[Pitch] Temporary uninitialized buffers

Evolution Pitches
,
29

Instead of adding more top-level functions, you could add a static method to each type:

extension UnsafeMutableRawBufferPointer {

  public static func withEphemeral<R>(
    byteCount: Int,
    alignment: Int,
    do body: (inout Self) throws -> R
  ) rethrows -> R
}

extension UnsafeMutableBufferPointer {

  public static func withEphemeral<R>(
    capacity: Int,
    do body: (inout Self) throws -> R
  ) rethrows -> R
}

This may improve call sites, especially if the caller is using their own type aliases:

typealias Bytes = UnsafeMutableRawBufferPointer

Bytes.withEphemeral(byteCount: 42, alignment: 1) { bytes in /*...*/ }
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