check in return_code.h

/**

 * This file is part of the "FnordMetric" project

 *   Copyright (c) 2016 Paul Asmuth, FnordCorp B.V.

 *

 * FnordMetric is free software: you can redistribute it and/or modify it under

 * the terms of the GNU General Public License v3.0. You should have received a

 * copy of the GNU General Public License along with this program. If not, see

 * <http://www.gnu.org/licenses/>.

 */

#pragma once

#include <memory>

#include <mutex>

#include <stdlib.h>

#include <string>

#include <stdarg.h>

#include "stringutil.h"

namespace signaltk {

class ReturnCode {

public:

  inline static ReturnCode success() {

    return ReturnCode(true);

  }

  inline static ReturnCode error(

      const std::string& code,

      const std::string& message) {

    ReturnCode rc(false);

    rc.code_ = code;

    rc.message_ = message;

    return rc;

  }

  inline static ReturnCode errorp(

      const std::string& code,

      const char* message,

      ...) {

    ReturnCode rc(false);

    rc.code_ = code;

    va_list args;

    va_start(args, message);

    int bufsize = 1024;//vsnprintf(nullptr, 0, message, args);

    rc.message_.resize(bufsize + 1);

    bufsize = vsnprintf(&rc.message_[0], rc.message_.size(), message, args);

    rc.message_.resize(bufsize);

    va_end(args);

    return rc;

  }

  template <typename... T>

  inline static ReturnCode errorf(

      const std::string& code,

      const std::string& message,

      T... args) {

    return ReturnCode::error(code, StringUtil::format(message, args...));

  }

  inline bool isError() const {

    return !success_;

  }

  inline bool isSuccess() const {

    return success_;

  }

  inline const std::string& getCode() const {

    return code_;

  }

  inline const std::string& getMessage() const {

    return message_;

  }

protected:

  ReturnCode(bool success) : success_(success) {}

  bool success_;

  std::string code_;

  std::string message_;

};

} // namespace signaltk