C ++线程问题：错误：'class std :: result_of中没有名为'type'的类型

Question

我之前尝试过查看这个问题，但不幸的是，似乎没有答案。

我的错误是：

ac@universe $ g++ -std=c++14 Bot.cpp ServerSocket.cpp ../shared/Socket.cpp server.cpp 
In file included from /usr/include/c++/5.3.0/thread:39:0,
                 from server.cpp:4:
/usr/include/c++/5.3.0/functional: In instantiation of ‘struct std::_Bind_simple<void (*(ServerSocket))(ServerSocket&)>’:
/usr/include/c++/5.3.0/thread:137:59:   required from ‘std::thread::thread(_Callable&&, _Args&& ...) [with _Callable = void (&)(ServerSocket&); _Args = {ServerSocket&}]’
server.cpp:55:44:   required from here
/usr/include/c++/5.3.0/functional:1505:61: error: no type named ‘type’ in ‘class std::result_of<void (*(ServerSocket))(ServerSocket&)>’
       typedef typename result_of<_Callable(_Args...)>::type result_type;
                                                             ^
/usr/include/c++/5.3.0/functional:1526:9: error: no type named ‘type’ in ‘class std::result_of<void (*(ServerSocket))(ServerSocket&)>’
         _M_invoke(_Index_tuple<_Indices...>)
     ^

他们正在谈论的服务器代码是：

#include "ServerSocket.h"
#include "Bot.h"
#include <thread>
#include <string>
#include <vector>
#include <iterator>
#include <sstream>
#include <iostream>
#include <unordered_map>
#include "../shared/SocketException.h"

#define PORT 23700

using namespace std;

int bot_id = 0;
unordered_map<int, Bot*>botlist;

void start_bot(ServerSocket& sock){
    try{
        string data; string command;
        while(true){
            sock >> data;
            cout << "Bot reply: " << data << endl;
            cout << ">" ;
            getline(cin, command);
            sock << command;
        }
    }catch(SocketException&){}
}
//starts the server on specified address and port
void start(){
    try {
        ServerSocket server (PORT);
        while (true){
            Bot new_bot(++bot_id);
            server.accept(new_bot.socket());
            botlist.insert(make_pair(bot_id,&new_bot));
            thread newbot(start_bot,new_bot.socket());
        }
    }catch (SocketException& e){
        cout << "Socket Exception: " << e.description() << endl;
    }
}


int main(){
    start();
    return 0;
}

我认为我在做线程的根本错误。基本上，我想要做的是，无论何时客户端连接服务器（此代码），我都会启动一个新线程。 start_bot（）是被调用以为每个客户端启动新线程的函数，start（）通常在端口上启动服务器。