关系的,Cluster可以是几个类,或者几个子Cluster,或者是它们的混合。但是Cluster不是Eiffel的语言构造(英语:Languageconstruct),Eiffel语言中,类是惟一的构造模块。 一支程式語言都會有"Hello, world!"的程式碼。以Eiffel的表示如下: class
in language programs. Upper Saddle River, NJ: Prentice Hall Regents. 1996 [2018-08-28]. (原始内容存档于2017-05-17). Cronbach, L. J.; Meehl, P.E. Construct Validity
`if let` expression. [2014-12-04]. (原始内容存档于2016-03-04). The `if let` construct is based on the precedent set by Swift, which introduced its own `if let`