Inter-operability of Swift arrays with C?

Question

How can one pass or copy the data in a C array, such as

float foo[1024];

, between C and Swift functions that use fixed size arrays, such as d

Answer 1

let's see what Apple do:

public struct float4 {

    public var x: Float

    public var y: Float

    public var z: Float

    public var w: Float

    /// Initialize to the zero vector.
    public init()

    /// Initialize a vector with the specified elements.
    public init(_ x: Float, _ y: Float, _ z: Float, _ w: Float)

    /// Initialize a vector with the specified elements.
    public init(x: Float, y: Float, z: Float, w: Float)

    /// Initialize to a vector with all elements equal to `scalar`.
    public init(_ scalar: Float)

    /// Initialize to a vector with elements taken from `array`.
    ///
    /// - Precondition: `array` must have exactly four elements.
    public init(_ array: [Float])

    /// Access individual elements of the vector via subscript.
    public subscript(index: Int) -> Float
}