content: /*******************************************************************************
   * Copyright (c) 2010 Haifeng Li
   *   
   * 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.
   *******************************************************************************/
  package smile.math.random;
  
  /**
   * Random number generator interface.
   * 
   * @author Haifeng Li
   */
  public interface RandomNumberGenerator {
      /**
       * Initialize the random generator with a seed.
       */
      public void setSeed(long seed);
  
      /**
       * Returns up to 32 random bits.
       */
      public int next(int numbits);
  
      /**
       * Returns the next pseudorandom, uniformly distributed int value
       * from this random number generator's sequence.
       */
      public int nextInt();
      
      /**
       * Returns a pseudorandom, uniformly distributed int value
       * between 0 (inclusive) and the specified value (exclusive),
       * drawn from this random number generator's sequence.
       */
      public int nextInt(int n);
      
      /**
       * Returns the next pseudorandom, uniformly distributed long value
       * from this random number generator's sequence.
       */
      public long nextLong();
      
      /**
       * Returns the next pseudorandom, uniformly distributed double value
       * between 0.0 and 1.0 from this random number generator's sequence.
       */
      public double nextDouble();
      
      /**
       * Returns a vector of pseudorandom, uniformly distributed double values
       * between 0.0 and 1.0 from this random number generator's sequence.
       */
      public void nextDoubles(double[] d);
  }