Constrained genericity: Difference between revisions
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m (J: remove stale intro quip, simplify, and add some narrative description) |
(→{{header|Ruby}}: Added Ruby) |
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All the tests pass. Look at the tests to see what generates an exception (i.e. |
All the tests pass. Look at the tests to see what generates an exception (i.e. |
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not allowed at runtime) and what does not. |
not allowed at runtime) and what does not. |
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=={{header|Ruby}}== |
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<lang ruby>class Foodbox |
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def initialize (*food) |
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raise ArgumentError, "food must be eadible" unless food.all?{|f| f.respond_to?(:eat)} |
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@box = food |
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end |
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end |
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class Fruit |
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def eat; end |
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end |
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class Apple < Fruit; end |
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p Foodbox.new(Fruit.new, Apple.new) |
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# => #<Foodbox:0x00000001420c88 @box=[#<Fruit:0x00000001420cd8>, #<Apple:0x00000001420cb0>]> |
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p Foodbox.new(Apple.new, "string can't eat") |
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# => test1.rb:3:in `initialize': food must be eadible (ArgumentError) |
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</lang> |
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=={{header|Sather}}== |
=={{header|Sather}}== |
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