/usr/include/bobcat/primefactors is in libbobcat-dev 3.19.01-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | #ifndef INCLUDED_BOBCAT_PRIMEFACTORS_
#define INCLUDED_BOBCAT_PRIMEFACTORS_
#include <iostream>
#include <vector>
#include <fstream>
#include <memory>
#include <bobcat/bigint>
namespace FBB
{
struct PrimeFactors
{
struct PrimePower
{
BigInt prime;
size_t power;
};
typedef std::vector<PrimePower> Factors;
private:
typedef std::vector<BigInt> BigIntVector;
typedef BigIntVector::const_iterator ConstIterator;
class iterator
{
protected:
enum InputMode
{
PRIMES,
SENTINEL
};
int d_mode;
BigIntVector *d_primes;
ConstIterator d_iterator;
BigInt d_lastPrime;
BigIntVector d_sentinel;
public:
virtual ~iterator();
iterator();
iterator(BigIntVector &primes); // 2
iterator &operator++(); // opinc.f
void setSentinel(BigInt const &sentinel); // .f
BigInt const &operator*() const; // opstar.f
void nextPrime(); // .f
BigInt const &lastPrime() const; // .f
bool atSentinel() const; // .f
protected:
void checkInitialPrimes(BigIntVector const &primes) const;
bool isComposite(BigInt const &candidate);
private:
virtual iterator &operatorPreInc();
virtual void next();
};
class iteratorStream;
BigInt d_value;
BigInt d_last;
std::shared_ptr<iterator> d_iterator;
Factors d_factors;
public:
PrimeFactors(BigIntVector &primes);
PrimeFactors(std::string const &name = "", size_t blockSize = 1000);
PrimeFactors(PrimeFactors const &other) = delete;
Factors const &factorize(BigInt const &value);
private:
void reduce(BigInt const &prime);
void availablePrimes();
void addPrimes();
};
} // FBB
#endif
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