KeyedDecodingContainerProtocol

A type that provides a view into a decoder's storage and is used to hold the encoded properties of a decodable type in a keyed manner.

Conforming Types KeyedDecodingContainer
Associated Types
  • associatedtype Key

Decoders should provide types conforming to UnkeyedDecodingContainer for their format.

Instance Variables

var allKeys Required

All the keys the Decoder has for this container.

Different keyed containers from the same Decoder may return different keys here; it is possible to encode with multiple key types which are not convertible to one another. This should report all keys present which are convertible to the requested type.

Declaration

  • var allKeys: [Self.Key]
var codingPath Required

The path of coding keys taken to get to this point in decoding.

Declaration

Instance Methods

func contains(_ key: Self.Key) -> Bool Required

Returns a Boolean value indicating whether the decoder contains a value associated with the given key.

The value associated with key may be a null value as appropriate for the data format.

  • parameter key: The key to search for.

Declaration

  • func contains(_ key: Self.Key) -> Bool
func decode(_ type: Bool.Type, forKey key: Self.Key) throws -> Bool Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Bool.Type, forKey key: Self.Key) throws -> Bool
func decode(_ type: String.Type, forKey key: Self.Key) throws -> String Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: String.Type, forKey key: Self.Key) throws -> String
func decode(_ type: Double.Type, forKey key: Self.Key) throws -> Double Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Double.Type, forKey key: Self.Key) throws -> Double
func decode(_ type: Float.Type, forKey key: Self.Key) throws -> Float Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Float.Type, forKey key: Self.Key) throws -> Float
func decode(_ type: Int.Type, forKey key: Self.Key) throws -> Int Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Int.Type, forKey key: Self.Key) throws -> Int
func decode(_ type: Int8.Type, forKey key: Self.Key) throws -> Int8 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Int8.Type, forKey key: Self.Key) throws -> Int8
func decode(_ type: Int16.Type, forKey key: Self.Key) throws -> Int16 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Int16.Type, forKey key: Self.Key) throws -> Int16
func decode(_ type: Int32.Type, forKey key: Self.Key) throws -> Int32 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Int32.Type, forKey key: Self.Key) throws -> Int32
func decode(_ type: Int64.Type, forKey key: Self.Key) throws -> Int64 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: Int64.Type, forKey key: Self.Key) throws -> Int64
func decode(_ type: UInt.Type, forKey key: Self.Key) throws -> UInt Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: UInt.Type, forKey key: Self.Key) throws -> UInt
func decode(_ type: UInt8.Type, forKey key: Self.Key) throws -> UInt8 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: UInt8.Type, forKey key: Self.Key) throws -> UInt8
func decode(_ type: UInt16.Type, forKey key: Self.Key) throws -> UInt16 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: UInt16.Type, forKey key: Self.Key) throws -> UInt16
func decode(_ type: UInt32.Type, forKey key: Self.Key) throws -> UInt32 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: UInt32.Type, forKey key: Self.Key) throws -> UInt32
func decode(_ type: UInt64.Type, forKey key: Self.Key) throws -> UInt64 Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode(_ type: UInt64.Type, forKey key: Self.Key) throws -> UInt64
func decode(_ type: T.Type, forKey key: Self.Key) throws -> T Required

Decodes a value of the given type for the given key.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decode<T>(_ type: T.Type, forKey key: Self.Key) throws -> T where T: Decodable
func decodeIfPresent(_ type: Bool.Type, forKey key: Self.Key) throws -> Bool? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Bool.Type, forKey key: Self.Key) throws -> Bool?
func decodeIfPresent(_ type: String.Type, forKey key: Self.Key) throws -> String? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: String.Type, forKey key: Self.Key) throws -> String?
func decodeIfPresent(_ type: Double.Type, forKey key: Self.Key) throws -> Double? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Double.Type, forKey key: Self.Key) throws -> Double?
func decodeIfPresent(_ type: Float.Type, forKey key: Self.Key) throws -> Float? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Float.Type, forKey key: Self.Key) throws -> Float?
func decodeIfPresent(_ type: Int.Type, forKey key: Self.Key) throws -> Int? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Int.Type, forKey key: Self.Key) throws -> Int?
func decodeIfPresent(_ type: Int8.Type, forKey key: Self.Key) throws -> Int8? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Int8.Type, forKey key: Self.Key) throws -> Int8?
func decodeIfPresent(_ type: Int16.Type, forKey key: Self.Key) throws -> Int16? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Int16.Type, forKey key: Self.Key) throws -> Int16?
func decodeIfPresent(_ type: Int32.Type, forKey key: Self.Key) throws -> Int32? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Int32.Type, forKey key: Self.Key) throws -> Int32?
func decodeIfPresent(_ type: Int64.Type, forKey key: Self.Key) throws -> Int64? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: Int64.Type, forKey key: Self.Key) throws -> Int64?
func decodeIfPresent(_ type: UInt.Type, forKey key: Self.Key) throws -> UInt? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: UInt.Type, forKey key: Self.Key) throws -> UInt?
func decodeIfPresent(_ type: UInt8.Type, forKey key: Self.Key) throws -> UInt8? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: UInt8.Type, forKey key: Self.Key) throws -> UInt8?
func decodeIfPresent(_ type: UInt16.Type, forKey key: Self.Key) throws -> UInt16? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: UInt16.Type, forKey key: Self.Key) throws -> UInt16?
func decodeIfPresent(_ type: UInt32.Type, forKey key: Self.Key) throws -> UInt32? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: UInt32.Type, forKey key: Self.Key) throws -> UInt32?
func decodeIfPresent(_ type: UInt64.Type, forKey key: Self.Key) throws -> UInt64? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent(_ type: UInt64.Type, forKey key: Self.Key) throws -> UInt64?
func decodeIfPresent(_ type: T.Type, forKey key: Self.Key) throws -> T? Required

Decodes a value of the given type for the given key, if present.

This method returns nil if the container does not have a value associated with key, or if the value is null. The difference between these states can be distinguished with a contains(_:) call.

  • parameter type: The type of value to decode.
  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeIfPresent<T>(_ type: T.Type, forKey key: Self.Key) throws -> T? where T: Decodable
func decodeNil(forKey key: Self.Key) throws -> Bool Required

Decodes a null value for the given key.

  • parameter key: The key that the decoded value is associated with.

Declaration

  • func decodeNil(forKey key: Self.Key) throws -> Bool
func nestedContainer(keyedBy type: NestedKey.Type, forKey key: Self.Key) throws -> KeyedDecodingContainer<NestedKey> Required

Returns the data stored for the given key as represented in a container keyed by the given key type.

  • parameter type: The key type to use for the container.
  • parameter key: The key that the nested container is associated with.

Declaration

func nestedUnkeyedContainer(forKey key: Self.Key) throws -> UnkeyedDecodingContainer Required

Returns the data stored for the given key as represented in an unkeyed container.

  • parameter key: The key that the nested container is associated with.

Declaration

func superDecoder() throws -> Decoder Required

Returns a Decoder instance for decoding super from the container associated with the default super key.

Equivalent to calling superDecoder(forKey:) with Key(stringValue: "super", intValue: 0).

Declaration

  • func superDecoder() throws -> Decoder
func superDecoder(forKey key: Self.Key) throws -> Decoder Required

Returns a Decoder instance for decoding super from the container associated with the given key.

  • parameter key: The key to decode super for.

Declaration

  • func superDecoder(forKey key: Self.Key) throws -> Decoder