Question

所以目前我正在尝试在<translator>类中运行一个方法，方法是从main.cpp传递一个<bintree>类的实例。以下是我的代码，错误是我在底部收到的。我确定我只是错过了传递参数的一些方面，但对于我的生活，我无法弄明白。

main.cpp（它创建bintree的区域和传递的位置）底线最相关

if (validFile == true)
{
  //Create bintree through insert. Rebalance follows
  bintree<morseNode> morseTree;
  for (int count = 0; count < 26; count++)
  {
     char letter = morseCodes[count].letter;
     string code = morseCodes[count].code;
     morseNode node;
     node.letter = letter;
     node.code = code;
     morseTree.insert(node);
  }
  morseTree.rebalance();     
  translator fileTranslator(outputFile);//create instance of translator

  //Read and translate files based on conversion type
  if (translatorType != "e" || translatorType != "E") //English -> Morse Conversion
  {
     validFile = readFile(inputFile, translatorType, morseCodes, inputList);
     if (validFile == true)
     {
        fileTranslator.engToMorseTranslation(inputList, morseCodes);
     }
  }
  else //Morse -> English Conversion
  {
     validFile = readFile(inputFile, translatorType, morseCodes, inputList);
     if (validFile == true)
     {
        fileTranslator.morseToEngTranslation(inputList, morseTree);
        //Here is where it sends morseTree that is throwing ^^ the error.
     }
  }

我通过translator.h接收它（编辑：它知道morseNode的功能）

#ifndef TRANSLATOR_H
#define TRANSLATOR_H

#include <string>
#include <iostream>
#include <list>

//I tried #include "bintree.h" here. this did not work

using namespace std;

class translator
{
private:
  string outName;
  list<char> morseOutput;
public:
  void morseToEngTranslation(list<char> &myList,  bintree<morseNode> &myTree)
{
    //functions here.. seemed irrelevant as i just wanted to show how i am
    //receiving the parameters
}
};
#endif

bintree不是我的，它是提供的。起始声明如下。它很长，而且函数本身对于这个问题并不重要，所以我不会包含它们。

#ifndef BINTREE_H_
#define BINTREE_H_

#include <stdexcept>

namespace treespc
{
   // forward class declaration
   template <typename dataType> class bintree;
   template <typename dataType> class binnode;

   #include "const_iterator.h"
   #include "binnode.h"

   /********************************************************\
      template class for a binary tree
   \********************************************************/

   template <typename dataType> class bintree
   {
       public:
       //....

       private:
       //....
    };
}

我收到的错误是：

translator.h:79:52: error: ‘bintree’ has not been declared
    void morseToEngTranslation(list<char> &myList,  bintree<morseNode> &myTree)



translator.h:79:59: error: expected ‘,’ or ‘...’ before ‘<’ token
    void morseToEngTranslation(list<char> &myList,  bintree<morseNode> &myTree)

提前感谢任何能够指出我正确方向的人：）

Answer 1

使用using namespace treespec或treespc::bintree

为bintree命名空间

#ifndef TRANSLATOR_H
#define TRANSLATOR_H

#include <string>
#include <iostream>
#include <list>

#include "bintree.h"

using namespace std;

class translator
{
private:
  string outName;
  list<char> morseOutput;
public:
  void morseToEngTranslation(list<char> &myList,  treespc::bintree<morseNode> &myTree)
{
    //functions here.. seemed irrelevant as i just wanted to show how i am
    //receiving the parameters
}
};
#endif

Answer 2

ifndef BINTREE_H_
#define BINTREE_H_

你在这里错过#吗？

更新：您必须包含bintree标头或使用前向声明（小心，因为您的类在命名空间内）请参阅此处的答案：Why can't I forward-declare a class in a namespace like this?

c ++'class'尚未声明 - 将类传递给类

2 个答案: