46 lines
2.0 KiB
Swift
46 lines
2.0 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import Foundation
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extension Collection {
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public subscript(ifValid index: Index) -> Iterator.Element? {
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return self.indices.contains(index) ? self[index] : nil
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}
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}
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public extension Collection {
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/// This creates an UnsafeMutableBufferPointer to access data in memory directly. This result pointer provides no automated
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/// memory management so after use you are responsible for handling the life cycle and need to call `deallocate()`.
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func unsafeCopy() -> UnsafeMutableBufferPointer<Element> {
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let copy = UnsafeMutableBufferPointer<Element>.allocate(capacity: self.underestimatedCount)
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_ = copy.initialize(from: self)
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return copy
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}
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}
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public extension Collection where Element == [CChar] {
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/// This creates an array of UnsafePointer types to access data of the C strings in memory. This array provides no automated
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/// memory management of it's children so after use you are responsible for handling the life cycle of the child elements and
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/// need to call `deallocate()` on each child.
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func unsafeCopy() -> [UnsafePointer<CChar>?] {
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return self.map { value in
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let copy = UnsafeMutableBufferPointer<CChar>.allocate(capacity: value.count)
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_ = copy.initialize(from: value)
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return UnsafePointer(copy.baseAddress)
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}
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}
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}
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public extension Collection where Element == [UInt8] {
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/// This creates an array of UnsafePointer types to access data of the C strings in memory. This array provides no automated
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/// memory management of it's children so after use you are responsible for handling the life cycle of the child elements and
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/// need to call `deallocate()` on each child.
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func unsafeCopy() -> [UnsafePointer<UInt8>?] {
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return self.map { value in
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let copy = UnsafeMutableBufferPointer<UInt8>.allocate(capacity: value.count)
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_ = copy.initialize(from: value)
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return UnsafePointer(copy.baseAddress)
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}
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}
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}
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