Struct Assignment C

Struct Assignment C-20
Here is a quick refresher for value semantics and the features of value types presented in aforementioned WWDC sessions. Instances of value types are created in the stack and on each assignment or passing the value around (between functions or threads) there will be a unique instance(if compiler is not sure there will be no mutation, a new copy) and it will be passed.Therefore, you are guaranteed with no shared state.

Here is a quick refresher for value semantics and the features of value types presented in aforementioned WWDC sessions. Instances of value types are created in the stack and on each assignment or passing the value around (between functions or threads) there will be a unique instance(if compiler is not sure there will be no mutation, a new copy) and it will be passed.Therefore, you are guaranteed with no shared state.Therewithal it was Swift taking a pass at the functional programming community since the latter aims the same goals, even in today’s increasingly concurrent world.

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As I mentioned above I’m preparing another article for that.In functional programming world, there is no country for shared state, mutating state and related side effects.That said it has its disadvantages as well, such as its inability to fit perfectly to machine model or its inefficiency in cases where the mutation is a good choice.Examples of good candidates for structures include:- The size of a geometric shape, perhaps encapsulating a width property and a height property, both of type Double.- A way to refer to ranges within a series, perhaps encapsulating a start property and a length property, both of type Int.- A point in a 3D coordinate system, perhaps encapsulating x, y and z properties, each of type Double.In all other cases, define a class, and create instances of that class to be managed and passed by reference.Important: This article was published for Swift 4.0 and updated on through the language updates that show up with Swift 4.1 and 4.2. Some of the statements on article directly affected by these changes and they are NOT valid for new versions for the language.I’m preparing another article for what’s changed and how it affect our case.Swift has powerful and rich value types that support methods, implementing protocols(interfaces), extensions etc.Even though Apple recommended using value types since then, the milestones in the brief history of Swift were actually the following two sessions of WWDC 2015.But I think this topic needs huge attention, because most of the developer community is unaware of the problems with value type usages. In this post, I will try to address some anti-patterns of Swift value type usages.Then I will try to explain how these can affect our expectations of reality.

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