text: // Copyright (c) 2016-2019 The Bitcoin Core developers
  // Copyright (c) 2019 The Picscoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_SUPPORT_EVENTS_H
  #define BITCOIN_SUPPORT_EVENTS_H
  
  #include <ios>
  #include <memory>
  
  #include <event2/event.h>
  #include <event2/http.h>
  
  #define MAKE_RAII(type) \
  /* deleter */\
  struct type##_deleter {\
      void operator()(struct type* ob) {\
          type##_free(ob);\
      }\
  };\
  /* unique ptr typedef */\
  typedef std::unique_ptr<struct type, type##_deleter> raii_##type
  
  MAKE_RAII(event_base);
  MAKE_RAII(event);
  MAKE_RAII(evhttp);
  MAKE_RAII(evhttp_request);
  MAKE_RAII(evhttp_connection);
  
  inline raii_event_base obtain_event_base() {
      auto result = raii_event_base(event_base_new());
      if (!result.get())
          throw std::runtime_error("cannot create event_base");
      return result;
  }
  
  inline raii_event obtain_event(struct event_base* base, evutil_socket_t s, short events, event_callback_fn cb, void* arg) {
      return raii_event(event_new(base, s, events, cb, arg));
  }
  
  inline raii_evhttp obtain_evhttp(struct event_base* base) {
      return raii_evhttp(evhttp_new(base));
  }
  
  inline raii_evhttp_request obtain_evhttp_request(void(*cb)(struct evhttp_request *, void *), void *arg) {
      return raii_evhttp_request(evhttp_request_new(cb, arg));
  }
  
  inline raii_evhttp_connection obtain_evhttp_connection_base(struct event_base* base, std::string host, uint16_t port) {
      auto result = raii_evhttp_connection(evhttp_connection_base_new(base, nullptr, host.c_str(), port));
      if (!result.get())
          throw std::runtime_error("create connection failed");
      return result;
  }
  
  #endif // BITCOIN_SUPPORT_EVENTS_H
  