Trouble joining a class? I forgot or lost the class code To join a class, you just need to enter the class code once. After you join, you don’t need to enter the code again. If you forget, lose, or delete the code before you join the class, ask your teacher to share it with you.
A class is a blueprint which you use to create objects. An object is an instance of a class - it's a concrete 'thing' that you made using a specific class. So, 'object' and 'instance' are the same thing, but the word 'instance' indicates the relationship of an object to its class. This is easy to understand if you look at an example. For example, suppose you have a class House. Your own house ...
The div[class^="something"] { } "starts with" selector only works if the element contains one single class, or if multiple, when that class is the first one on the left.
Class variable is an attribute defined in a class of which a single copy exists, regardless of how many instances of the class exist. So all instances of that class share its value as well as its declaration. Field is a language-specific term for instance variable, that is, an attribute whose value is specific to each object.
For naming template parameters, typename and class are equivalent. §14.1.2: There is no semantic difference between class and typename in a template-parameter. typename however is possible in another context when using templates - to hint at the compiler that you are referring to a dependent type. §14.6.2: A name used in a template declaration or definition and that is dependent on a ...
A good use of a static class is in defining one-off, utility and/or library classes where instantiation would not make sense. A great example is the Math class that contains some mathematical constants such as PI and E and simply provides mathematical calculations. Requiring instantiation in such a case would be unnecessary and confusing.
