What is an invariant class?
In object -oriented computer programming and design, the class is an invariant set of rules that can be used to define whether an instance of an object exists in a valid state. From the design point of view, the inventive class of the border set is among which the data in the object must fall to be considered the correct functional condition. The class invariant can be defined in design documentation or source code comments or in some programming languages can be directly implemented in action computer code. A program that uses coded invariants and claims may cause the program to end or cause various errors when invariant conditions are not met. Unlike standard error control, class invariants are generally used only to ensure that the internal implementation of the class works and is usually not listed in public documentation or programming interfaces.
From a very basic level, the class is an inventive class basically a collection of the class. Claim, again isDays is a statement that checks a certain part of the class state and must evaluate in order to continue the program. One example of the statement is a statement that ensures that the integer is always between 1 and 10. When the invariant class is used, the claims are evaluated for all relevant parts of the data held by the object, which basically verifies that all data in the object is in defined strains.
In many cases, the use of the Invariant Class, it strongly resembles a standard checking of errors in which variables are measured to ensure that they are at usable boundaries or are not zero. However, the difference between the use of class invariants and the standard error control is that invariants and claims are mainly used to capture errors that should not occur unless there is a fault in the code. Another difference is the ThPři Standard Error check has a tendency to include recovery and changesIn the control flow of the program, while the result of invariant failure should be the end of the program. The reason most programs end when invariant class control fails is that the object is in a compromised state and is unable to, from the design perspective, to the fulfillment of its assumptions and the post-convention necessary to comply with its draft contract.
One of the properties of the invariant class in object -oriented programming languages in which they are defined is that the mechanism inherited by any subclass is invariant. This prevents any invariant checks that are carried out in the superior class. In the end, this means that the subclass is unable to interrupt the proposal contract specified by the Super Class, which could cause unpredictable results or hard -to -reach program errors.