using namespace appcon;
auto cfg = std::make_shared<config>();
(*cfg)
 ("config", std::string { "streamer.cfg" }, "Config file path")
 ("log", std::string { "debug" }, "log level, default INFO")
;
// We allow env-based config, used in Docker for example
cfg->from_environment("EXAMPLE_");
// Commandline parameters override environment
cfg->from_args(argc, argv);
// Config file support
cfg->from_file(
  /* Try to load from --config / EXAMPLE_CONFIG
   * if available...
  cfg->key("config"),
  /* ... but we don't mind too much if there's no file */
  config::ignore_missing
);
// Throw an exception if a config value is used
// that we don't already know about, or if it
// is declared with a default that does not
// match the existing default
cfg->strict(true);