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package dotty.tools.dotc.core
import Names.Name
import Contexts.Context
import Types.Type
/** A common super trait of Symbol and LambdaParam.
* Used to capture the attributes of type parameters which can be implemented as either.
*/
trait ParamInfo {
type ThisName <: Name
/** Is this the info of a type parameter? Will return `false` for symbols
* that are not type parameters.
*/
def isTypeParam(implicit ctx: Context): Boolean
/** The name of the type parameter */
def paramName(implicit ctx: Context): ThisName
/** The info of the type parameter */
def paramInfo(implicit ctx: Context): Type
/** The info of the type parameter as seen from a prefix type.
* For type parameter symbols, this is the `memberInfo` as seen from `prefix`.
* For type lambda parameters, it's the same as `paramInfos` as
* `asSeenFrom` has already been applied to the whole type lambda.
*/
def paramInfoAsSeenFrom(pre: Type)(implicit ctx: Context): Type
/** The parameter bounds, or the completer if the type parameter
* is an as-yet uncompleted symbol.
*/
def paramInfoOrCompleter(implicit ctx: Context): Type
/** The variance of the type parameter */
def paramVariance(implicit ctx: Context): Int
/** A type that refers to the parameter */
def paramRef(implicit ctx: Context): Type
}
object ParamInfo {
type Of[N] = ParamInfo { type ThisName = N }
}
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