def infer_type_arguments(type_var_ids: List[int],
template: Type, actual: Type,
basic: BasicTypes) -> List[Type]:
# Like infer_function_type_arguments, but only match a single type
# against a generic type.
constraints = infer_constraints(template, actual, SUBTYPE_OF)
return solve_constraints(type_var_ids, constraints, basic)
def infer_type_arguments(type_var_ids: List[TypeVarId],
template: Type, actual: Type,
is_supertype: bool = False) -> List[Optional[Type]]:
# Like infer_function_type_arguments, but only match a single type
# against a generic type.
constraints = infer_constraints(template, actual,
SUPERTYPE_OF if is_supertype else SUBTYPE_OF)
return solve_constraints(type_var_ids, constraints)
BasicTypes basic):
"""Infer the type arguments of a generic function.
Return an array of lower bound types for the type variables -1 (at
index 0), -2 (at index 1), etc. A lower bound is None if a value
could not be inferred.
Arguments:
callee_type: the target generic function
arg_types: argument types at the call site
arg_kinds: nodes.ARG_* values for arg_types
formal_to_actual: mapping from formal to actual variable indices
basic: references to basic types which are needed during inference
"""
# Infer constraints.
constraints = infer_constraints_for_callable(
callee_type, arg_types, arg_kinds, formal_to_actual)
# Solve constraints.
type_vars = callee_type.type_var_ids()
return solve_constraints(type_vars, constraints, basic)
Type[] infer_type_arguments(int[] type_var_ids,
Type template, Type actual,
BasicTypes basic):
# Like infer_function_type_arguments, but only match a single type
# against a generic type.
constraints = infer_constraints(template, actual, SUBTYPE_OF)
return solve_constraints(type_var_ids, constraints, basic)
def infer_type_arguments(type_var_ids, template, actual, basic):
# Like infer_function_type_arguments, but only match a single type
# against a generic type.
constraints = infer_constraints(template, actual, SUBTYPE_OF)
return solve_constraints(type_var_ids, constraints, basic)