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