How to check variable type at runtime in Go language

Question

I have few C functions declared like this

CURLcode curl_wrapper_easy_setopt_long(CURL* curl, CURLoption option, long param); CURLcode curl_wrapper_easy_setopt_str(CURL* curl, CURLoption option, char* param); 

I would like to expose those as one Go function like this

func (e *Easy)SetOption(option Option, param interface{}) 

so I need to be able to check param type at runtime. How do I do that and is this good idea (if not what is good practice in this case)?

Answer 1

It seems that Go have special form of switch dedicate to this (it is called type switch):

func (e *Easy)SetOption(option Option, param interface{}) {      switch v := param.(type) {      default:         fmt.Printf("unexpected type %T", v)     case uint64:         e.code = Code(C.curl_wrapper_easy_setopt_long(e.curl, C.CURLoption(option), C.long(v)))     case string:         e.code = Code(C.curl_wrapper_easy_setopt_str(e.curl, C.CURLoption(option), C.CString(v)))     }  }