Qt and std::bind

Question

我试图在Qt 5.1和MSVC 2010中使用std:：bind将QNetworkReply事件挂接到成员函数，同时将回复作为参数传递。在MSVC 2010上，直接将std:：bind放入连接行失败，会出现大量模板错误，但使用std:：函数将其拆分为两行是可行的。我愿意坚持一句话。让这一切发生的魔法咒语是什么？

void MyClass::doRequest ( )
{
    ..
    QNetworkReply * reply = nam.get(...)
    // next line fails on MSVC 2010
    connect(reply, &QNetworkReply::finished, std::bind(&MyClass::onNetworkDone, this, reply));
    // next two lines do work on MSVC 2010  
    std::function<void ()> a = std::bind<void()>(&MyClass::onNetworkDone, this, reply);
    connect(reply, &QNetworkReply::finished, a);
}
void MyClass::onNetworkDone( QNetworkReply * reply )
{
    ..
}

Answer 1

您需要使用将绑定强制转换为函数指针

connect(reply, &QNetworkReply::finished, (void(*)()) std::bind(&MyClass::onNetworkDone, this, reply));

这回答了你的问题。然而，我不确定它是否会在运行时崩溃，原因在上面的评论中讨论过。