ex14_30_StrBlob.h

/*
=================================================================================

C++ Primer 5th Exercise Answer Source Code
Copyright (C) 2014-2015 github.com/pezy/Cpp-Primer

StrBlob, StrBlobPtr, ConstStrBlobPtr

If you have questions, try to connect with me: pezy<urbancpz@gmail.com>

=================================================================================
*/

#ifndef CP5_STRBLOB_H_
#define CP5_STRBLOB_H_

#include <vector>
using std::vector;

#include <string>
using std::string;

#include <initializer_list>
using std::initializer_list;

#include <memory>
using std::make_shared;
using std::shared_ptr;

#include <exception>

#ifndef _MSC_VER
#define NOEXCEPT noexcept
#else
#define NOEXCEPT
#endif

class StrBlobPtr;
class ConstStrBlobPtr;

//=================================================================================
//
//		StrBlob - custom vector<string>
//
//=================================================================================

class StrBlob {
  using size_type = vector<string>::size_type;
  friend class ConstStrBlobPtr;
  friend class StrBlobPtr;
  friend bool operator==(const StrBlob &, const StrBlob &);
  friend bool operator!=(const StrBlob &, const StrBlob &);
  friend bool operator<(const StrBlob &, const StrBlob &);
  friend bool operator>(const StrBlob &, const StrBlob &);
  friend bool operator<=(const StrBlob &, const StrBlob &);
  friend bool operator>=(const StrBlob &, const StrBlob &);

public:
  StrBlob() : data(make_shared<vector<string>>()) {}
  StrBlob(initializer_list<string> il)
      : data(make_shared<vector<string>>(il)) {}

  StrBlob(const StrBlob &sb) : data(make_shared<vector<string>>(*sb.data)) {}
  StrBlob &operator=(const StrBlob &);

  StrBlob(StrBlob &&rhs) NOEXCEPT : data(std::move(rhs.data)) {}
  StrBlob &operator=(StrBlob &&) NOEXCEPT;

  StrBlobPtr begin();
  StrBlobPtr end();

  ConstStrBlobPtr cbegin() const;
  ConstStrBlobPtr cend() const;

  string &operator[](size_t n);
  const string &operator[](size_t n) const;

  size_type size() const { return data->size(); }
  bool empty() const { return data->empty(); }

  void push_back(const string &t) { data->push_back(t); }
  void push_back(string &&s) { data->push_back(std::move(s)); }

  void pop_back();
  string &front();
  string &back();
  const string &front() const;
  const string &back() const;

private:
  void check(size_type, const string &) const;

  shared_ptr<vector<string>> data;
};

bool operator==(const StrBlob &, const StrBlob &);
bool operator!=(const StrBlob &, const StrBlob &);
bool operator<(const StrBlob &, const StrBlob &);
bool operator>(const StrBlob &, const StrBlob &);
bool operator<=(const StrBlob &, const StrBlob &);
bool operator>=(const StrBlob &, const StrBlob &);

inline void StrBlob::pop_back() {
  check(0, "pop_back on empty StrBlob");
  data->pop_back();
}

inline string &StrBlob::front() {
  check(0, "front on empty StrBlob");
  return data->front();
}

inline string &StrBlob::back() {
  check(0, "back on empty StrBlob");
  return data->back();
}

inline const string &StrBlob::front() const {
  check(0, "front on empty StrBlob");
  return data->front();
}

inline const string &StrBlob::back() const {
  check(0, "back on empty StrBlob");
  return data->back();
}

inline void StrBlob::check(size_type i, const string &msg) const {
  if (i >= data->size())
    throw std::out_of_range(msg);
}

inline string &StrBlob::operator[](size_t n) {
  check(n, "out of range");
  return data->at(n);
}

inline const string &StrBlob::operator[](size_t n) const {
  check(n, "out of range");
  return data->at(n);
}

//=================================================================================
//
//		StrBlobPtr - custom iterator of StrBlob
//
//=================================================================================

class StrBlobPtr {
  friend bool operator==(const StrBlobPtr &, const StrBlobPtr &);
  friend bool operator!=(const StrBlobPtr &, const StrBlobPtr &);
  friend bool operator<(const StrBlobPtr &, const StrBlobPtr &);
  friend bool operator>(const StrBlobPtr &, const StrBlobPtr &);
  friend bool operator<=(const StrBlobPtr &, const StrBlobPtr &);
  friend bool operator>=(const StrBlobPtr &, const StrBlobPtr &);

public:
  StrBlobPtr() : curr(0) {}
  StrBlobPtr(StrBlob &s, size_t sz = 0) : wptr(s.data), curr(sz) {}

  string &deref() const;
  StrBlobPtr &operator++();
  StrBlobPtr &operator--();
  StrBlobPtr operator++(int);
  StrBlobPtr operator--(int);
  StrBlobPtr &operator+=(size_t);
  StrBlobPtr &operator-=(size_t);
  StrBlobPtr operator+(size_t) const;
  StrBlobPtr operator-(size_t) const;

  string &operator[](size_t n);
  const string &operator[](size_t n) const;

private:
  shared_ptr<vector<string>> check(size_t, const string &) const;

  std::weak_ptr<vector<string>> wptr;
  size_t curr;
};

bool operator==(const StrBlobPtr &, const StrBlobPtr &);
bool operator!=(const StrBlobPtr &, const StrBlobPtr &);
bool operator<(const StrBlobPtr &, const StrBlobPtr &);
bool operator>(const StrBlobPtr &, const StrBlobPtr &);
bool operator<=(const StrBlobPtr &, const StrBlobPtr &);
bool operator>=(const StrBlobPtr &, const StrBlobPtr &);

