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ex14_26_StrBlob.h
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ex14_26_StrBlob.h
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/*
=================================================================================
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<[email protected]>
=================================================================================
*/
#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& incr();
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::incr()
{
check(curr, "increment past end of StrBlobPtr");
++curr;
return *this;
}
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& deref() const;
ConstStrBlobPtr& incr();
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::deref() const
{
auto p = check(curr, "dereference past end");
return (*p)[curr];
}
inline ConstStrBlobPtr& ConstStrBlobPtr::incr()
{
check(curr, "increment past end of StrBlobPtr");
++curr;
return *this;
}
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_