链接时未定义C虚函数 – 为什么？

我有以下课程：

template<class BufferType,class ConnectionType,class HandlerType>
class UdpConnection
{
public:
UdpConnection(size_t dispatchCount) : service(),listener(service),pool(dispatchCount),sysMsgHandlers(),bufferPool(),buffers()
    {
        assert(dispatchCount > 0);
        initBuffers(dispatchCount);
        initSysHandlers();
    }
protected:
    virtual void initSysHandlers() = 0;
}

在我的子类中：

class UdpClient : public UdpConnection<SyncBufferHandler,UdpClient,ClientNetworkHandler>
{
    protected:
        void initSysHandlers();
}

和子类源文件：

void UdpClient::initSysHandlers()
{

}

如您所见,我在构造函数中调用虚函数.据我所知,这应该没问题,因为我知道我的子类构造函数不会被调用,所以我不能使用任何实例变量,但我只是添加一些子类特定的项目到一个的std ::地图.

Linking CXX static library libnetwork.a
[ 75%] Built target network                                                                                           
Scanning dependencies of target testclient
[ 87%] Building CXX object CMakeFiles/testclient.dir/src/test/testclient.cpp.o                                        
Linking CXX executable testclient                                                                                     
src/network/libnetwork.a(udpclient.cpp.o): In function `voip::network::UdpConnection<voip::network::client::SyncBufferHandler,voip::network::client::UdpClient,voip::network::client::ClientNetworkHandler>::UdpConnection(unsigned long)':
udpclient.cpp:(.text._ZN4voip7network13UdpConnectionINS0_6client17SyncBufferHandlerENS2_9UdpClientENS2_20ClientNetworkHandlerEEC2Em[voip::network::UdpConnection<voip::network::client::SyncBufferHandler,voip::network::client::ClientNetworkHandler>::UdpConnection(unsigned long)]+0x10d): undefined reference to `voip::network::UdpConnection<voip::network::client::SyncBufferHandler,voip::network::client::ClientNetworkHandler>::initSysHandlers()'
collect2: ld returned 1 exit status

我在这做错了什么？请询问您是否需要更多信息,希望尽可能缩短！