vector
vector 模拟
#pragma once
#include
#include "ReverseIterator.h"
namespace sjy
{
template <typename T>
class vector
{
public:
typedef T* iterator;
typedef const T* const_iterator;
typedef Reverse_iterator<iterator, T&, T*> reverse_iterator;
typedef Reverse_iterator<const_iterator, const T&, const T*> const_reverse_iterator;
iterator begin()
{
return _start;
}
iterator end()
{
return _finish;
}
const_iterator begin() const
{
return _start;
}
const_iterator end() const
{
return _finish;
}
reverse_iterator rbegin()
{
return reverse_iterator(end());
}
reverse_iterator rend()
{
return reverse_iterator(begin());
}
const_reverse_iterator rbegin() const
{
return const_reverse_iterator(end());
}
const_reverse_iterator rend() const
{
return const_reverse_iterator(begin());
}
vector()
:_start(nullptr)
, _finish(nullptr)
, _endofstorage(nullptr)
{}
vector(size_t n, const T& x = T())
:_start(nullptr)
, _finish(nullptr)
, _endofstorage(nullptr)
{
resize(n, x);
}
vector(int n, const T& x = T())
:_start(nullptr)
, _finish(nullptr)
, _endofstorage(nullptr)
{
resize(n, x);
}
template <typename InputIterator>
vector(InputIterator first, InputIterator last)
{
while (first != last)
{
push_back(*first);
first++;
}
}
~vector()
{
delete[] _start;
}
vector(const vector<T>& other)
{
_start = new T[other.capacity()];
_finish = _start + other.size();
_endofstorage = _start + other.capacity();
for (int i = 0; i < other.size(); i++)
{
*(_start + i) = *(other._start + i);
}
}
vector<T>& operator=(vector<T> other)
{
swap(other);
return *this;
}
size_t size() const
{
return _finish - _start;
}
size_t capacity() const
{
return _endofstorage - _start;
}
void resize(size_t n, const T& x = T())
{
if (n < size())
{
_finish = _start + n;
}
else
{
reserve(n);
while (_finish != _start + n)
{
*_finish = x;
_finish++;
}
}
}
void reserve(size_t n)
{
if (n > capacity())
{
size_t sz = size();
T* tmp = new T[n];
if (_start != nullptr)
{
for (int i = 0; i < sz; i++)
{
*(tmp + i) = *(_start + i);
}
delete[] _start;
}
_start = tmp;
_finish = _start + sz;
_endofstorage = _start + n;
}
}
T& operator[](size_t pos)
{
assert(pos < size());
return *(_start + pos);
}
const T& operator[](size_t pos) const
{
assert(pos < size());
return *(_start + pos);
}
void push_back(const T& x)
{
if (_finish == _endofstorage)
{
reserve(capacity() == 0 ? 4 : 2 * capacity());
}
*_finish = x;
_finish++;
}
iterator insert(iterator pos, const T& x)
{
assert(pos >= _start && pos <= _finish);
if (_finish == _endofstorage)
{
size_t len = pos - _start;
reserve(capacity() == 0 ? 4 : 2 * capacity());
pos = _start + len;
}
for (auto it = _finish; it > pos; it--)
{
*it = *(it - 1);
}
*pos = x;
_finish++;
return pos;
}
iterator erase(iterator pos)
{
assert(pos >= _start && pos < _finish);
for (auto it = pos; it < _finish - 1; it++)
{
*it = *(it + 1);
}
_finish--;
return pos;
}
void pop_back()
{
erase(end() - 1);
}
void swap(vector<T>& v)
{
std::swap(_start, v._start);
std::swap(_finish, v._finish);
std::swap(_endofstorage, v._endofstorage);
}
private:
iterator _start;
iterator _finish;
iterator _endofstorage;
};
}
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