http://kreegerresearch.com/wiki/ 2026-04-22T11:02:47+0000 http://kreegerresearch.com/wiki/ http://kreegerresearch.com/wiki/lib/tpl/monobook/images/favicon.ico text/html 2017-02-25T18:01:48+0000 Anonymous (anonymous@undisclosed.example.com) http://kreegerresearch.com/wiki/doku.php?id=c_11:examples:chrono_stop_watch.cc&rev=1488045708&do=diff #include <iostream> #include <chrono> #include <ctime> long fibonacci(unsigned n) { if (n < 2) return n; return fibonacci(n-1) + fibonacci(n-2); } int main() { std::chrono::time_point<std::chrono::system_clock> start, end; start = std::chrono::system_clock::now(); std::cout << "f(42) = " << fibonacci(42) << '\n'; end = std::chrono::system_clock::now(); std::chrono::duration<double> elapsed_seconds = end-start; std::time_t end_time = std::chrono::system_clock… text/html 2017-02-25T18:01:06+0000 Anonymous (anonymous@undisclosed.example.com) http://kreegerresearch.com/wiki/doku.php?id=c_11:examples:dir_list_cc&rev=1488045666&do=diff #include <iostream> #include <dirent.h> #include <vector> // To Build: gcc -std=c++11 dir_list.cc -lstdc++ -o dir_list int getdir (std::string dir, std::vector<std::string> &files) { DIR *dp; struct dirent *dirp; if((dp = opendir(dir.c_str())) == NULL) { std::cout << "Error(" << errno << ") opening " << dir << std::endl; return errno; } while ((dirp = readdir(dp)) != NULL) { files.push_back(std::string(dirp->d_name)); } closedir(dp); re… text/html 2017-02-25T18:04:01+0000 Anonymous (anonymous@undisclosed.example.com) http://kreegerresearch.com/wiki/doku.php?id=c_11:examples:port_scanner.cc&rev=1488045841&do=diff Port Scanner #include <cstdlib> #include <iomanip> #include <iostream> #include <SFML/Network.hpp> #include <sstream> #include <string> #include <vector> static bool port_is_open(const std::string& address, int port) { return (sf::SocketTCP().connect(address, port) == sf::Socket::Done); } static std::vector<std::string> split(const std::string& string, char delimiter = ' ', bool allow_empty = false) { std::ve… text/html 2017-02-25T18:02:30+0000 Anonymous (anonymous@undisclosed.example.com) http://kreegerresearch.com/wiki/doku.php?id=c_11:examples:thread_2.cc&rev=1488045750&do=diff thread_2.cc #include <iostream> #include <thread> #include <mutex> using namespace::std; // gcc -std=c++11 thread_1.cc -lstdc++ -o thread_1 std::mutex mu; void shared_print(string msg,int id) { std::lock_guard<std::mutex> guard(mu); // RAII - when guard goes out of scope //mu.lock(); // if cout throws an exception then the program will be locked forever. cout << msg << id << endl; // still could mess up output if other process writes to cout. //mu.unlock(); } void fun1() { …