255 lines
5.7 KiB
C++
255 lines
5.7 KiB
C++
#include <cstdlib>
|
|
#include <memory>
|
|
#include <utility>
|
|
|
|
namespace phundrak {
|
|
|
|
using size_type = size_t;
|
|
|
|
template <class T, class Allocator = std::allocator<T>> class list {
|
|
private:
|
|
struct cell {
|
|
cell() = default;
|
|
cell *p;
|
|
cell *n;
|
|
T x;
|
|
};
|
|
cell *sentry;
|
|
|
|
public:
|
|
class iterator;
|
|
class const_iterator;
|
|
|
|
// Member types //////////////////////////////////////////////////////////////
|
|
|
|
list() : list{Allocator()}, sentry{new cell} {}
|
|
|
|
explicit list(const Allocator &alloc) {
|
|
sentry = new cell;
|
|
sentry->p = sentry;
|
|
sentry->n = sentry;
|
|
}
|
|
|
|
list(size_type count, const T &value, const Allocator &alloc = Allocator())
|
|
: list(alloc) {
|
|
while (size() < count)
|
|
push_back(value);
|
|
}
|
|
|
|
explicit list(size_type count, const Allocator &alloc = Allocator())
|
|
: list(alloc) {
|
|
while (size() < count)
|
|
push_back(T());
|
|
}
|
|
|
|
template <class InputIt>
|
|
list(InputIt first, InputIt last, const Allocator &alloc = Allocator())
|
|
: list(alloc) {
|
|
while (first != last)
|
|
push_back(*first);
|
|
}
|
|
|
|
list(const list &other) : list() {
|
|
for (auto elem : other)
|
|
push_back(elem);
|
|
}
|
|
|
|
list(const list &other, const Allocator &alloc) : list(alloc) {
|
|
for (auto elem : other)
|
|
push_back(elem);
|
|
}
|
|
|
|
list(list &&other) : list() { std::swap(other.sentry, sentry); }
|
|
|
|
list(list &&other, const Allocator &alloc) : list(alloc) {
|
|
std::swap(other.sentry, sentry);
|
|
}
|
|
|
|
list(std::initializer_list<T> init, const Allocator &alloc = Allocator())
|
|
: list(alloc) {
|
|
for (auto elem : init)
|
|
push_back(elem);
|
|
}
|
|
|
|
virtual ~list() {
|
|
clear();
|
|
delete sentry;
|
|
}
|
|
|
|
// Element access ////////////////////////////////////////////////////////////
|
|
|
|
T &front() const { return sentry->n->x; }
|
|
T &back() const { return sentry->p->x; }
|
|
|
|
// Iterators /////////////////////////////////////////////////////////////////
|
|
|
|
iterator begin() noexcept { return iterator{sentry->n}; }
|
|
|
|
const_iterator begin() const noexcept { return const_iterator{sentry->n}; }
|
|
const_iterator cbegin() const noexcept { return const_iterator{sentry->n}; }
|
|
|
|
iterator end() noexcept { return iterator{sentry}; }
|
|
const_iterator end() const noexcept { return const_iterator{sentry}; }
|
|
const_iterator cend() const noexcept { return const_iterator{sentry}; }
|
|
|
|
// Capacity //////////////////////////////////////////////////////////////////
|
|
|
|
// Modifiers /////////////////////////////////////////////////////////////////
|
|
|
|
void clear() {
|
|
cell *it = sentry->n;
|
|
while (it != sentry) {
|
|
cell *todel = it;
|
|
it = it->n;
|
|
delete todel;
|
|
}
|
|
}
|
|
|
|
list &operator=(const list &other) {
|
|
cell *it = other.sentry->n;
|
|
while (it != other.sentry) {
|
|
push_back(it->x);
|
|
it = it->n;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
list &operator=(list &&other) noexcept {
|
|
