[英]C++ Event Handling - issue with const
我已經問過我的問題,現在我要進行下一步。 在下面的代碼中,我遇到了問題,我總是必須使EventHandler(Server :: HandleMessage)保持靜態。 但是我需要使它是非靜態的,以便從Handler中訪問Server類中的其他變量。
我該如何實現?
這是我的代碼:
#include <iostream>
#include <functional>
using namespace std;
class Client{
public:
struct MessageReceiveArgs {
MessageReceiveArgs(int ID, const std::string& Text) : ID(ID), Text(Text) {}
int ID;
std::string Text;
};
std::function<void(MessageReceiveArgs)> onMessageReceive;
Client(){}
void FireEvent(){
this->onMessageReceive(MessageReceiveArgs(16, "SomeText"));
}
};
class Server{
public:
int i;
Server(){
this->client.onMessageReceive = &Server::HandleMessage;
this->i = 5;
}
void FireEvent(){
this->client.FireEvent();
}
Client client;
static void HandleMessage(Client::MessageReceiveArgs args) {
std::cout<<"ID "<<args.ID<<": "<<" "<<args.Text<<std::endl;
//need it non static
//std::cout<<"I: "<<this->i<<std::endl;
}
};
int main() {
Server sv = Server();
sv.FireEvent();
}
如我之前的文章中所述,我是Standard C ++(Unix)的新手。
我相當確定這是您的追求。 您需要綁定隱含this
明確通過調用指針到成員時std::function
在你似乎渴望時尚。
#include <iostream>
#include <functional>
using namespace std;
class Client{
public:
struct MessageReceiveArgs
{
MessageReceiveArgs(int ID, const std::string& Text)
: ID(ID), Text(Text) {}
int ID;
std::string Text;
};
Client(){}
void FireEvent()
{
this->onMessageReceive(MessageReceiveArgs(16, "SomeText"));
}
std::function<void(MessageReceiveArgs)> onMessageReceive;
};
class Server
{
public:
int i;
Server()
{
this->client.onMessageReceive
= std::bind(&Server::HandleMessage, this, std::placeholders::_1);
this->i = 5;
}
void FireEvent()
{
this->client.FireEvent();
}
Client client;
void HandleMessage(Client::MessageReceiveArgs args)
{
std::cout<<"ID "<<args.ID<<": "<<" "<<args.Text<<std::endl;
}
};
int main()
{
Server sv = Server();
sv.FireEvent();
}
產量
ID 16: SomeText
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