content: /*
   * # Copyright (c) 2016-2019 The Khronos Group Inc.
   * #
   * # 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.
   */
  
  // Taken from quiver package
  
  // Copyright 2013 Google Inc. All Rights Reserved.
  //
  // 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.
  
  /// Generates a hash code for multiple [objects].
  int hashObjects(Iterable<Object> objects) =>
      _finish(objects.fold(0, (h, i) => _combine(h, i.hashCode)));
  
  /// Generates a hash code for two objects.
  int hash2(Object a, Object b) =>
      _finish(_combine(_combine(0, a.hashCode), b.hashCode));
  
  /// Generates a hash code for three objects.
  int hash3(Object a, Object b, Object c) => _finish(
      _combine(_combine(_combine(0, a.hashCode), b.hashCode), c.hashCode));
  
  /// Generates a hash code for four objects.
  int hash4(Object a, Object b, Object c, Object d) => _finish(_combine(
      _combine(_combine(_combine(0, a.hashCode), b.hashCode), c.hashCode),
      d.hashCode));
  
  // Jenkins hash functions
  
  int _combine(int hash, int value) {
    var _hash = 0x1fffffff & (hash + value);
    _hash = 0x1fffffff & (_hash + ((0x0007ffff & _hash) << 10));
    return _hash ^ (_hash >> 6);
  }
  
  int _finish(int hash) {
    var _hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
    _hash = _hash ^ (_hash >> 11);
    return 0x1fffffff & (_hash + ((0x00003fff & _hash) << 15));
  }
  