--- /dev/null
+#include <functional>
+#include <mutex>
+#include <set>
+#include <thread>
+
+#include <websocketpp/config/asio_no_tls.hpp>
+#include <websocketpp/server.hpp>
+
+typedef websocketpp::server<websocketpp::config::asio> server;
+
+using websocketpp::connection_hdl;
+
+class count_server {
+public:
+ count_server() : m_count(0) {
+ m_server.init_asio();
+
+ m_server.set_open_handler(bind(&count_server::on_open,this,_1));
+ m_server.set_close_handler(bind(&count_server::on_close,this,_1));
+ }
+
+ void on_open(connection_hdl hdl) {
+ std::lock_guard<std::mutex> lock(m_mutex);
+ m_connections.insert(hdl);
+ }
+
+ void on_close(connection_hdl hdl) {
+ std::lock_guard<std::mutex> lock(m_mutex);
+ m_connections.erase(hdl);
+ }
+
+ void count() {
+ while (1) {
+ sleep(1);
+ m_count++;
+
+ std::stringstream ss;
+ ss << m_count;
+
+ std::lock_guard<std::mutex> lock(m_mutex);
+ for (auto it : m_connections) {
+ m_server.send(it,ss.str(),websocketpp::frame::opcode::text);
+ }
+ }
+ }
+
+ void run(uint16_t port) {
+ m_server.listen(port);
+ m_server.start_accept();
+ m_server.run();
+ }
+private:
+ typedef std::set<connection_hdl,std::owner_less<connection_hdl>> con_list;
+
+ int m_count;
+ server m_server;
+ con_list m_connections;
+ std::mutex m_mutex;
+};
+
+int main() {
+ count_server server;
+ std::thread t(std::bind(&count_server::count,&server));
+ server.run(9002);
+}
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