All Questions

I have a function template f, defining in its body a local class A with another nested class B. Both classes are not templates. Must I name the inner class as typename A::B or shorter variant A::B is ...

Any C++ class can be first forward declared, and defined only later in the program. Are function-local classes an exception from this rule? Please consider a simplified program: auto f() { struct ...

In C++, forward declarations introduce an incomplete type. Incomplete types can be used to declare pointers, but they cannot be used to initialize values or access members because the complete ...

What is the main difference between an inner class and a static nested class in Java? Does design / implementation play a role in choosing one of these?

I'm trying to make a Tetris game and I'm getting the compiler error when I try to create an object Shape is not an enclosing class public class Test { public static void main(String[] args) { ...

I'm playing with lambdas in Java 8 and I came across warning local variables referenced from a lambda expression must be final or effectively final. I know that when I use variables inside anonymous ...

I have the following code: class Hello { class Thing { public int size; Thing() { size = 0; } } public static void main(String[] args) { ...

Can nested classes or anonymous classes extend a class or implement an interface in Java? If so, are there any limitations or things I should be aware of? I'm not very familiar with nested classes, ...

Can someone please point me towards some nice resources for understanding and using nested classes? I have some material like Programming Principles and things like this IBM Knowledge Center - Nested ...

What is the difference between static and non-static nested class?

I have a situation like so... class Outer(object): def some_method(self): # do something class Inner(object): def __init__(self): self.Outer.some_method() # &...

I have been reading some articles on memory leaks in Android and watched this interesting video from Google I/O on the subject. Still, I don't fully understand the concept, and especially when it is ...

I have a nested class that uses static vars to have class wide parameters and accumulators. If I do it as a standalone class it works. If I do a nested class and inherit the standalone class, it works....

I have the following code. I want to get hold of the outer class object using which I created the inner class object inner. How can I do it? public class OuterClass { public class InnerClass { ...

I'd like to create a User Class for my new website. However, this time, I was thinking of creating it a little bit differently... Java, C++, and even Ruby (and probably other programming languages) ...