GadtConstraint

sealed abstract class GadtConstraint extends Showable

Represents GADT constraints currently in scope

trait Showable
class Object
trait Matchable
class Any

Value members

Abstract methods

def addBound(sym: Symbol, bound: Type, isUpper: Boolean)(using Context): Boolean

Further constrain a symbol already present in the constraint.

Further constrain a symbol already present in the constraint.

Add symbols to constraint, correctly handling inter-dependencies.

Add symbols to constraint, correctly handling inter-dependencies.

See also:
def bounds(sym: Symbol)(using Context): TypeBounds | Null

Immediate bounds of sym. Does not contain lower/upper symbols (see fullBounds).

Immediate bounds of sym. Does not contain lower/upper symbols (see fullBounds).

def contains(sym: Symbol)(using Context): Boolean

Is the symbol registered in the constraint?

Is the symbol registered in the constraint?

Note:

this is true even if the symbol is constrained to be equal to another type, unlike Constraint.contains.

def fullBounds(sym: Symbol)(using Context): TypeBounds | Null

Full bounds of sym, including TypeRefs to other lower/upper symbols.

Full bounds of sym, including TypeRefs to other lower/upper symbols.

Note:

this performs subtype checks between ordered symbols. Using this in isSubType can lead to infinite recursion. Consider bounds instead.

def isLess(sym1: Symbol, sym2: Symbol)(using Context): Boolean

Is sym1 ordered to be less than sym2?

Is sym1 ordered to be less than sym2?

GADT constraint narrows bounds of at least one variable

GADT constraint narrows bounds of at least one variable

Restore the state from other GadtConstraint, probably copied using fresh

Restore the state from other GadtConstraint, probably copied using fresh

Concrete methods

Inherited methods

def fallbackToText(printer: Printer): Text

A fallback text representation, if the pattern matching in Printers does not have a case for this showable element

A fallback text representation, if the pattern matching in Printers does not have a case for this showable element

Inherited from:
Showable
def show(using Context): String

The string representation of this showable element.

The string representation of this showable element.

Inherited from:
Showable
def showIndented(margin: Int)(using Context): String

The string representation with each line after the first one indented by the given given margin (in spaces).

The string representation with each line after the first one indented by the given given margin (in spaces).

Inherited from:
Showable
def showSummary(depth: Int)(using Context): String

The summarized string representation of this showable element. Recursion depth is limited to some smallish value. Default is Config.summarizeDepth.

The summarized string representation of this showable element. Recursion depth is limited to some smallish value. Default is Config.summarizeDepth.

Inherited from:
Showable
def toText(printer: Printer): Text

The text representation of this showable element. This normally dispatches to a pattern matching method in Printers.

The text representation of this showable element. This normally dispatches to a pattern matching method in Printers.

Inherited from:
Showable