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3
votes
4answers
163 views

How to refactor my project to have less mutable objects? [duplicate]

There seems to be a trend towards immutable objects, and functional programming. I recently got aware about the benefits of immutability. However, I am not very familiar with this style of ...
49
votes
8answers
4k views

Is immutability very worthwhile when there is no concurrency?

It seems that thread-safety is always/often mentioned as the main benefit of using immutable types and especially collections. I have a situation where I would like to make sure that a method will ...
0
votes
1answer
76 views

Is it a bad idea to use mutable for pre-allocated temporaries?

Let us assume I have the following C++ class: class MyFastMessageEncoder { public: MyFastMessageEncoder() : m_fieldEncoder(ENCODING_STYLE_DEFAULT) { } void ...
4
votes
2answers
459 views

Overriding GetHashCode in a mutable struct - What NOT to do?

I am using the XNA Framework to make a learning project. It has a Point struct which exposes an X and Y value; for the purpose of optimization, it breaks the rules for proper struct design, since its ...
2
votes
2answers
151 views

Why must essential mutable derived data have an inverse function?

I was reading the paper Out of the Tar Pit authored by Ben Moseley and Peter Marks when I came across the following section on page 25 regarding essential mutable derived data: Essential Derived ...
0
votes
2answers
68 views

Mutable cursor in readonly object?

I've been searching for the different uses of the keyword mutable. I've found that it is generally used for caching, lazy computing, mutex, ... But I'm wondering if it is coherent to use it for a ...
3
votes
2answers
183 views

subclass of immutable object not immutable, can this work?

So I'm finishing up refactoring some code to remove a number of previously-mutable objects and add a better generic processing for all the classes in the domain. Just as I thought I was finishing I ...
-1
votes
4answers
858 views

Immutable vs mutable object as returned parameter for class method [closed]

There is a class method (static method) in which I create and build some object. And for filling that object, I create it as mutable object. My mutable object is a subclass of immutable object. So ...
4
votes
4answers
5k views

Is using “out” or “ref” parameters in Java methods to return extra values bad?

I happened to create a mutable class like this: class Mutable<T> { private T value; public Mutable() { this.value = null; } public Mutable(T value) { this.value = value; } T ...