Top "Invariants" questions

In computer science, a predicate is called an invariant to a sequence of operations provided that: if the predicate is true before starting the sequence, then it is true at the end of the sequence.

What is a class invariant in Java?

I googled the topic, but besides Wikipedia I didn't find any further useful documentation or articles. Can anybody explain to …

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What are the differences pre condition ,post condition and invariant in computer terminology

I am reading the book Java Concurrency in Practice and getting a little bit confused with these terms: Pre condition …

java concurrency uml invariants
What is an invariant?

The word seems to get used in a number of contexts. The best I can figure is that they mean …

language-agnostic invariants
Set size on char array in Java

I'm developing an Android application. I want to set size to a char array like this: public char[5] language; But …

java android invariants array-initialize
What is the best way of determining a loop invariant?

When using formal aspects to create some code is there a generic method of determining a loop invariant or will …

loops invariants formal-methods loop-invariant
Loop invariant of linear search

As seen on Introduction to Algorithms (http://mitpress.mit.edu/algorithms), the exercise states the following: Input: Array A[1..n] …

algorithm invariants loop-invariant
Empty constructors and setters on JPA Entites

I don't like the requirement on have at least one empty constructor and public setters on JPA entities. While I …

jpa entity invariants
Simple examples of co and contravariance

Could someone provide me simple C# examples of convariance, contravariance, invariance and contra-invariance (if such thing exists). All samples I've …

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Using Loop invariant to prove correctness of merge sort (Initialization , Maintenance , Termination)

How would you go about proving the correctness of merge sort with reasoning over the states of loop invariants?.The …

algorithm loops sorting mergesort invariants
What is the difference between Invariants and Validation Rules?

I often see the term Invariants in DDD. Here Dino Esposito talks about it. If I look at the .NET …

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