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    Abstract Types | Scala Documentation

    Abstract Types | Scala Documentation
    Traits and abstract classes can have an abstract type member. ... We can extend this trait in an abstract class, adding an upper-type-bound to T to make it more specific. .... +T <: Seq[U] ) in order to hide the concrete sequence implementation type of ... Generic Classes · Variances · Upper Type Bounds · Lower Type Bounds ...

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    One standard problem, which has been around for a long time, is the problem of animals and foods. In java you have abstract methods, but you cant pass a method as a parameter. In an object-oriented framework where classes can be extended by inheritance, they may also be used as a flexible means of parameterization (often called family polymorphism, see this (note family polymorphism has been proposed for object-oriented languages as a solution to supporting reusable yet type-safe mutually recursive classes.

    This site uses cookies to deliver our services and to show you relevant ads and job listings. I am not sure the relationship is that different between using abstract types or generics. You can pass methods (or functions) as parameters, or you can abstract over them.

    So in a sense you could say scala is a more orthogonal and complete language. To understand what martin is speaking about when it comes to explosion of parameters, and usually, whats more, in , and its subsequent quadratically growth when abstract type are modeled using generics, you can consider the paper written by. So in java you also have all three of these, but theres a distinction about what abstraction principle you can use for what kinds of things.

    Actually, you cant do that in java because it turns out you can construct unsound situations, like the problem of assigning a fruit to an apple variable that i talked about earlier. Update (october2009) what follows below has actually been illustrated in this new article by bill venners (here is the relevant extract of the first interview, may 2009, emphasis mine) in java you also have both, but it depends on what you are abstracting over. By using our site, you acknowledge that you have read and understand our.

    What you want is to be able to say that a cow has an eat method that eats only grass and not other things. A key idea of family polymorphism is the notion of families, which are used to group mutually recursive classes) abstract class maxcell extends abscell type t. Martin odersky, and matthias zenger for oopsla 2005, referenced in the abstract types can hide information about internals of a component, similar to their use in signatures.

    Furthermore, there are cases where it is not possible to replace abstract types with type parameters. You could parameterize class animal with the kind of food it eats. Then you have an abstract types provide this notion of a type in a superclass that i dont know, which i then fill in later in subclasses with something i do know indeed you can. Your use of stack overflows products and services, including the stack overflow network, is subject to these policies and terms. The problem is if we subclass animal and have a class such as cow, then they would eat only grass and not arbitrary food.


    Scala: Abstract types vs generics - Stack Overflow


    Nov 7, 2011 ... Abstract Type Members versus Generic Type Parameters in Scala (see summary at the ... What, in particular, abstract types buy you is a nice treatment for these ...

    Scala Abstract Type Vs Generic Cialis Buy

    Generics and type members · ghik/opinionated-scala Wiki · GitHub
    Here's an example generic method in Scala - it takes a value and duplicates it into a ... We'll talk about type aliases and abstract type members later. .... Type members vs type parameters ..... Contact GitHub · API · Training · Shop · Blog · About.
    Scala Abstract Type Vs Generic Cialis Buy A class/trait with an abstract type is quite similar to a class/trait type parameter. Update (october2009) what follows below has actually been illustrated in this new article by bill venners (here is the relevant extract of the first interview, may 2009, emphasis mine) in java you also have both, but it depends on what you are abstracting over. Generic Classes · Variances · Upper Type Bounds · Lower Type Bounds . One standard problem, which has been around for a long time, is the problem of animals and foods. This site uses cookies to deliver our services and to show you relevant ads and job listings. Oct 7, 2009. And similarly you dont have abstract type members, but you can specify a type as a parameter. Contact GitHub · API · Training · Shop · Blog · About. To illustrate this, we now look at a program which deals with a sequence buffer that refers to a list of integers it is also possible to turn abstract type members into type parameters of classes and vice versa. A common question asked by people learning Scala is how to decide between abstract type members and generic type parameters when you . Traits and abstract classes can have an abstract type member. This topic (and the next) are intended to discuss abstract types.
  • Abstract Type Members versus Generic Type Parameters in Scala - Artima


    A key idea of family polymorphism is the notion of families, which are used to group mutually recursive classes) abstract class maxcell extends abscell type t. At the 1998 ecoop, kim bruce, phil wadler, and i had a paper where we showed that as you increase the number of things you dont know, the typical program will grow quadratically so there are very good reasons not to do parameters, but to have these abstract members, because they dont give you this quadratic blow up. And what we get conceptually is that we can model one in terms of the other. Then you have an abstract types provide this notion of a type in a superclass that i dont know, which i then fill in later in subclasses with something i do know indeed you can. One standard problem, which has been around for a long time, is the problem of animals and foods.

    And similarly you dont have abstract type members, but you can specify a type as a parameter. Actually, you cant do that in java because it turns out you can construct unsound situations, like the problem of assigning a fruit to an apple variable that i talked about earlier. . To illustrate this, we now look at a program which deals with a sequence buffer that refers to a list of integers it is also possible to turn abstract type members into type parameters of classes and vice versa. What you want is to be able to say that a cow has an eat method that eats only grass and not other things.

    Martin odersky, and matthias zenger for oopsla 2005, referenced in the abstract types can hide information about internals of a component, similar to their use in signatures. This site uses cookies to deliver our services and to show you relevant ads and job listings. At least in principle, we can express every sort of parameterization as a form of object-oriented abstraction. Furthermore, there are cases where it is not possible to replace abstract types with type parameters. So in a sense you could say scala is a more orthogonal and complete language. You can pass methods (or functions) as parameters, or you can abstract over them. Update (october2009) what follows below has actually been illustrated in this new article by bill venners (here is the relevant extract of the first interview, may 2009, emphasis mine) in java you also have both, but it depends on what you are abstracting over. Here is a version of the code above which only uses type parameters ) in order to hide the concrete sequence implementation type of the object returned from method. So in java you also have all three of these, but theres a distinction about what abstraction principle you can use for what kinds of things. Your use of stack overflows products and services, including the stack overflow network, is subject to these policies and terms.

    Oct 7, 2009 ... A common question asked by people learning Scala is how to decide between abstract type members and generic type parameters when you ...

    Daily scala: Abstract Types vs Parameter

    May 3, 2010 ... Abstract Types vs Parameter. This topic (and the next) are intended to discuss abstract types. A class/trait with an abstract type is quite similar to a class/trait type parameter. For example: .... Labels: abstract type, generic, Scala ...
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