nullabilityとは 意味・読み方・使い方

名詞

nullability (countable かつ uncountable, 複数形 nullabilities)

1. (computing) The state or property of being nullable.
   • 1999, Brad McGehee, SQL Server 7 Administration, page 174:

     When this is not explicitly defined, a user-defined data type or a column definition will use the default setting for nullability.

   • 2006, Eric Gunnerson, A Programmer's Introduction to C# 2.0, page 271:

     Because nullability is one of a number of attributes of any particular database field, and because dealing with changes in nullability is no different from dealing with name and data type changes, the idea of making a value type nullable in C# when it isn't nullable in the database just in case the underlying database schema changes makes little sense.

   • 2017, Marcin Moskala, Android Development with Kotlin, page 43:

     We know that Kotlin requires us to explicitly define references that can hold null values. Java on the other hand is much more lenient about nullability, so we may wonder how Kotlin handles types coming from Java (basically the whole Android SDK かつ libraries written in Java).