What you're looking for is reflect.Type.NumIn()int and reflect.Type.In(i
int) Type.
See example here https://play.golang.org/p/q1D56Abj-5
On Tuesday, March 21, 2017 at 12:01:09 AM UTC+1, Tyler Compton wrote:
>
> I'm trying to create an HTTP request router library that automatically
> decodes parameters in the request URL and passes them as arguments to the
> handler function. It would theoretically make something like this possible:
>
> myRouter.HandleFunc("/getPuppies/{id}", func(w http.ResponseWriter, r *
> http.Request, id string) {
> // Handle the request
> });
>
> I am aware that you can't get the name of a function's arguments. That's
> okay with me, I can just pass the params in the order they appear. However,
> I do need to be able to check how many arguments a function has and what
> the types of those arguments are, so I can type assert the parameters and
> give sane error messages when the user makes a mistake.
>
> Before you point out that this is a bad idea and that reflection is never
> clear, I am fully aware! I'm doing this to learn about reflection in Go and
> to see if Go can support a workflow something like Java's JAX-RS.
>
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