Function check_output_impl

cpp-subprocess/subprocess.hpp:2153–2163

{
  template<typename F, typename... Args>
  OutBuffer check_output_impl(F& farg, Args&&... args)
  {
    static_assert(!detail::has_type<output, detail::param_pack<Args...>>::value, "output not allowed in args");
    auto p = Popen(std::forward<F>(farg), std::forward<Args>(args)..., output{PIPE});
    auto res = p.communicate();
    auto retcode = p.retcode();
    if (retcode > 0) {
      throw CalledProcessError("Command failed : Non zero retcode", retcode);
    }
    return std::move(res.first);
  }

  template<typename F, typename... Args>
  int call_impl(F& farg, Args&&... args)