C++ 头文件和源文件之间的“类类型重定义”错误
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"Class type redefinition" error between header and source files
提问by trevwilson
So I'm having a problem which I'm sure there is an extremely obvious solution for, but I just can't seem to figure it out. Basically, when I try to do class definitions in my headers and implementation in my source files, I am getting an error saying that I am redefining my classes. Using Visual C++ 2010 Express.
所以我遇到了一个问题，我确信有一个非常明显的解决方案，但我似乎无法弄清楚。基本上，当我尝试在我的头文件中进行类定义并在我的源文件中进行实现时，我收到一条错误消息，提示我正在重新定义我的类。使用 Visual C++ 2010 Express。
Exact error: "error C2011: 'Node' : 'class' type redefinition"
确切错误：“错误 C2011：‘节点’：‘类’类型重新定义”
Example code included below:
示例代码包含在下面：
Node.h:
节点.h：
#ifndef NODE_H
#define NODE_H
#include <string>
class Node{
public:
Node();
Node* getLC();
Node* getRC();
private:
Node* leftChild;
Node* rightChild;
};
#endif
Node.cpp:
节点.cpp：
#include "Node.h"
#include <string>
using namespace std;
class Node{
Node::Node(){
leftChild = NULL;
rightChild = NULL;
}
Node* Node::getLC(){
return leftChild;
}
Node* Node::getRC(){
return rightChild;
}
}
回答by Syntactic Fructose
class Node{
Node::Node(){
leftChild = NULL;
rightChild = NULL;
}
Node* Node::getLC(){
return leftChild;
}
Node* Node::getRC(){
return rightChild;
}
}
you declare the class twice in your code, the second time being in your .cpp file. In order to write the functions for your class you would do the following
您在代码中两次声明该类，第二次是在 .cpp 文件中。为了为您的类编写函数，您将执行以下操作
Node::Node()
{
//...
}
void Node::FunctionName(Type Params)
{
//...
}
no class is required
不需要上课
回答by jpumford
You're redefining the Node class, as it is saying. The .cpp file is just for the implementation of the functions.
正如它所说，您正在重新定义 Node 类。.cpp 文件仅用于功能的实现。
//node.cpp
#include <string>
using namespace std;
Node::Node() {
//defined here
}
Node* Node::getLC() {
//defined here
}
....
