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Date:2008-09-19T07:54:43.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@25 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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2008-09-19 07:54:43 +00:00
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documentation/current/method/invitation-eiffel-i2e/i2e-polymorphism-and-dynamic-binding.wiki
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[[Property:title|11 Polymorphism and Dynamic Binding]]
[[Property:link_title|I2E: Polymorphism and Dynamic Binding]]
[[Property:weight|-4]]
[[Property:uuid|1c3221be-0237-1c9a-407d-652a4084de12]]
Inheritance is not just a module combination and enrichment mechanism. It also enables the definition of flexible entities that may become attached to objects of various forms at run time, a property known as polymorphism.
This remarkable facility must be reconciled with static typing. The language convention is simple: an assignment of the form <code> a </code> <code> : </code> <code> b </code> is permitted not only if <code> a </code> and <code> b </code> are of the same type, but more generally if <code> a </code> and <code> b </code> are of reference types <code> A </code> and <code> B </code>, based on classes <code> A </code> and <code> B </code> such that <code> B </code> is a descendant of <code> A </code>.