使用带有 ref 参数的成员函数创建线程时出现编译错误

Question

im 试图做一个 std：：tread 所以我已经看了一些教程，但是当我做同样的事情(我认为(它不会编译。

这是我Network_类，"receiveFromServer"成员函数应该是线程函数。

class Network_ {
public:
bool errorInfo(sf::Socket::Status status) {
switch (status)
{
case sf::Socket::Done:
return true;
break;
case sf::Socket::NotReady:
std::cout << "The socket is not ready to send / receive data yet." << std::endl;
return false;
break;
case sf::Socket::Partial:
std::cout << "The socket sent a part of the data." << std::endl;
return false;
break;
case sf::Socket::Disconnected:
std::cout << "The socket has been disconnected." << std::endl;
return false;
break;
case sf::Socket::Error:
std::cout << "An unexpected error happened." << std::endl;
return false;
break;
default:
return false;
break;
}
}
void receiveFromServer(sf::RenderWindow &RW) {
sf::Packet packet;
std::string string;
while (RW.isOpen())
if (_selector.wait() && _selector.isReady(_socket)) {
if (errorInfo(_socket.receive(packet))) {
packet >> string;
packet.clear();
std::cout << string << std::endl;
}
}
else
RW.close();
}
private:
sf::SocketSelector _selector;
sf::TcpSocket _socket;

这是我主要的一部分

Network_ network;
if (network.connectToServer(ip, port)) {
Window_ window;
sf::RenderWindow *RW = window.create_window("test", 10);
std::thread receiveThread(&Network_::receiveFromServer, &network, std::ref(RW));
return gameLoop(*RW);
}

我得到了这个错误static assertion failed: std::thread arguments must be invocable after conversion to rvalues下面有很多sh*t。

有人可以帮我吗？谢谢:)

Answer 1

您的receiveFromServer函数需要对sf::RenderWindow的引用，但您传递的是sf::RenderWindow*&。

这里有几种解决方案。

按值传递，因为它只是一个指针

void receiveFromServer(sf::RenderWindow* RW) // sf::RenderWindow* instead of sf::RenderWidnow&
{ /* ... */}
std::thread receiveThread(&Network_::receiveFromServer, &network, RW); // pass by value

通过引用传递 - 毫无用处

void receiveFromServer(sf::RenderWindow*& RW) // sf::RenderWindow*& instead of sf::RenderWidnow&
{ /* ... */}
std::thread receiveThread(&Network_::receiveFromServer, &network, std::ref(RW)); // pass by reference

在不更改函数的情况下通过引用传递

void receiveFromServer(sf::RenderWindow& RW) // no change
{ /* ... */}
std::thread receiveThread(&Network_::receiveFromServer, &network, std::ref(*RW)); // dereference and pass by reference