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primeNumberGenerator.h
00001 // Filename: primeNumberGenerator.h
00002 // Created by:  drose (22Mar01)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef PRIMENUMBERGENERATOR_H
00016 #define PRIMENUMBERGENERATOR_H
00017 
00018 #include "dcbase.h"
00019 
00020 #ifdef WITHIN_PANDA
00021 // We only have the vector_int header file if we're compiling this
00022 // package within the normal Panda environment.
00023 #include "vector_int.h"
00024 
00025 #else
00026 typedef vector<int> vector_int;
00027 #endif
00028 
00029 ////////////////////////////////////////////////////////////////////
00030 //       Class : PrimeNumberGenerator
00031 // Description : This class generates a table of prime numbers, up to
00032 //               the limit of an int.  For a given integer n, it will
00033 //               return the nth prime number.  This will involve a
00034 //               recompute step only if n is greater than any previous
00035 //               n.
00036 ////////////////////////////////////////////////////////////////////
00037 class PrimeNumberGenerator {
00038 public:
00039   PrimeNumberGenerator();
00040 
00041   int operator [] (int n);
00042 
00043 private:
00044   typedef vector_int Primes;
00045   Primes _primes;
00046 };
00047 
00048 #endif
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