nested-class

This question already has an answer here: Static nested class in Java, why? 13 answers In most of the cases I've seen that nested classes are static . Lets take an example of Entry class in HashMap static class Entry<K,V> implements Map.Entry<K,V> { final K key; V value; Entry<K,V> next; final int hash; ..... ..... } Or Entry class of LinkedList private static class Entry<E> { E element; Entry<E> next; Entry<E> previous; ..... ..... } What I know so far about nested class is: - A non-static nested class has full access to the members of the class within which it is nested. - A static nested

I am getting the following error when my application runs: System.InvalidOperationException: The type 'ContactModels+Contact' was not mapped. Check that the type has not been explicitly excluded by using the Ignore method or NotMappedAttribute data annotation. Verify that the type was defined as a class, is not primitive, nested or generic, and does not inherit from EntityObject. It is failing when my DBContext class tries to initialize the entities: public class DB : DbContext { public DbSet<ContactModels.Contact> Contacts { get; set; } .... } The Contact model is as follows: public class

C++ How can I put the definition of an inner (nested) class outside its outer (enclosing) class's definition, where the outer class has at least one instance of the inner class as a data member? I searched but the most relevant SO answer I found, Nested Class Definition in source file , does not have an example where the outer class has an inner object as a data member. I followed that answer, as far as declaring but not defining the inner class inside the outer class's definition is concerned, but my code is still broken: struct Outer { struct Inner; Inner myinner; Outer() : myinner(2) {} };

I have a question for you linq experts out there! In a nested list of Component instances, I need to know if there is a component of a particular type in it. Can it be expressed by linq? Take into account that there may be application.Components[0].Components[0].Components[0]... My question is oriented to recursive queries in linq! I leave you the entities for you to have some idea of the model. public class Application { public List<Component> Components { get; set; } } public class Component { public ComponentType Type { get; set; } public List<Component> Components { get; set; } } public

How one can overload an operator<< for a nested private class like this one? class outer { private: class nested { friend ostream& operator<<(ostream& os, const nested& a); }; // ... }; When trying outside of outer class compiler complains about privacy: error: ‘class outer::nested’ is private You could make the operator<< a friend of outer as well. Or you could implement it completely inline in nested , e.g.: class Outer { class Inner { friend std::ostream& operator<<( std::ostream& dest, Inner const& obj ) { obj.print( dest ); return dest; } // ... // don't forget to define print (which

I have a class MyClass and an inner class MyNestedClass like this: public class MyClass { ... public class MyNestedClass { ... } } Both classes are very long. Because of that i'd like to seperate them in two different files, without breaking the hierarchy. This is because the nested class shouldn't be visible to the programmer who uses MyClass. Is there a way to achieve that? You can make the inner class package private which means that it will only be accessible from other classes in exactly the same package. This is also done quite frequently for hidden classes inside the standard JDK

I'll start with some code: class myNonPODClass { public: virtual ~myNonPODClass() {} class { public: myNonPODClass* GetContainer() { return (myNonPODClass*)((int8_t*)(this) - offsetof(myNonPODClass, member)); } } member; }; Obviously, this is a contrived example. The code compiles fine, but I'm worried about the "Offset of on non-POD type 'myNonPODClass'". Is there a better way to do essentially the same thing WITHOUT having to pass the myNonPODClass pointer into the nested anonymous classes constructor (or similar)? "member" must be ready to go without any initialization. Is it possible?