在实现Clojure协议时，重载方法可以调用其重载的对应方吗？(When implementing a Clojure protocol, can an overloaded method call its overloaded counterpart?)

 这是重载协议定义的一部分： 
 
(defprotocol ClientProtocol
  (create-edge
    [this outV label inV] 
    [this outV label inV data])
 
 这是其实施的一部分： 
 
(ns bulbs.neo4jserver.client
  (:use [bulbs.base.client :only [ClientProtocol]]))

(deftype Neo4jClient [ns config]
  ClientProtocol

  (create-edge
    [this outV label inV data]
    (let [inV-uri (utils/normalize-uri (build-path neo4j-uri vertex-path inV))
          path (build-path vertex-path, outV, "relationships")
          params {:to inV-uri, :type label, :data (first data)}]
      (post config path params)))

  (create-edge
    [this outV label inV]
    ;; it doesn't like this call...
    (create-edge this outV label inV nil)) 
 
 当第二种方法尝试调用第一种方法时，它会发出此错误： 
 
java.lang.RuntimeException: Unable to resolve symbol: create-edge in this context
 
 当我使用第一个函数编译它时，我在SLIME中使用了两个定义，然后返回并添加了第二个。 
 
 但是当我将协议定义移动到一个单独的文件并尝试重新编译整个文件时，它会在第二个方法尝试调用第一个方法时抛出错误，大概是因为第一个方法尚未定义。 
 
 Clojure reify docs有这样的评论： 
 
 
 
 如果方法在协议/接口中过载，则必须提供多个独立的方法定义。 
 
 
 http://clojure.github.com/clojure/clojure.core-api.html#clojure.core/reify 
 
 我想这些不是独立的定义。 
 
 什么是正确的方法来解决这个问题？ 

Here's part of an overloaded protocol definition:
 
(defprotocol ClientProtocol
  (create-edge
    [this outV label inV] 
    [this outV label inV data])
 
And here's part of its implementation: 
 
(ns bulbs.neo4jserver.client
  (:use [bulbs.base.client :only [ClientProtocol]]))

(deftype Neo4jClient [ns config]
  ClientProtocol

  (create-edge
    [this outV label inV data]
    (let [inV-uri (utils/normalize-uri (build-path neo4j-uri vertex-path inV))
          path (build-path vertex-path, outV, "relationships")
          params {:to inV-uri, :type label, :data (first data)}]
      (post config path params)))

  (create-edge
    [this outV label inV]
    ;; it doesn't like this call...
    (create-edge this outV label inV nil)) 
 
It's spewing this error when the second method tries to call the first:
 
java.lang.RuntimeException: Unable to resolve symbol: create-edge in this context
 
I had both definitions working earlier in SLIME when I compiled it with the first function and then went back and added the second. 
 
But when I moved the protocol definition into a separate file and tried to re-compile the whole thing, it throws an error when the second method tries to call the first, presumably because the first method hasn't been defined yet.
 
The Clojure reify docs have this comment:
 
 
 
If a method is overloaded in a protocol/interface, multiple independent method definitions must be supplied.
 
 
http://clojure.github.com/clojure/clojure.core-api.html#clojure.core/reify
 
I suppose these are not independent definitions.
 
What's the right way to approach this?

原文：https://stackoverflow.com/questions/10645155