Function version

src/linux/perf.cpp:195–205

Future<Version> version()
{
  internal::Perf* perf = new internal::Perf({"--version"});
  Future<string> output = perf->output();
  spawn(perf, true);

  return output
    .then([](const string& output) -> Future<Version> {
      return parseVersion(output);
    });
};


// Since there is a lot of variety in perf(1) version strings