primesieve
7.5
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Contains primesieve's C++ functions and classes. More...
Classes | |
class | iterator |
primesieve::iterator allows to easily iterate over primes both forwards and backwards. More... | |
class | primesieve_error |
primesieve throws a primesieve_error exception if an error occurs e.g. More... | |
Functions | |
template<typename T > | |
void | generate_primes (uint64_t stop, std::vector< T > *primes) |
Store the primes <= stop in the primes vector. | |
template<typename T > | |
void | generate_primes (uint64_t start, uint64_t stop, std::vector< T > *primes) |
Store the primes within the interval [start, stop] in the primes vector. | |
template<typename T > | |
void | generate_n_primes (uint64_t n, std::vector< T > *primes) |
Store the first n primes in the primes vector. | |
template<typename T > | |
void | generate_n_primes (uint64_t n, uint64_t start, std::vector< T > *primes) |
Store the first n primes >= start in the primes vector. | |
uint64_t | nth_prime (int64_t n, uint64_t start=0) |
Find the nth prime. More... | |
uint64_t | count_primes (uint64_t start, uint64_t stop) |
Count the primes within the interval [start, stop]. More... | |
uint64_t | count_twins (uint64_t start, uint64_t stop) |
Count the twin primes within the interval [start, stop]. More... | |
uint64_t | count_triplets (uint64_t start, uint64_t stop) |
Count the prime triplets within the interval [start, stop]. More... | |
uint64_t | count_quadruplets (uint64_t start, uint64_t stop) |
Count the prime quadruplets within the interval [start, stop]. More... | |
uint64_t | count_quintuplets (uint64_t start, uint64_t stop) |
Count the prime quintuplets within the interval [start, stop]. More... | |
uint64_t | count_sextuplets (uint64_t start, uint64_t stop) |
Count the prime sextuplets within the interval [start, stop]. More... | |
void | print_primes (uint64_t start, uint64_t stop) |
Print the primes within the interval [start, stop] to the standard output. | |
void | print_twins (uint64_t start, uint64_t stop) |
Print the twin primes within the interval [start, stop] to the standard output. | |
void | print_triplets (uint64_t start, uint64_t stop) |
Print the prime triplets within the interval [start, stop] to the standard output. | |
void | print_quadruplets (uint64_t start, uint64_t stop) |
Print the prime quadruplets within the interval [start, stop] to the standard output. | |
void | print_quintuplets (uint64_t start, uint64_t stop) |
Print the prime quintuplets within the interval [start, stop] to the standard output. | |
void | print_sextuplets (uint64_t start, uint64_t stop) |
Print the prime sextuplets within the interval [start, stop] to the standard output. | |
uint64_t | get_max_stop () |
Returns the largest valid stop number for primesieve. More... | |
int | get_sieve_size () |
Get the current set sieve size in KiB. | |
int | get_num_threads () |
Get the current set number of threads. | |
void | set_sieve_size (int sieve_size) |
Set the sieve size in KiB (kibibyte). More... | |
void | set_num_threads (int num_threads) |
Set the number of threads for use in primesieve::count_*() and primesieve::nth_prime(). More... | |
std::string | primesieve_version () |
Get the primesieve version number, in the form “i.j”. | |
Contains primesieve's C++ functions and classes.
uint64_t primesieve::count_primes | ( | uint64_t | start, |
uint64_t | stop | ||
) |
Count the primes within the interval [start, stop].
By default all CPU cores are used, use primesieve::set_num_threads(int threads) to change the number of threads.
Note that each call to count_primes() incurs an initialization overhead of O(sqrt(stop)) even if the interval [start, stop] is tiny. Hence if you have written an algorithm that makes many calls to count_primes() it may be preferable to use a primesieve::iterator which needs to be initialized only once.
uint64_t primesieve::count_quadruplets | ( | uint64_t | start, |
uint64_t | stop | ||
) |
Count the prime quadruplets within the interval [start, stop].
By default all CPU cores are used, use primesieve::set_num_threads(int threads) to change the number of threads.
uint64_t primesieve::count_quintuplets | ( | uint64_t | start, |
uint64_t | stop | ||
) |
Count the prime quintuplets within the interval [start, stop].
By default all CPU cores are used, use primesieve::set_num_threads(int threads) to change the number of threads.
uint64_t primesieve::count_sextuplets | ( | uint64_t | start, |
uint64_t | stop | ||
) |
Count the prime sextuplets within the interval [start, stop].
By default all CPU cores are used, use primesieve::set_num_threads(int threads) to change the number of threads.
uint64_t primesieve::count_triplets | ( | uint64_t | start, |
uint64_t | stop | ||
) |
Count the prime triplets within the interval [start, stop].
By default all CPU cores are used, use primesieve::set_num_threads(int threads) to change the number of threads.
uint64_t primesieve::count_twins | ( | uint64_t | start, |
uint64_t | stop | ||
) |
Count the twin primes within the interval [start, stop].
By default all CPU cores are used, use primesieve::set_num_threads(int threads) to change the number of threads.
uint64_t primesieve::get_max_stop | ( | ) |
Returns the largest valid stop number for primesieve.
uint64_t primesieve::nth_prime | ( | int64_t | n, |
uint64_t | start = 0 |
||
) |
Find the nth prime.
By default all CPU cores are used, use primesieve::set_num_threads(int threads) to change the number of threads.
Note that each call to nth_prime(n, start) incurs an initialization overhead of O(sqrt(start)) even if n is tiny. Hence it is not a good idea to use nth_prime() repeatedly in a loop to get the next (or previous) prime. For this use case it is better to use a primesieve::iterator which needs to be initialized only once.
n | if n = 0 finds the 1st prime >= start, if n > 0 finds the nth prime > start, if n < 0 finds the nth prime < start (backwards). |
void primesieve::set_num_threads | ( | int | num_threads | ) |
Set the number of threads for use in primesieve::count_*() and primesieve::nth_prime().
By default all CPU cores are used.
void primesieve::set_sieve_size | ( | int | sieve_size | ) |
Set the sieve size in KiB (kibibyte).
The best sieving performance is achieved with a sieve size of your CPU's L1 or L2 cache size (per core).