我正在运行运行自定义网络服务器的程序，该服务器应输出一些活动的HTML内容：
// This is the webserver library...
class myWebServer
{
public:
myWebServer() {}
~myWebServer() {}
// ...
void sendPageToClient()
{
// ... "client" is the TCP socket
// ... "html" should contain the output of myMainProgram::ProcessASP
client->send(html);
}
void runServer()
{
while (1)
{
// listens to TCP socket
client->listen();
// receive query from browser
// send HTML using sendPageToClient()
// ...
sendPageToClient();
}
}
};
// This is the main program class...
class myMainProgram
{
public:
myMainProgram() {}
~myMainProgram() {}
// ...
string ProcessASP(string query)
{
return
"<html>The query string you have passed contains:<br>"
+ query +
"</html>";
}
void runProgram()
{
// do something
}
};
// This is a multi-threaded application
void main()
{
myMainProgram myProgram;
myWebServer myServer;
myProgram.runProgram();
myServer.runServer();
};
我该如何设置一个回调函数，该回调函数从类中myWebServer调用myMainProgram::ProcessASP传递参数并接收其输出？
您可能要使用std::function<std::string(std::string)>：
class myWebServer {
// not really a "callback"?
std::function<std::string(std::string)> callback;
public:
template <typename F>
void setCallback(F&& f) { callback = std::forward<F>(f); }
void runServer() {
// ...
std::string foo = callback("hello");
// do something with foo
}
};
然后，您可以执行以下操作：
myServer.setCallback([&](std::string query){
return myProgram.ProcessASP(query);
});
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