SwresTools/Extras/PointerExtras.swift
2017-03-14 16:42:00 -07:00

37 lines
946 B
Swift

//
// PointerExtras.swift
// SwresTools
//
import Darwin
// For performance, there are a few places strings are passed around as a base pointer
// and a count of bytes. The Swift standard library includes `UnsafeBufferPointer` and
// `UnsafeMutableBufferPointer` which could wrap that pointer and length, but it's
// surprisingly slow. Replacing that with this tiny `Buffer` struct sped up string
// formatting hotpaths considerably.
struct Buffer<T> {
let pointer: UnsafePointer<T>
let count: Int
}
class ManagedUnsafeMutablePointer<T>: Hashable {
let pointer: UnsafeMutablePointer<T>
init(adoptPointer: UnsafeMutablePointer<T>) {
pointer = adoptPointer
}
deinit {
free(pointer)
}
var hashValue: Int {
return pointer.hashValue
}
static func ==(lhs: ManagedUnsafeMutablePointer, rhs: ManagedUnsafeMutablePointer) -> Bool {
return lhs.pointer == rhs.pointer
}
}