我正在尝试用c++编写一个2-3-4树的实现。因为已经有一段时间没有使用模板了,所以我遇到了一些错误。下面是我的极其基础的代码框架:
node.h:
主要代码文件是 main.cpp:
当我尝试从命令行编译时,使用以下命令: g++ main.cpp node.cpp TwoThreeFourTree.cpp 我得到了以下错误:
我的主要问题是它为什么说"error: ‘TwoThreeFourTree’不是一个模板"。有人有什么想法吗?提前感谢所有的建议/帮助... 丹
node.h:
#ifndef TTFNODE_H
#define TTFNODE_H
template <class T>
class TreeNode
{
private:
TreeNode();
TreeNode(T item);
T data[3];
TreeNode<T>* child[4];
friend class TwoThreeFourTree<T>;
int nodeType;
};
#endif
node.cpp:
#include "node.h"
using namespace std;
template <class T>
//default constructor
TreeNode<T>::TreeNode(){
}
template <class T>
//paramerter receving constructor
TreeNode<T>::TreeNode(T item){
data[0] = item;
nodeType = 2;
}
TwoThreeFourTree.h
#include "node.h"
#ifndef TWO_H
#define TWO_H
enum result {same, leaf,lchild,lmchild,rmchild, rchild};
template <class T> class TwoThreeFourTree
{
public:
TwoThreeFourTree();
private:
TreeNode<T> * root;
};
#endif
TwoThreeFourTree.cpp:
#include "TwoThreeFourTree.h"
#include <iostream>
#include <string>
using namespace std;
template <class T>
TwoThreeFourTree<T>::TwoThreeFourTree(){
root = NULL;
}
主要代码文件是 main.cpp:
#include "TwoThreeFourTree.h"
#include <string>
#include <iostream>
#include <fstream>
using namespace std;
int main(){
ifstream inFile;
string filename = "numbers.txt";
inFile.open (filename.c_str());
int curInt = 0;
TwoThreeFourTree <TreeNode> Tree;
while(!inFile.eof()){
inFile >> curInt;
cout << curInt << " " << endl;
}
inFile.close();
}
当我尝试从命令行编译时,使用以下命令: g++ main.cpp node.cpp TwoThreeFourTree.cpp 我得到了以下错误:
In file included from TwoThreeFourTree.h:1,
from main.cpp:1:
node.h:12: error: ‘TwoThreeFourTree’ is not a template
main.cpp: In function ‘int main()’:
main.cpp:13: error: type/value mismatch at argument 1 in template parameter list for ‘template<class T> class TwoThreeFourTree’
main.cpp:13: error: expected a type, got ‘TreeNode’
main.cpp:13: error: invalid type in declaration before ‘;’ token
In file included from node.cpp:1:
node.h:12: error: ‘TwoThreeFourTree’ is not a template
In file included from TwoThreeFourTree.h:1,
from TwoThreeFourTree.cpp:1:
node.h:12: error: ‘TwoThreeFourTree’ is not a template
我的主要问题是它为什么说"error: ‘TwoThreeFourTree’不是一个模板"。有人有什么想法吗?提前感谢所有的建议/帮助... 丹
TwoThreeFourTree<int>
应该可以访问TreeNode<int>
,但不一定能访问TreeNode<double>
。 - David Rodríguez - dribeasTwoThreeFourTree
之外,没有其他东西可以使用TreeNode
,或者应该看到它;为什么不将节点类型作为树类的私有嵌套非模板类呢? - CTMacUser