38 lines
1.2 KiB
Swift
38 lines
1.2 KiB
Swift
//
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// ComponentIdentifier.swift
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// FirebladeECS
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//
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// Created by Christian Treffs on 20.08.19.
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//
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/// Identifies a component by it's meta type
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public struct ComponentIdentifier {
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public typealias Identifier = Int
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public let id: Identifier
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}
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extension ComponentIdentifier {
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@usableFromInline
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init<C>(_ componentType: C.Type) where C: Component {
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self.id = Self.makeRuntimeHash(componentType)
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}
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/// object identifier hash (only stable during runtime) - arbitrary hash is ok.
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internal static func makeRuntimeHash<C>(_ componentType: C.Type) -> Identifier where C: Component {
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ObjectIdentifier(componentType).hashValue
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}
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internal static func makeStableTypeHash(component: Component) -> StableId {
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let componentTypeString = String(describing: type(of: component))
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return StringHashing.singer_djb2(componentTypeString)
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}
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internal static func makeStableInstanceHash(component: Component, entityId: EntityIdentifier) -> StableId {
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let componentTypeString = String(describing: type(of: component)) + String(entityId.id)
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return StringHashing.singer_djb2(componentTypeString)
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}
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}
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extension ComponentIdentifier: Equatable { }
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extension ComponentIdentifier: Hashable { }
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