Behavior

public enum Behavior

Enumerates the supported behaviors for resolving collisions when two module flags share the same key. These collisions can occur when the different flags are inserted under the same key, or when modules containing flags under the same key are merged.

  • Emits an error if two values disagree, otherwise the resulting value is that of the operands.

    Declaration

    Swift

    case error

  • Emits a warning if two values disagree. The result value will be the operand for the flag from the first module being linked.

    Declaration

    Swift

    case warning

  • Adds a requirement that another module flag be present and have a specified value after linking is performed. The value must be a metadata pair, where the first element of the pair is the ID of the module flag to be restricted, and the second element of the pair is the value the module flag should be restricted to. This behavior can be used to restrict the allowable results (via triggering of an error) of linking IDs with the Override behavior.

    Declaration

    Swift

    case require

  • Uses the specified value, regardless of the behavior or value of the other module. If both modules specify Override, but the values differ, an error will be emitted.

    Declaration

    Swift

    case override

  • Appends the two values, which are required to be metadata nodes.

    Declaration

    Swift

    case append

  • Appends the two values, which are required to be metadata nodes. However, duplicate entries in the second list are dropped during the append operation.

    Declaration

    Swift

    case appendUnique