primeNumberGenerator.h

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file primeNumberGenerator.h
 * @author drose
 * @date 2001-03-22
 */
 
#ifndef PRIMENUMBERGENERATOR_H
#define PRIMENUMBERGENERATOR_H
 
#include "dcbase.h"
 
#ifdef WITHIN_PANDA
// We only have the vector_int header file if we're compiling this package
// within the normal Panda environment.
#include "vector_int.h"
 
#else
typedef std::vector<int> vector_int;
#endif
 
/**
 * This class generates a table of prime numbers, up to the limit of an int.
 * For a given integer n, it will return the nth prime number.  This will
 * involve a recompute step only if n is greater than any previous n.
 */
class EXPCL_DIRECT_DCPARSER PrimeNumberGenerator {
public:
  PrimeNumberGenerator();
 
  int operator [] (int n);
 
private:
  typedef vector_int Primes;
  Primes _primes;
};
 
#endif