共変性と反変性
1. Covariance and contravariance (computer science)Within the type system of a programming language, covariance and contravariance refers to the ordering of types from narrower to wider and their interchangeability or equivalence in certain situations (such as parameters, generics, and return types). covariant: converting from wider (Animals) to narrower (Cats). contravariant: converting from narrower (Triangles) to wider (Shapes). invariant: Not able to convert.
Read “Covariance and contravariance (computer science)” on English Wikipedia
Read “共変性と反変性” on Japanese Wikipedia
Read “Covariance and contravariance (computer science)” on DBpedia
Read “Covariance and contravariance (computer science)” on English Wikipedia
Read “共変性と反変性” on Japanese Wikipedia
Read “Covariance and contravariance (computer science)” on DBpedia
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