Dictionary+CollectionValues.swift

extension Dictionary where Value: Collection {

    /// A Boolean value indicating whether all collection-values in dictionary is empty.
    var isContentsEmpty: Bool {
        for collection in values where !collection.isEmpty {
            return false
        }
        return true
    }
}

extension Dictionary where Value: Collection, Value.IndexDistance == Int {

    /// The number of elements in all dictionary`s values-collections.
    var totalCount: Int {
        return self.reduce(0) { (count, keyValue) -> Int in
            count + keyValue.value.count
        }
    }
}