go - TypeOf without an instance and passing result to a func

Question

Is it possible in go to get a "Type" without an instance? I've seen some examples that utilize reflect.TypeOf() but they all deal with an instance.

Below is a snippet of what I am attempting to do:

import (
    "net/http"
)

type ParamReader struct {
    // The request from which to extract parameters
    context *http.Request
}

// Initialize the ParamReader with a specific http request. This serves
// as the 'context' of our param reader. All subsequent calls will validate
// the params that are present on this assigned http.Request
func (p *ParamReader) Context(r *http.Request) {
    p.context = r
}

// Validate that a given param 's' is both present and a valid
// value of type 't'. A value is demeed valid if a conversion from 
// its string representation to 't' is possible
func(p *ParamReader) Require(s string, t Type) {
    // if context not have 's'
    //      addError('s' is not present)
    //      return


    if( t == typeof(uint64)) {
        // If not s -> uint64
        //      addError('s' is not a valid uint64)
    } else if (t == typeof(uint32)) {
        // ....
    } / ....
}

An example of my usage would be

func (h *Handler) OnRequest(r *http.Request) {
  h.ParamReader.Context(r)
  h.ParamReader.Require("age", uint16)
  h.ParamReader.Require("name", string)
  h.ParamReader.Require("coolfactor", uint64)
  h.ParamReader.Optional("email", string, "unspecified")
  h.ParamReader.Optional("money", uint64, "0")

  if h.ParamReader.HasErrors() {
    // Iterate or do something about the errors
  } else {
    coolness := h.ParamReader.ReadUint64("coolfactor")
    email := h.ParamReader.ReadString("email")
    money := h.ParamReader.ReadUint64(0)
  }
}

Note, after writing this out, I realize I could provide a "RequireUint64", "RequireUint32", etc.. perhaps that would be the Go way?

Answer 1

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