Copyright (c) 2018 Thomas Bytheway All rights reserved. This software was developed within the University of Cambridge Computer Laboratory. Funding was provided through a series of Industrial Research Grants as part of the Digital Technology Group (DTG) Fabric For Reproducible Computing (FRESCO) research program. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.