Error: any_cast<T>(any&&) broken on Windows but works in Linux

Question

First of all, I'm a C++ novice so be gentle. In my cross-platform project I've run into an issue I can't sort out using VS Studio 2019 via the nar builder in Maven. The build works a-ok on Linux, but on Windows 10 x64 the build fails here:

[ERROR] OUTPUT>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\include\any(429): error C2338: any_cast<T>(any&&) requires T to be constructible from remove_cv_t<remove_reference_t<T>>
[INFO] OUTPUT>c++/SRTServer.cpp(188): note: see reference to function template instantiation '_Ty &std::any_cast<std::shared_ptr<NetworkConnection>&>(std::any &&)' being compiled
[INFO] OUTPUT>        with
[INFO] OUTPUT>        [
[INFO] OUTPUT>            _Ty=std::shared_ptr<NetworkConnection> &
[INFO] OUTPUT>        ]

The NetworkConnection is in an included h file and consists of

class NetworkConnection {
public:
    NetworkConnection();
    virtual ~NetworkConnection();
    std::any object;
    uint16_t connectorId;
};

Lines 183-193 of SRTServer.cpp

void gotData(ElasticFrameProtocol::pFramePtr &rPacket) {
    std::cout << "Got NAL-units of size " << unsigned(rPacket->mFrameSize) <<
                " pts " << unsigned(rPacket->mPts) << " is broken? " << rPacket->mBroken << 
                " from EFP connection " << unsigned(rPacket->mSource) << std::endl;
    // TODO the NetworkConnection must be looked up to get the server id and client id
    auto nc = std::any_cast<std::shared_ptr<NetworkConnection> &>(rPacket->mSource); // the source being a NetworkConnection is a guess right now
    // get the client from the network connection
    auto client = std::any_cast<std::shared_ptr<Client> &>(nc->object);
    // call the receive method
    recvData(rPacket->pFrameData, rPacket->mFrameSize, client->serverId, client->connectorId, rPacket->mStream);
}

Answer 1

As mentioned in the comments the casting of mSource (uint8_t) to a NetworkConnection (Class) will fail. And as you say -> // the source being a NetworkConnection is a guess right now .

There is probably another part of the code where you should do the casting. If more code is provided then we can help.

/Anders