Constraint
Constraint over undetermined type parameters. Constraints are built over values of the following types:
- TypeLambda A constraint constrains the type parameters of a set of TypeLambdas
- TypeParamRef The parameters of the constrained type lambdas
- TypeVar Every constrained parameter might be associated with a TypeVar that has the TypeParamRef as origin.
Type members
Types
Value members
Abstract methods
The weakest constraint that subsumes both this constraint and other.
The constraints should be compatible, meaning that a type lambda
occurring in both constraints is associated with the same typevars in each.
The weakest constraint that subsumes both this constraint and other.
The constraints should be compatible, meaning that a type lambda
occurring in both constraints is associated with the same typevars in each.
- Value Params
- otherHasErrors
If true, handle incompatible constraints by returning an approximate constraint, instead of failing with an exception
A new constraint which is derived from this constraint by adding
entries for all type parameters of poly.
A new constraint which is derived from this constraint by adding
entries for all type parameters of poly.
- Value Params
- tvars
A list of type variables associated with the params, or Nil if the constraint will just be checked for satisfiability but will solved to give instances of type variables.
A constraint that includes the relationship p1 <: p2.
<: relationships between parameters ("edges") are propagated, but
non-parameter bounds are left alone.
A constraint that includes the relationship p1 <: p2.
<: relationships between parameters ("edges") are propagated, but
non-parameter bounds are left alone.
Check that constraint only refers to TypeParamRefs bound by itself
Check that constraint only refers to TypeParamRefs bound by itself
Check that every typevar om this constraint has as origin a type parameter of athe type lambda that is associated with the typevar itself.
Check that every typevar om this constraint has as origin a type parameter of athe type lambda that is associated with the typevar itself.
Check that no constrained parameter contains itself as a bound
Check that no constrained parameter contains itself as a bound
Does the constraint's domain contain the type parameters of tl?
Does the constraint's domain contain the type parameters of tl?
Does the constraint's domain contain the type parameter param?
Does the constraint's domain contain the type parameter param?
Does this constraint contain the type variable tvar and is it uninstantiated?
Does this constraint contain the type variable tvar and is it uninstantiated?
A string describing the constraint's contents without a header or trailer
A string describing the constraint's contents without a header or trailer
The type lambda parameters constrained by this constraint
The type lambda parameters constrained by this constraint
The given tl in case it is not contained in this constraint,
a fresh copy of tl otherwise.
The given tl in case it is not contained in this constraint,
a fresh copy of tl otherwise.
The constraint entry for given type parameter param, or NoType if param is not part of
the constraint domain. Note: Low level, implementation dependent.
The constraint entry for given type parameter param, or NoType if param is not part of
the constraint domain. Note: Low level, implementation dependent.
Check whether predicate holds for all parameters in constraint
Check whether predicate holds for all parameters in constraint
Perform operation op on all typevars that do not have their inst field set.
Perform operation op on all typevars that do not have their inst field set.
Gives for each instantiated type var that does not yet have its inst field
set, the instance value stored in the constraint. Storing instances in constraints
is done only in a temporary way for contexts that may be retracted
without also retracting the type var as a whole.
Gives for each instantiated type var that does not yet have its inst field
set, the instance value stored in the constraint. Storing instances in constraints
is done only in a temporary way for contexts that may be retracted
without also retracting the type var as a whole.
Is entry associated with tl removable? This is the case if
all type parameters of the entry are associated with type variables
which have their inst fields set.
Is entry associated with tl removable? This is the case if
all type parameters of the entry are associated with type variables
which have their inst fields set.
The parameters that are known to be smaller wrt <: than param
The parameters that are known to be smaller wrt <: than param
The lower dominator set.
The lower dominator set.
This is like lower, except that each parameter returned is no smaller than every other returned parameter.
The upper dominator set.
The upper dominator set.
This is like upper, except that each parameter returned is no greater than every other returned parameter.
The constraint bounds for given type parameter param.
Poly params that are known to be smaller or greater than param
are not contained in the return bounds.
The constraint bounds for given type parameter param.
Poly params that are known to be smaller or greater than param
are not contained in the return bounds.
Does param occur at the toplevel in tp ?
Toplevel means: the type itself or a factor in some
combination of & or | types.
Does param occur at the toplevel in tp ?
Toplevel means: the type itself or a factor in some
combination of & or | types.
A new constraint with all entries coming from tl removed.
A new constraint with all entries coming from tl removed.
A new constraint which is derived from this constraint by removing
the type parameter param from the domain and replacing all top-level occurrences
of the parameter elsewhere in the constraint by type tp, or a conservative
approximation of it if that is needed to avoid cycles.
Occurrences nested inside a refinement or prefix are not affected.
A new constraint which is derived from this constraint by removing
the type parameter param from the domain and replacing all top-level occurrences
of the parameter elsewhere in the constraint by type tp, or a conservative
approximation of it if that is needed to avoid cycles.
Occurrences nested inside a refinement or prefix are not affected.
A new constraint with entry from replaced with to
Rerences to from from within other constraint bounds are updated to to.
Type variables are left alone.
A new constraint with entry from replaced with to
Rerences to from from within other constraint bounds are updated to to.
Type variables are left alone.
The type variable corresponding to parameter param, or
NoType, if param is not in constrained or is not paired with a type variable.
The type variable corresponding to parameter param, or
NoType, if param is not in constrained or is not paired with a type variable.
A constraint resulting from adding p2 = p1 to this constraint, and at the same time transferring all bounds of p2 to p1
A constraint resulting from adding p2 = p1 to this constraint, and at the same time transferring all bounds of p2 to p1
The uninstantiated typevars of this constraint, which still have a bounds constraint
The uninstantiated typevars of this constraint, which still have a bounds constraint
A new constraint which is derived from this constraint by updating
the entry for parameter param to tp.
tp can be one of the following:
A new constraint which is derived from this constraint by updating
the entry for parameter param to tp.
tp can be one of the following:
- A TypeBounds value, indicating new constraint bounds
- Another type, indicating a solution for the parameter
Inherited methods
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
The string representation of this showable element.
The string representation of this showable element.
- Inherited from
- Showable
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
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