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macro_rules! define_event {
    (
        ($input: ty, $output: ty) {
            $event_none_ident: ident: $func_none_type: ty,
            $event_input_ident: ident: $func_input_type: ty,
            $event_output_ident: ident: $func_output_type: ty,
            $event_input_output_ident: ident: $func_input_output_type: ty
        }
    ) => {
        define_event_header!($event_none_ident: $func_none_type);
        define_event_header!($event_input_ident: $func_input_type);
        define_event_header!($event_output_ident: $func_output_type);
        define_event_header!($event_input_output_ident: $func_input_output_type);

        impl $event_none_ident {
            pub unsafe fn call(&self) -> Result<()> {
                let funcs_ref = &self.funcs;

                for func in funcs_ref {
                    try!(func.call().map_err(|err| Error::from(err)));
                }

                Ok(())
            }
        }

        impl $event_input_ident {
            pub unsafe fn call(&self, input: $input) -> Result<()> {
                let funcs_ref = &self.funcs;

                for func in funcs_ref {
                    try!(func.call(input).map_err(|err| Error::from(err)));
                }

                Ok(())
            }
        }

        impl $event_output_ident {
            pub unsafe fn call(&self) -> Result<Vec<$output>> {
                let mut result = Vec::with_capacity(self.funcs.len());

                let funcs_ref = &self.funcs;

                for func in funcs_ref {
                    let output = try!(func.call().map_err(|err| Error::from(err)));
                    result.push(output);
                }

                Ok(result)
            }
        }

        impl $event_input_output_ident {
            pub unsafe fn call(&self, input: $input) -> Result<Vec<$output>> {
                let mut result = Vec::with_capacity(self.funcs.len());

                let funcs_ref = &self.funcs;

                for func in funcs_ref {
                    let output = try!(func.call(input).map_err(|err| Error::from(err)));
                    result.push(output);
                }

                Ok(result)
            }
        }
    }
}