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| author | Martin Odersky <odersky@gmail.com> | 2015-01-13 17:35:12 +0100 |
|---|---|---|
| committer | Martin Odersky <odersky@gmail.com> | 2015-01-13 17:35:12 +0100 |
| commit | 3e3ef5222429beddedd6912feeff7975bdd67bf8 (patch) | |
| tree | 9646fa0c2fd872c923fc8d3cb2a16f72884c30ee /src/dotty/tools/dotc/core/ConstraintHandling.scala | |
| parent | 155049286628843eb7aeb2d8d610ac53291ea6f3 (diff) | |
| download | dotty-3e3ef5222429beddedd6912feeff7975bdd67bf8.tar.gz dotty-3e3ef5222429beddedd6912feeff7975bdd67bf8.tar.bz2 dotty-3e3ef5222429beddedd6912feeff7975bdd67bf8.zip | |
Two new hooks in ConstraintHandling
Unlike isSubtypeWhenFrozen, these can be implemented by
TrackingConstraint without needing full bounds, which is expensive.
Diffstat (limited to 'src/dotty/tools/dotc/core/ConstraintHandling.scala')
| -rw-r--r-- | src/dotty/tools/dotc/core/ConstraintHandling.scala | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/dotty/tools/dotc/core/ConstraintHandling.scala b/src/dotty/tools/dotc/core/ConstraintHandling.scala index 2aa2a4acd..c3243f5d9 100644 --- a/src/dotty/tools/dotc/core/ConstraintHandling.scala +++ b/src/dotty/tools/dotc/core/ConstraintHandling.scala @@ -68,8 +68,14 @@ trait ConstraintHandling { try isSubType(tp1, tp2) finally frozenConstraint = saved } + + protected def constraintImpliesSub(param: PolyParam, tp: Type): Boolean = + isSubTypeWhenFrozen(bounds(param).hi, tp) + + protected def constraintImpliesSuper(param: PolyParam, tp: Type): Boolean = + isSubTypeWhenFrozen(tp, bounds(param).lo) - /** The current bounds of type parameter `param` */ + /** The current bounds of type parameter `param` */ final def bounds(param: PolyParam): TypeBounds = constraint at param match { case bounds: TypeBounds if !ignoreConstraint => bounds case _ => param.binder.paramBounds(param.paramNum) |