Merge pull request #20715 from anayini/contiguous-array-codable

[SR-7076] Make ContiguousArray Codable

Author: moiseev

stdlib/public/core/Codable.swift.gyb

@@ -1767,6 +1767,40 @@ extension Array : Decodable where Element : Decodable {
   }
 }
 
+extension ContiguousArray : Encodable where Element : Encodable {
+  /// Encodes the elements of this contiguous array into the given encoder
+  /// in an unkeyed container.
+  ///
+  /// This function throws an error if any values are invalid for the given
+  /// encoder's format.
+  ///
+  /// - Parameter encoder: The encoder to write data to.
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.unkeyedContainer()
+    for element in self {
+      try container.encode(element)
+    }
+  }
+}
+
+extension ContiguousArray : Decodable where Element : Decodable {
+  /// Creates a new contiguous array by decoding from the given decoder.
+  ///
+  /// This initializer throws an error if reading from the decoder fails, or
+  /// if the data read is corrupted or otherwise invalid.
+  ///
+  /// - Parameter decoder: The decoder to read data from.
+  public init(from decoder: Decoder) throws {
+    self.init()
+
+    var container = try decoder.unkeyedContainer()
+    while !container.isAtEnd {
+      let element = try container.decode(Element.self)
+      self.append(element)
+    }
+  }
+}
+
 extension Set : Encodable where Element : Encodable {
   /// Encodes the elements of this set into the given encoder in an unkeyed
   /// container.