CODEWITHSUNDEEP
qtqt5qnetworkaccessmanagervisual-studio-2010stdbind
user815719
user815719

Reputation: 43

Qt and std::bind

I'm trying to use std::bind in Qt 5.1 and MSVC 2010 to hook a QNetworkReply event to a member function while passing the reply as a parameter. Directly putting the std::bind in the connect line fails with a ton of template errors on MSVC 2010 but splitting this into two lines by using std::function works. I'd love to stick with one line. What is the magic incantation to make this happen?

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 )
{
    ..
}

Upvotes: 3

Views: 3777

Answers (1)

galinette
galinette

Reputation: 9292

You need to cast the bind to a function pointer with:

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

This answers your question. However, I'm not sure it won't crash at runtime, for the reason discussed in the above comment.

Upvotes: 2

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