MetadataValue

public enum MetadataValue

extension Logger.MetadataValue: Equatable

extension Logger.MetadataValue: ExpressibleByStringLiteral

extension Logger.MetadataValue: CustomStringConvertible

extension Logger.MetadataValue: ExpressibleByStringInterpolation

extension Logger.MetadataValue: ExpressibleByDictionaryLiteral

extension Logger.MetadataValue: ExpressibleByArrayLiteral

A logging metadata value. Logger.MetadataValue is string, array, and dictionary literal convertible.

MetadataValue provides convenient conformances to ExpressibleByStringInterpolation, ExpressibleByStringLiteral, ExpressibleByArrayLiteral, and ExpressibleByDictionaryLiteral which means that when constructing MetadataValues you should default to using Swift’s usual literals.

Examples:

• prefer logger.info("user logged in", metadata: ["user-id": "\(user.id)"]) over ..., metadata: ["user-id": .string(user.id.description)])
• prefer logger.info("user selected colors", metadata: ["colors": ["\(user.topColor)", "\(user.secondColor)"]]) over ..., metadata: ["colors": .array([.string("\(user.topColor)"), .string("\(user.secondColor)")])
• prefer logger.info("nested info", metadata: ["nested": ["fave-numbers": ["\(1)", "\(2)", "\(3)"], "foo": "bar"]]) over ..., metadata: ["nested": .dictionary(["fave-numbers": ...])])