C++ 未声明标识符（但已声明？）
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C++ Undeclared Identifier (but it is declared?)
提问by Joshua
I'm pretty sure I've included the qanda class, but when I try to declare a vector that contains it or a class of that type I get an error saying that qanda is undefined. Any idea what the problem might be?
我很确定我已经包含了 qanda 类，但是当我尝试声明一个包含它的向量或该类型的类时，我收到一条错误消息，指出 qanda 未定义。知道可能是什么问题吗？
bot_manager_item.h
bot_manager_item.h
#pragma once
#include "../bot_packet/bot_packet.h"
#include <vector>
class bot_manager_item;
#include "qanda.h"
#include "bot_manager.h"
class bot_manager_item
{
public:
bot_manager_item(bot_manager* mngr, const char* name, const char* work_dir);
~bot_manager_item();
bool startup();
void cleanup();
void on_push_event(bot_exchange_format f);
bool disable;
private:
void apply_changes();
bot_manager *_mngr;
std::string _name;
std::string _work_dir;
std::string _message;
std::string _message_copy;
std::vector<qanda> games;
qanda test;
char _config_full_path[2600];
};
qanda.h
强达
#ifndef Q_AND_A
#define Q_AND_A
#include "users.h"
#include "..\bot_packet\bot_packet.h"
#include "bot_manager.h"
#include <string>
#include <algorithm>
#include <map>
#include <vector>
#include <fstream>
class qanda
{
public:
qanda(bot_manager * manager, std::string name, std::string directory);
~qanda(){};
void room_message(std::string username, std::string user_message);
void timer_tick();
private:
// data members
std::string question;
std::string answer;
std::string directory;
std::string command_prefix;
std::string name;
Users users;
std::map <std::string, std::string> questions_and_answers;
int time_per_question; // seconds
int time_between_questions; // seconds
int timer; // milliseconds
bool is_delayed;
bool is_playing;
bot_manager * manager;
// functions
void new_question();
void send_message(std::string msg);
void announce_question();
void load_questions();
};
#endif
Solved: I ended up refactoring the code in such a way as to avoid the use of bot_manager within the qanda class.
已解决：我最终以这样一种方式重构了代码，以避免在 qanda 类中使用 bot_manager。
回答by aschepler
I suspect a circular #includeproblem. Is it possible qanda.h indirectly includes bot_manager_item.h?
我怀疑是循环#include问题。qanda.h 是否有可能间接包含 bot_manager_item.h？
It looks like you may be able to reduce header dependencies by using a forward declaration
看起来您可以通过使用前向声明来减少标头依赖性
class bot_manager;
instead of #include "bot_manager.h"in one or both of your posted header files.
而不是#include "bot_manager.h"在您发布的一个或两个头文件中。
