Deep-C | a deep learning library for C language | Machine Learning library

If you simply want to check if the two collections are equal you need to define what equality is, for example by implementing IEqualityComparer. This can also be done by implementing IEquatable or or by overriding Equals(object) and GetHasCode. This can be done automatically by some refactoring tools:

Your composer.json already lists symfony/symfony as a required package. This contains symfony/mime - as long as you are using Symfony v4.3 or later. The MIME component did not exist before that.

This Article states that,

Deep copy is a process in which the copying process occurs recursively. It means first constructing a new collection object and then recursively populating it with copies of the child objects found in the original.

So my understanding tells that,

It's actually quite simple to create an Rcpp SparseMatrix class! I was overthinking it.

The linked duplicate does actually address your question, but you need to adjust it to your situation and not just copy paste.

But why aren't people suggesting doing the following?

You're using the same list object as all inner_dict values, and deepcopy respects that and keeps it that way. Which you clearly don't want. So don't do that in the first place. Do inner_dict = {d: [0, 0] for d in delimiters} instead.

As the fromkeys documentation says:

All of the values refer to just a single instance, so it generally doesn’t make sense for value to be a mutable object such as an empty list. To get distinct values, use a dict comprehension instead.

As said in comments, due to the lack of other proposals, I finally retained my own initial approach and used Automapper to clone my setting object when a new instance of the consuming class is created. Here's an exemple for a Service and its setting object. If your "setting" object have classes in its properties, remember to clone them also or you will only have a reference copy of the initial singleton ! To avoid this trap you could also use a true "clone library" more suited for this cases than Automapper.

If I understand the question correctly, you should be good to go with the code bellow at the start of the .map func.

if( Object.is(value, source) ) { return }

MDN Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is

Object.is() determines whether two values are the same value. Two values are the same if one of the following holds...

• both the same object (meaning both values reference the same object in memory)