Support.hpp

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/*
 * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef __SUPPORT_H__
#define __SUPPORT_H__
 
#include <string>
 
#include <iostream>
#include <memory>
 
class Cmdline
{
public:
  Cmdline() = delete;
  Cmdline(int argc, const char *const *argv) : _argc(static_cast<unsigned int>(argc)), _argv{argv}
  {
    // DO NOTHING
  }
 
  std::string get(unsigned int index) const;
  std::string get_or(unsigned int index, const std::string &) const;
 
private:
  unsigned int _argc;
  const char *const *_argv;
};
 
class UI
{
public:
  std::istream *in() const { return _in ? _in.get() : &std::cin; }
  std::ostream *out() const { return _out ? _out.get() : &std::cout; }
 
public:
  void in(std::unique_ptr<std::istream> &&in) { _in = std::move(in); }
  void out(std::unique_ptr<std::ostream> &&out) { _out = std::move(out); }
 
private:
  std::unique_ptr<std::istream> _in;
  std::unique_ptr<std::ostream> _out;
};
 
std::unique_ptr<UI> make_ui(const Cmdline &cmdargs);
 
#endif // __SUPPORT_H__