private-members

This question already has an answer here: How do I test a private function or a class that has private methods, fields or inner classes? 50 answers I am very new to unit testing and I am a little confused. I am trying to do unit testing (using the Boost unit testing framework) on a C++ class called VariableImpl . Here are the details. class Variable { public: void UpdateStatistics (void) { // compute mean based on m_val and update m_mean; OtherClass::SendData (m_mean); m_val.clear (); } virtual void RecordData (double) = 0; protected: std::vector<double> m_val; private: double m_mean; }; class

I have been reading a lot of tutorials on C++ class but they miss something that other tutorials include. Can someone please show me how to write and use a very simple C++ class that uses visibility, methods and a simple constructor and destructor? TStamper Well documented example taken and explained better from Constructors and Destructors in C++ : #include <iostream> // for cout and cin class Cat // begin declaration of the class { public: // begin public section Cat(int initialAge); // constructor Cat(const Cat& copy_from); //copy constructor Cat& operator=(const Cat& copy_from); //copy

Does somebody know how to make private, non-static members in CoffeeScript? Currently I'm doing this, which just uses a public variable starting with an underscore to clarify that it shouldn't be used outside of the class: class Thing extends EventEmitter constructor: (@_name) -> getName: -> @_name Putting the variable in the class makes it a static member, but how can I make it non-static? Is it even possible without getting "fancy"? Is it even possible without getting "fancy"? Sad to say, you'd have to be fancy . class Thing extends EventEmitter constructor: (name) -> @getName = -> name

EDIT: I figured it out from Bergi's answer in the end. Thanks Bergi. pubPrivExample = (function () { return { init : function () { var private; this.setPrivate = function (p) { private = p; }; this.getPrivate = function () { return private; }; }, public : "This is public\n" }; }()); var a; a = Object.create(pubPrivExample); a.init(); a.setPrivate("This is private"); document.write(a.getPrivate()); EDIT: It seems the answers to my question are off at a tangent. I'm really not interested in a factory and actually would rather not use if. My question is about private state. From Bergi's answers

Consider this example : import java.lang.reflect.Field; public class Test { public static void main(String[] args) { C c = new C(); try { Field f = C.class.getDeclaredField("a"); f.setAccessible(true); Integer i = (Integer)f.get(c); System.out.println(i); } catch (Exception e) {} } } class C { private Integer a =6; } It seems illogical that you are allowed to access private fields of classes with reflection. Why is such a functionality available? Isn't it "dangerous" to allow such access? Private is intended to prevent accidental misuse, not as a security mechanism. If you choose to bypass it