version(RefOut)
	extern(C) void fun(out int input, ref in output);
else
	extern(C) void fun( /*[out]*/ int* input, const(float)* output);
	
version = RefOut;
void main() {
	int input;
	float output;
	fun( input, output ); // work fine; is it correct binding? or where the trouble?
}

On 2016-08-03 10:27, RomanZ wrote:
> version(RefOut)
>     extern(C) void fun(out int input, ref in output);
> else
>     extern(C) void fun( /*[out]*/ int* input, const(float)* output);
>
> version = RefOut;
> void main() {
>     int input;
>     float output;
>     fun( input, output ); // work fine; is it correct binding? or where
> the trouble?
> }

It should work. It depends on how close you would like the D code to be to the C code. For example, the C code requires to pass pointers where in the D code this will handled automatically.

Note also that "out" parameters are automatically reset to there .init value when passed to a function.

-- 
/Jacob Carlborg

thanks.