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Auto merge of #7337 - wilmoz:InheritanceDocumentation, r=mbrubeck

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Documentation of inheritance in type ids

Aditional documentation about this issue https://github.com/servo/servo/issues/7205

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bors-servo 2015-09-04 21:18:52 -06:00
commit da0b9d7c01
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17
components/script/dom/mod.rs
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@ -54,6 +54,23 @@
//! This invariant is enforced by the lint in
//! `plugins::lints::inheritance_integrity`.
//!
//! The same principle applies to typeids,
//! the derived type enum should
//! use one addititional type (the parent class) because sometimes the parent
//! can be the most-derived class of an object.
//! ```ignore
//! pub enum EventTypeId {
//! UIEvent(UIEventTypeId),
//! //others events
//! }
//!
//! pub enum UIEventTypeId {
//! MouseEvent,
//! KeyboardEvent,
//! UIEvent, //<- parent of MouseEvent and KeyboardEvent
//! }
//! ```
//!
//! Construction
//! ============
//!