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How to set metadaType in two class


How to set metadaType in two class

By : Michael Coene
Date : November 22 2020, 12:01 PM
will help you i have a class the sales and product, which have the same declaration of object, these two class is auto generated by the server, all i want is set the annotation of them so that it can be reusable all the time, how can i set the MetadataType of this two into one, , Add the MetadataType to the other class...
code :
namespace Validation.Access
{
    [MetadataType(typeof(TransferModuleValidation))]
    public partial class Sales { }

    [MetadataType(typeof(TransferModuleValidation))]
    public partial class Product { }

    public partial class TransferModuleValidation
    {
        [MaxLength(3, ErrorMessage = "Must be less than or 3 characters")]
        public string Currency { get; set; 
    }
}


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How to access a data class's private member variable from another derived class whose parent class is a friend class of

How to access a data class's private member variable from another derived class whose parent class is a friend class of


By : Warren Chin
Date : March 29 2020, 07:55 AM
it helps some times Since you have declared struct PImpl in the private part of CDataHolder class, only friends of CDataHolder can access the same. Why don't you put a forward declaration struct PImpl in the public section or even better before the CDataHolder class?
Initializing a class; Instead of passing required class as argument, pass a base class of that expected class

Initializing a class; Instead of passing required class as argument, pass a base class of that expected class


By : Kamlesh Nayak
Date : March 29 2020, 07:55 AM
wish of those help This is the basis of polymorphism. Wherever you have something that expects an s_api * (i.e. a pointer to base class), you are free to pass a Tvalue * (i.e. a pointer to derived class).
Turning a BOUNDED std::list<class> of parameters into a type std::tuple<class,class,class> tup<classObj1,

Turning a BOUNDED std::list<class> of parameters into a type std::tuple<class,class,class> tup<classObj1,


By : user3213521
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further This code works correctly on clang and g++ (using C++11):
http://coliru.stacked-crooked.com/a/c8071ab447e10a31
code :
#include <tuple>
#include <type_traits>
#include <list>
#include <iostream>
#include <typeinfo>

template<std::size_t Max_N, typename List>
class list_to_tuple {
public:
    using value_type = typename List::value_type;
    using iterator_type = typename List::const_iterator;
    using tuple_type = decltype(std::tuple_cat(
        std::tuple<typename List::value_type>(),
        typename list_to_tuple<Max_N-1, List>::tuple_type()
    ));

    tuple_type operator()(const List& lst, const value_type& sentinel) {
        return convert(lst.begin(), lst.end(), sentinel);
    }

    tuple_type convert(iterator_type begin, iterator_type end, const value_type& sentinel) const {
        list_to_tuple<Max_N-1, List> remaining;
        if(begin != end) {
            auto current = std::make_tuple(*begin);
            ++begin;
            return std::tuple_cat(current, remaining.convert(begin, end, sentinel));
        } else {
            return std::tuple_cat(std::make_tuple(sentinel), remaining.convert(begin, end, sentinel));
        }
    }
};

template<typename List>
class list_to_tuple<0, List> {
public:
    using value_type = typename List::value_type;
    using iterator_type = typename List::const_iterator;
    using tuple_type = std::tuple<>;

    tuple_type convert(iterator_type begin, iterator_type end, const value_type& sentinel) const {
        return std::tuple<>();
    }
};

int main() {
    std::list<int> lst = {1, 2, 3};
    list_to_tuple<5, std::list<int>> to_tup;
    auto tup = to_tup(lst, 0);
    std::cout << std::get<0>(tup) << std::endl;
    std::cout << std::get<1>(tup) << std::endl;
    std::cout << std::get<2>(tup) << std::endl;
    std::cout << std::get<3>(tup) << std::endl;
    std::cout << std::get<4>(tup) << std::endl;
    std::cout << typeid(tup).name() << std::endl;
}
If an instance of class B is a member of class A, how can class B call a method of class A when a button in class B is p

If an instance of class B is a member of class A, how can class B call a method of class A when a button in class B is p


By : Jared Ondimu
Date : March 29 2020, 07:55 AM
this will help Your immediate objective is to invoke update on an instance of Controller within the actionPerformed method of an anonymously implemented ActionListener within ControlPanelOne's constructor. ControlPanelOne is composed within the constructor of an instance of Controller. Effectively, you need a circular reference from Controller to ControlPanelOne and visa versa.
Here's a straight forward approach. You can check out the minimally worked out project here.
code :
public class Controller {

    private Model m; //class Model not shown
    private Viewer v; //class Viewer not shown
    private JFrame frame;
    private ControlPanelOne cpo;
    private ControlPanelTwo cpt; //class ControlPanelTwo not shown

    public Controller() {
        m = new Model();
        v = new Viewer();
        frame = new JFrame();
        frame.setLayeredPane(null); // Do something

        cpo = new ControlPanelOne(this); // Supply self to the instance of ControlPanelOne
        cpt = new ControlPanelTwo();

        frame.add(cpo.getPanel());
        frame.add(cpt.getPanel());
    }

    public void update() {
        m.update();
        v.update();
    }
}
public class ControlPanelOne {

    private JPanel panel;
    private JButton button;

    public ControlPanelOne(final Controller controller){
        panel = new JPanel();
        button = new JButton("press me");
        panel.add(button);
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //do some stuff;

                controller.update();

            }
        });
    }


    public Component getPanel() {
        return null;
    }
}
GroovyCastException: Cannot cast object 'class com.jcraft.jsch.ChannelExec' with class 'java.lang.Class' to class

GroovyCastException: Cannot cast object 'class com.jcraft.jsch.ChannelExec' with class 'java.lang.Class' to class


By : Maniacks
Date : March 29 2020, 07:55 AM
like below fixes the issue I am trying to connect a linux machine and executing my shell script named as "myscript.sh". While running it, I am getting cast exception while same is working fine in Java. , The problem is here
code :
ChannelExec channelExec = (ChannelExec) 
session.openChannel("exec");
ChannelExec channelExec = (ChannelExec.class);
session.openChannel("exec");
ChannelExec channelExec = (ChannelExec) session.openChannel("exec")
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