TlObject.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once

#include <cstddef>
#include <cstdint>
#include <string>
#include <type_traits>
#include <utility>

namespace td {

class TlStorerCalcLength;

class TlStorerUnsafe;

class TlStorerToString;

class TlObject {
 public:
  virtual std::int32_t get_id() const = 0;

  virtual void store(TlStorerUnsafe &s) const {
  }

  virtual void store(TlStorerCalcLength &s) const {
  }

  virtual void store(TlStorerToString &s, const char *field_name) const = 0;

  TlObject() = default;

  TlObject(const TlObject &) = delete;

  TlObject &operator=(const TlObject &) = delete;

  TlObject(TlObject &&) = default;

  TlObject &operator=(TlObject &&) = default;

  virtual ~TlObject() = default;
};

namespace tl {

template <class T>
class unique_ptr {
 public:
  using pointer = T *;
  using element_type = T;

  unique_ptr() noexcept = default;
  unique_ptr(const unique_ptr &other) = delete;
  unique_ptr &operator=(const unique_ptr &other) = delete;
  unique_ptr(unique_ptr &&other) noexcept : ptr_(other.release()) {
  }
  unique_ptr &operator=(unique_ptr &&other) noexcept {
    reset(other.release());
    return *this;
  }
  ~unique_ptr() {
    reset();
  }

  unique_ptr(std::nullptr_t) noexcept {
  }
  explicit unique_ptr(T *ptr) noexcept : ptr_(ptr) {
  }
  template <class S, class = typename std::enable_if<std::is_base_of<T, S>::value>::type>
  unique_ptr(unique_ptr<S> &&other) noexcept : ptr_(static_cast<S *>(other.release())) {
  }
  template <class S, class = typename std::enable_if<std::is_base_of<T, S>::value>::type>
  unique_ptr &operator=(unique_ptr<S> &&other) noexcept {
    reset(static_cast<T *>(other.release()));
    return *this;
  }
  void reset(T *new_ptr = nullptr) noexcept {
    static_assert(sizeof(T) > 0, "Can't destroy unique_ptr with incomplete type");
    delete ptr_;
    ptr_ = new_ptr;
  }
  T *release() noexcept {
    auto res = ptr_;
    ptr_ = nullptr;
    return res;
  }
  T *get() noexcept {
    return ptr_;
  }
  const T *get() const noexcept {
    return ptr_;
  }
  T *operator->() noexcept {
    return ptr_;
  }
  const T *operator->() const noexcept {
    return ptr_;
  }
  T &operator*() noexcept {
    return *ptr_;
  }
  const T &operator*() const noexcept {
    return *ptr_;
  }
  explicit operator bool() const noexcept {
    return ptr_ != nullptr;
  }

 private:
  T *ptr_{nullptr};
};

template <class T>
bool operator==(std::nullptr_t, const unique_ptr<T> &p) {
  return !p;
}
template <class T>
bool operator==(const unique_ptr<T> &p, std::nullptr_t) {
  return !p;
}
template <class T>
bool operator!=(std::nullptr_t, const unique_ptr<T> &p) {
  return static_cast<bool>(p);
}
template <class T>
bool operator!=(const unique_ptr<T> &p, std::nullptr_t) {
  return static_cast<bool>(p);
}

}  // namespace tl

template <class Type>
using tl_object_ptr = tl::unique_ptr<Type>;

template <class Type, class... Args>
tl_object_ptr<Type> make_tl_object(Args &&...args) {
  return tl_object_ptr<Type>(new Type(std::forward<Args>(args)...));
}

template <class ToT, class FromT>
tl_object_ptr<ToT> move_tl_object_as(tl_object_ptr<FromT> &from) {
  return tl_object_ptr<ToT>(static_cast<ToT *>(from.release()));
}

template <class ToT, class FromT>
tl_object_ptr<ToT> move_tl_object_as(tl_object_ptr<FromT> &&from) {
  return tl_object_ptr<ToT>(static_cast<ToT *>(from.release()));
}

}  // namespace td