枚举尚未声明

Enum has not been declared

本文关键字：未声明 枚举      更新时间：2023-10-16

我使用以下标头Node.h：

/*
    INCLUDE PROTECTION
*/
#ifndef NODE_H_INCLUDED
#define NODE_H_INCLUDED
/*
    Include
*/
#include <vector>
#include <unordered_map>
//#include "NodeConnection.h"
#include "Tile.h"
#include "Network.h"
/*
    Declarations
*/
class Network;
class NodeConnection;
class Node {
    private:
        Tile* tile;
        std :: vector <NodeConnection*> connections;
        std :: unordered_map <Node*, NodeConnection*> connectionmap;
    public:
        /* Enumeration */
        enum NAVIGATION {
            RIGHT = 0, 
            UP = 1, 
            LEFT = 2, 
            DOWN = 3
        };
        Node (Tile* _tile);
        void FindNeighbours(Board* board, Network* network);
        void SetNodeConnection(Node* node, NodeConnection* nodeconnection);
};
struct TileNavigation {
    Tile* tile;
    enum Node :: NAVIGATION navigation;
};
#endif

在NodeConnection.h的标题中以下内容：

/*
    INCLUDE PROTECTION
*/
#ifndef NODECONNECTION_H_INCLUDED
#define NODECONNECTION_H_INCLUDED
/*
    Include
*/
#include <string>
#include "Node.h"
/*
    Declarations
*/
class Node;
struct Nodes;

enum ConnectionType {
    WALLCONN, PATHCONN, UNKNOWN
};
class NodeConnection {
    private:
        enum ConnectionType contype;
        struct Nodes;
    public:
        //NodeConnection ();
        NodeConnection (Node* a, Node* b,  NAVIGATION initial_nav);
};
struct Nodes {
    Node* left;
    Node* right;
    std :: string steps;
};
#endif

我已经尝试过Node :: NAVIGATION和NAVIGATION，但它一直告诉我 

"   'NAVIGATION' has not been declared   "

有谁知道我做错了什么？提前感谢您的指点。

你有circuit-include问题。 Node.h和NodeConnection.h相互包容。

要修复：

在Node.h中向前声明Nodeconnection，从 Node.h 中删除#include "NodeConnection.h"以解决circuit-including问题。 

//#include "NodeConnection.h"  // 
class Network;
class NetworkConnection; // forward declare NetworkConnection
class Node {
//..
};

在 Node.cpp 文件中包含NodeConnection.h。

#include "NodeConnection.h"

在 NodeConnection.h 中使用Node::NAVIGATION

class NodeConnection {
private:
    //enum ConnectionType contype;  don't need to use enum keyword again.
    ConnectionType contype;
public:
    //NodeConnection ();
    NodeConnection (Node* a, Node* b,  Node::NAVIGATION initial_nav);

};

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