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package cty
import (
"errors"
)
type collectionTypeImpl interface {
ElementType() Type
}
// IsCollectionType returns true if the given type supports the operations
// that are defined for all collection types.
func (t Type) IsCollectionType() bool {
_, ok := t.typeImpl.(collectionTypeImpl)
return ok
}
// ElementType returns the element type of the receiver if it is a collection
// type, or panics if it is not. Use IsCollectionType first to test whether
// this method will succeed.
func (t Type) ElementType() Type {
if ct, ok := t.typeImpl.(collectionTypeImpl); ok {
return ct.ElementType()
}
panic(errors.New("not a collection type"))
}
// ElementCallback is a callback type used for iterating over elements of
// collections and attributes of objects.
//
// The types of key and value depend on what type is being iterated over.
// Return true to stop iterating after the current element, or false to
// continue iterating.
type ElementCallback func(key Value, val Value) (stop bool)
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