vendor/github.com/mitchellh/hashstructure/include.go

package hashstructure

// Includable is an interface that can optionally be implemented by
// a struct. It will be called for each field in the struct to check whether
// it should be included in the hash.
type Includable interface {
	HashInclude(field string, v interface{}) (bool, error)
}

// IncludableMap is an interface that can optionally be implemented by
// a struct. It will be called when a map-type field is found to ask the
// struct if the map item should be included in the hash.
type IncludableMap interface {
	HashIncludeMap(field string, k, v interface{}) (bool, error)
}