inline string &StrBlobPtr::deref() const {
  auto p = check(curr, "dereference past end");
  return (*p)[curr];
}

inline StrBlobPtr &StrBlobPtr::operator++() {
  check(curr, "increment past end of StrBlobPtr");
  ++curr;
  return *this;
}

inline StrBlobPtr &StrBlobPtr::operator--() {
  --curr;
  check(curr, "decrement past begin of StrBlobPtr");
  return *this;
}

inline StrBlobPtr StrBlobPtr::operator++(int) {
  StrBlobPtr ret = *this;
  ++*this;
  return ret;
}

inline StrBlobPtr StrBlobPtr::operator--(int) {
  StrBlobPtr ret = *this;
  --*this;
  return ret;
}

inline StrBlobPtr &StrBlobPtr::operator+=(size_t n) {
  curr += n;
  check(curr, "increment past end of StrBlobPtr");
  return *this;
}

inline StrBlobPtr &StrBlobPtr::operator-=(size_t n) {
  curr -= n;
  check(curr, "increment past end of StrBlobPtr");
  return *this;
}

inline StrBlobPtr StrBlobPtr::operator+(size_t n) const {
  StrBlobPtr ret = *this;
  ret += n;
  return ret;
}

inline StrBlobPtr StrBlobPtr::operator-(size_t n) const {
  StrBlobPtr ret = *this;
  ret -= n;
  return ret;
}

inline shared_ptr<vector<string>> StrBlobPtr::check(size_t i,
                                                    const string &msg) const {
  auto ret = wptr.lock();
  if (!ret)
    throw std::runtime_error("unbound StrBlobPtr");
  if (i >= ret->size())
    throw std::out_of_range(msg);
  return ret;
}

inline string &StrBlobPtr::operator[](size_t n) {
  auto p = check(n, "dereference out of range.");
  return (*p)[n];
}

inline const string &StrBlobPtr::operator[](size_t n) const {
  auto p = check(n, "dereference out of range.");
  return (*p)[n];
}

//=================================================================================
//
//		ConstStrBlobPtr - custom const_iterator of StrBlob
//
//=================================================================================

class ConstStrBlobPtr {
  friend bool operator==(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
  friend bool operator!=(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
  friend bool operator<(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
  friend bool operator>(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
  friend bool operator<=(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
  friend bool operator>=(const ConstStrBlobPtr &, const ConstStrBlobPtr &);

public:
  ConstStrBlobPtr() : curr(0) {}
  ConstStrBlobPtr(const StrBlob &s, size_t sz = 0) : wptr(s.data), curr(sz) {}

  const string &operator*() const;
  const string *operator->() const;
  ConstStrBlobPtr &operator++();
  ConstStrBlobPtr &operator--();
  ConstStrBlobPtr operator++(int);
  ConstStrBlobPtr operator--(int);
  ConstStrBlobPtr &operator+=(size_t);
  ConstStrBlobPtr &operator-=(size_t);
  ConstStrBlobPtr operator+(size_t) const;
  ConstStrBlobPtr operator-(size_t) const;

  const string &operator[](size_t n) const;

private:
  std::shared_ptr<vector<string>> check(size_t, const string &) const;

  std::weak_ptr<vector<string>> wptr;
  size_t curr;
};

bool operator==(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
bool operator!=(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
bool operator<(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
bool operator>(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
bool operator<=(const ConstStrBlobPtr &, const ConstStrBlobPtr &);
bool operator>=(const ConstStrBlobPtr &, const ConstStrBlobPtr &);

inline const string &ConstStrBlobPtr::operator*() const {
  auto p = check(curr, "dereference past end");
  return (*p)[curr];
}

inline const string *ConstStrBlobPtr::operator->() const {
  return &this->operator*();
}

inline ConstStrBlobPtr &ConstStrBlobPtr::operator++() {
  check(curr, "increment past end of ConstStrBlobPtr");
  ++curr;
  return *this;
}

inline ConstStrBlobPtr &ConstStrBlobPtr::operator--() {
  --curr;
  check(-1, "decrement past begin of ConstStrBlobPtr");
  return *this;
}

inline ConstStrBlobPtr ConstStrBlobPtr::operator++(int) {
  ConstStrBlobPtr ret = *this;
  ++*this;
  return ret;
}

inline ConstStrBlobPtr ConstStrBlobPtr::operator--(int) {
  ConstStrBlobPtr ret = *this;
  --*this;
  return ret;
}

inline ConstStrBlobPtr &ConstStrBlobPtr::operator+=(size_t n) {
  curr += n;
  check(curr, "increment past end of ConstStrBlobPtr");
  return *this;
}

inline ConstStrBlobPtr &ConstStrBlobPtr::operator-=(size_t n) {
  curr -= n;
  check(curr, "increment past end of ConstStrBlobPtr");
  return *this;
}

inline ConstStrBlobPtr ConstStrBlobPtr::operator+(size_t n) const {
  ConstStrBlobPtr ret = *this;
  ret += n;
  return ret;
}

inline ConstStrBlobPtr ConstStrBlobPtr::operator-(size_t n) const {
  ConstStrBlobPtr ret = *this;
  ret -= n;
  return ret;
}

inline std::shared_ptr<vector<string>>
ConstStrBlobPtr::check(size_t i, const string &msg) const {
  auto ret = wptr.lock();
  if (!ret)
    throw std::runtime_error("unbound StrBlobPtr");
  if (i >= ret->size())
    throw std::out_of_range(msg);
  return ret;
}

inline const string &ConstStrBlobPtr::operator[](size_t n) const {
  auto p = check(n, "dereference out of range.");
  return (*p)[n];
}

#endif // CP5_STRBLOB_H_