operator +=(std::forward<handler_t>(handler));}
    
    auto operator +=(const typename handler_t::function_t& function) noexcept -> handler_t& {return handler_t::operator +=(function);}
    auto operator +=(typename handler_t::function_t&& function) noexcept -> handler_t& {return handler_t::operator +=(function);}
    
    template<typename fn_t>
    auto operator +=(fn_t&& function) noexcept -> handler_t& {return handler_t::operator +=(std::forward<fn_t>(function));}
    
    auto operator -=(const handler_t& handler) noexcept -> handler_t& {return handler_t::operator -=(handler);}
    
    auto operator -=(const typename handler_t::function_t& function) noexcept -> handler_t& {return handler_t::operator -=(function);}
    
    template<typename fn_t>
    auto operator -=(fn_t function) noexcept -> handler_t& {return handler_t::operator -=(function);}
    
    auto clear() noexcept -> void {*this = event {};}
  };
}