What does the variable $this mean in PHP?

It’s a reference to the current object, it’s most commonly used in object oriented code. Reference: http://www.php.net/manual/en/language.oop5.basic.php Primer: http://www.phpro.org/tutorials/Object-Oriented-Programming-with-PHP.html Example: This stores the ‘Jack’ string as a property of the object created.

What’s the difference between integer class and numeric class in R

There are multiple classes that are grouped together as “numeric” classes, the 2 most common of which are double (for double precision floating point numbers) and integer. R will automatically convert between the numeric classes when needed, so for the most part it does not matter to the casual user whether the number 3 is … Read more

What’s the difference between integer class and numeric class in R

There are multiple classes that are grouped together as “numeric” classes, the 2 most common of which are double (for double precision floating point numbers) and integer. R will automatically convert between the numeric classes when needed, so for the most part it does not matter to the casual user whether the number 3 is … Read more

Does C have classes?

No, C doesn’t have classes. That said, there are ways of simulating object-oriented programming in C – a quick Google search should yield some useful results.

How do you implement a class in C?

That depends on the exact “object-oriented” feature-set you want to have. If you need stuff like overloading and/or virtual methods, you probably need to include function pointers in structures: This would let you implement a class, by “inheriting” the base class, and implementing a suitable function: This of course requires you to also implement a … Read more

What is predicate in C++?

A predicate is a C++ function returning a boolean or an object having a bool operator() member. A unary predicate takes one argument, a binary takes two, and so on. Examples of questions predicates can answer for a particular algorithm are: Is this element what we are looking for? Is the first of two arguments … Read more

C++ – No appropriate default constructor available

In contrast to C#, this declaration; …is an instantiation of the type Player, which means that by the time you’re assigning it inside the constructor, it has already been constructed without a parameter. What you need to do is to tell the class how to initialize player in what is called an initializer list that you append to the constructor … Read more