Null object: Difference between revisions
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=={{header|Chapel}}== |
=={{header|Chapel}}== |
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Class variables can be declared as nil if and only if they have nilable class type, declared with postfix ?, alongside memory management technique owned, borrowed, shared, or unmanaged. A nilable class type is default initialized to nil. |
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Objects variables without an initializer expression will be initiallized to nil: |
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<syntaxhighlight lang="chapel"> |
<syntaxhighlight lang="chapel"> |
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class C { }; |
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var c:C; // is nil |
var c : owned C?; // is nil |
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writeln(if c == nil then "nil" else "something"); |
writeln(if c == nil then "nil" else "something"); |
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</syntaxhighlight> |
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=={{header|Clojure}}== |
=={{header|Clojure}}== |
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