std::swap(other.sentry, sentry);
|
|
return *this;
|
|
}
|
|
|
|
list &operator=(std::initializer_list<T> ilist) {
|
|
for (auto elem : ilist)
|
|
push_back(elem);
|
|
return *this;
|
|
}
|
|
|
|
bool empty() { return sentry->p == sentry; }
|
|
|
|
size_type size() const {
|
|
cell *it = sentry->n;
|
|
size_type n = 0;
|
|
while (it != sentry) {
|
|
++n;
|
|
it = it->n;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
void push_front(const T &v) {
|
|
cell *c = new cell;
|
|
c->x = v;
|
|
c->n = sentry->n;
|
|
c->p = sentry;
|
|
sentry->n->p = c;
|
|
sentry->n = c;
|
|
}
|
|
|
|
void push_back(const T &v) {
|
|
cell *c = new cell;
|
|
c->x = v;
|
|
c->p = sentry->p;
|
|
c->n = sentry;
|
|
sentry->p->n = c;
|
|
sentry->p = c;
|
|
}
|
|
|
|
void pop_front() {
|
|
cell *c = sentry->n;
|
|
sentry->n = c->n;
|
|
c->n->p = sentry;
|
|
delete c;
|
|
}
|
|
|
|
void pop_back() {
|
|
cell *c = sentry->p;
|
|
sentry->p = c->p;
|
|
c->p->n = sentry;
|
|
delete c;
|
|
}
|
|
|
|
class iterator {
|
|
public:
|
|
iterator() : it{nullptr} {}
|
|
explicit iterator(cell *point) : it{point} {}
|
|
|
|
iterator(const iterator &other) : it{other.it} {}
|
|
|
|
iterator(iterator &&other) { std::swap(it, other.it); }
|
|
|
|
iterator &operator=(cell *point) {
|
|
it = point;
|
|
return *this;
|
|
}
|
|
iterator &operator=(const iterator &other) {
|
|
it = other.it;
|
|
return *this;
|
|
}
|
|
iterator &operator=(iterator &&other) {
|
|
std::swap(it, other.it);
|
|
return *this;
|
|
}
|
|
|
|
~iterator() {}
|
|
|
|
iterator &operator++() { // ++i
|
|
it = it->n;
|
|
return *this;
|
|
}
|
|
iterator &operator++(int) { // i++
|
|
iterator t;
|
|
t.it = it;
|
|
// iterator t{*this};
|
|
it = it->n;
|
|
return t;
|
|
}
|
|
|
|
iterator &operator--() { // --i
|
|
it = it->p;
|
|
return *this;
|
|
}
|
|
|
|
iterator &operator--(int) { // i--
|
|
iterator t;
|
|
t.it = it;
|
|
it = it->n;
|
|
return t;
|
|
}
|
|
|
|
bool operator==(cell *point) { return point == it; }
|
|
bool operator==(const iterator &other) { return other.it = it; }
|
|
bool operator==(iterator &&other) { return other.it == it; }
|
|
|
|
bool operator!=(cell *point) { return point != it; }
|
|
bool operator!=(const iterator &other) { return other.it != it; }
|
|
bool operator!=(iterator &&other) { return other.it != it; }
|
|
|
|
T operator*() { return it->x; }
|
|
|
|
protected:
|
|
cell *it;
|
|
};
|
|
|
|
class const_iterator : protected iterator {
|
|
public:
|
|
const_iterator() : iterator() {}
|
|
explicit const_iterator(T *point) : iterator(point) {}
|
|
|
|
explicit const_iterator(const iterator &other) : iterator(other) {}
|
|
const_iterator(const const_iterator &other) : iterator(other) {}
|
|
|
|
explicit const_iterator(iterator &&other) : iterator(std::move(other)) {}
|
|
const_iterator(const_iterator &&other) : iterator(std::move(other)) {}
|
|
|
|
const_iterator &operator++() = delete;
|
|
const_iterator &operator++(int) = delete;
|
|
const_iterator &operator--() = delete;
|
|
const_iterator &operator--(int) = delete;
|
|
|
|
~const_iterator() {}
|
|
};
|
|
};
|
|
|
|
} // namespace phundrak
|