尚未声明 C++ 'class' - 将类传递给类

c++ 'class' has not been declared - passing a class to a class

本文关键字：class 未声明 C++      更新时间：2023-10-16

所以目前我正在尝试在<translator>类中运行一个方法，方法是从我的 main.cpp 向它传递一个<bintree>类的实例。以下是我的代码，我在底部收到错误。我确定我只是缺少传递参数的某些方面，但对于我的生活，我无法弄清楚。

主线.cpp（它创建bintree和传递的区域）最相关的底线

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的常量）

#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

宾特里不是我的，它是提供的。 起始声明如下。它很长，函数本身对这个问题并不重要，所以我不会包括它们。

#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)

提前感谢任何至少能为我指出正确方向的人:)

使用 using namespace treespec 或 treespc::bintree 给出 bintree 的命名空间 

#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

ifndef BINTREE_H_
#define BINTREE_H_

你在这里错过了#吗？

更新：您必须包含bintree标头或使用前向声明（请注意，因为您的类在命名空间内）请参阅此处的答案：为什么我不能在这样的命名空间中向前声明一个类？

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