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One of the Tuple Types in .net 4 is a Single-Element Tuple. I just wonder what the purpose of this struct is?
The only use I saw is when using in the 8+ Tuple as it can be assigned to TRest, where it actually makes sense. Is that it? Or is there any other purpose?
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In C#, a singleton tuple is a tuple that contains only one element and singleton tuple is also known as 1-tuple. You can create a 1-tuple using two different ways: Using Tuple<T1>(T1) Constructor. Using the Create method.
Tuples are generally used when you want to create a data structure which contains objects with their properties and you don't want to create a separate type for that. Features of Tuples: It allows us to represent multiple data into a single data set. It allows us to create, manipulate, and access data set.
The Tuple<T> class was introduced in . NET Framework 4.0. A tuple is a data structure that contains a sequence of elements of different data types. It can be used where you want to have a data structure to hold an object with properties, but you don't want to create a separate type for it.
1 Answer. While creating a tuple with a single element, add a comma at the end of the element. In the absence of a comma, Python will consider the element as an ordinary data type; not a tuple. Creating a Tuple with one element is called “Singleton” tuple.
You'd have to ask the BCL designers to be certain, but I suspect that since there is a 1-tuples in the real world, the .NET framework authors wanted to provide equivalent symmetry in their implementation.
Tuples are the .NET implementation of what you'd consider the mathematical concept of a tuple.
Now since you're asking for programming uses for Tuple<T>, I would also answer that there are .NET languages (like F#) that could use Tuple<> for representation of things like return values from functions. Since an F# function could certainly return a 1-tuple as a result - it adds symmetry and consistency to the behavior and feel of the language.
Your example with 8+ tuples is also probably legitimate, in that the Rest property could be a 1-tuple to represent the "overflow".
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Tuples automatically implement IStructuralComparable and IStructuralEquatable, among other things. This allows tuples to be compared and sorted right out of the box. From Bill McCarthy's article in December 2009 edition of Visual Studio Magazine, "Types and Tuples in .NET 4":
Although tuples may look simple and nondescript, they do provide strong typing and important comparison and equality functionality. Tuples are useful across method, class or even machine boundaries.
By putting your data type into a tuple, even of only one element, you are guaranteed immutability, equatability, and comparability. For tuples consisting of only one element, the main benefit of using a tuple is going to be immutability: once the tuple is created, it's data can never change for the life of the tuple.
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