Nullary constructor
In computer programming, a nullary constructor is a constructor that takes no arguments.[1] Also known as a 0-argument constructor, no-argument constructor,[2] parameterless constructor or default constructor.[3]
Object-oriented constructors[edit]
In object-oriented programming, a constructor is code that is run when an object is created. Default constructors of objects are usually nullary.[4]
Java example[edit]
public class Example { protected int data; /* Nullary constructor */ public Example() { this(0); } /* Non-nullary constructor */ public Example(final int data) { this.data = data; } } Algebraic data types[edit]
In algebraic data types, a constructor is one of many tags that wrap data. If a constructor does not take any data arguments, it is nullary.
Haskell example[edit]
-- nullary type constructor with two nullary data constructors data Bool = False | True -- non-nullary type constructor with one non-nullary data constructor data Point a = Point a a -- non-nullary type constructor with... data Maybe a = Nothing -- ...nullary data constructor | Just a -- ...unary data constructor References[edit]
- ^ "Default Constructor in Java – Class Constructor Example". freeCodeCamp.org. 2022-01-13. Retrieved 2022-03-23.
- ^ "No-argument Constructor". chortle.ccsu.edu. Retrieved 2022-03-23.
- ^ "Default constructors - cppreference.com". en.cppreference.com. Retrieved 2023-04-12.
- ^ Ottinger, Joseph B.; Linwood, Jeff; Minter, Dave (2022), Ottinger, Joseph B.; Linwood, Jeff; Minter, Dave (eds.), "An Introduction to Hibernate 6", Beginning Hibernate 6: Java Persistence from Beginner to Pro, Berkeley, CA: Apress, pp. 1–25, doi:10.1007/978-1-4842-7337-1_1, ISBN 978-1-4842-7337-1, retrieved 2022-03-23
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