Paraméteremelés

Paraméteremelés is a Hungarian term that translates to "parameter raising" or "parameter elevation" in English. It most commonly refers to a concept in the context of computer programming and software development, specifically related to the way functions or methods can be defined and called.

In object-oriented programming, parameter raising typically occurs when a derived class (a subclass) provides a more specific implementation of a method inherited from a base class (a superclass). The derived class's method can accept a wider range of parameter types than the base class method, effectively "raising" the allowed parameter types. This is a violation of the Liskov Substitution Principle, which states that objects of a superclass should be replaceable with objects of a subclass without altering the correctness of the program.

For example, if a base class has a method `process(object a)` and a derived class overrides it with `process(string s)`, this would be a parameter raising scenario. While seemingly allowing more flexibility, it can lead to runtime errors if the program expects an `object` but receives a `string` in a context where only an `object` is valid. Developers must be cautious when implementing parameter raising to ensure type safety and program stability. The term is less commonly used in functional programming contexts, where similar concepts might be discussed under different terminology related to type signatures and polymorphism.