42 lines
839 B
Swift
42 lines
839 B
Swift
//
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// NdbTagIterators.swift
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// damus
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//
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// Created by William Casarin on 2023-07-21.
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//
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import Foundation
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struct TagSequence: Sequence, IteratorProtocol {
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let note: NdbNote
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let tag: UnsafeMutablePointer<ndb_tag>
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var index: Int32
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var count: UInt16 {
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tag.pointee.count
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}
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mutating func next() -> NdbTagElem? {
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guard index < tag.pointee.count else { return nil }
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let el = NdbTagElem(note: note, tag: tag, index: index)
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index += 1
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return el
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}
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subscript(index: Int) -> NdbTagElem? {
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if index >= tag.pointee.count {
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return nil
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}
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return NdbTagElem(note: note, tag: tag, index: Int32(index))
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}
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}
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func ndb_maybe_pointee<T>(_ p: UnsafeMutablePointer<T>!) -> T? {
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guard p != nil else { return nil }
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return p.pointee
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}
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