线性表Vector

#ifndef SJTU_VECTOR_HPP
#define SJTU_VECTOR_HPP

#include <cstddef>
#include <cstring>
#include <string>
#include <cstdlib>
#include <vector>
#include <climits>
#include <cstddef>
namespace sjtu {
class exception 
{
protected:
		const std::string variant = "";
		std::string detail = "";
public:
		exception() {}
		exception(const exception &ec) : variant(ec.variant), detail(ec.detail) {}
		virtual std::string what() {
			return variant + " " + detail;
		}
};
class index_out_of_bound : public exception {};
class runtime_error : public exception {};
class invalid_iterator : public exception {};
class container_is_empty : public exception {};

template<typename T>
class vector {
private:
	T* data;
	size_t currentsize;
	size_t maxsize;
	void delete00()
    {
		for (size_t i = 0; i != maxsize; ++i)
		{
			data[i].~T();
		}
        free(data);
    }
public:
	class const_iterator;
	class iterator;
	void doublespace();
	vector(int inputsize = 10);
	vector(const vector<T> &other);
	vector(const std::vector<T> &other);
	~vector() {delete00();}
	vector<T>& operator=(const vector<T> &other);
	T & at(const size_t &pos);
	const T & at(const size_t &pos) const;
	T & operator[](const size_t &pos);
	const T & operator[](const size_t &pos) const;
	const T & front() const;
	const T & back() const;
	bool empty() const;
	size_t size() const;
	size_t capacity() const;
	void clear();
	void push_back(const T &value);
	void pop_back();
	iterator begin() 
	{
	 return iterator(this,0);
	}
	const_iterator cbegin() const {
	 return const_iterator(this,0);
	}
	iterator end() 
	{
		return iterator(this,currentsize);
	}
	const_iterator cend() const 
	{
		return const_iterator(this,currentsize);
	}
	iterator insert(iterator it, const T &value) 
	{
		if(currentsize>=maxsize)
		{
			doublespace();
		}
		size_t inipos = it.thepos();
		iterator right=iterator(this,currentsize);
		while(right.thepos()>it.thepos())
		{
			*right=*(right-1);
			right --;
		}
		data[inipos] = value;
		currentsize ++;
		return it;
	}
	iterator insert(const size_t &ind, const T &value) 
	{
		if(currentsize>=maxsize)
		{
			doublespace();
		}
		if(ind>currentsize)
		{
			throw index_out_of_bound();
		}
		size_t right = currentsize;
		while(right>ind)
		{
			data[right]=data[right-1];
			right--;
		}
		data[right-1]=value;
		iterator tmp=iterator(this,right-1);
		currentsize ++;
		return tmp;
	}
	iterator erase(iterator it) 
	{
		size_t tmp = it.thepos();
		size_t theend = currentsize-1;
		while(tmp<theend)
		{
			data[tmp]=data[tmp+1];
			tmp++;
		}
		currentsize--;
		return iterator(this,it.thepos());
	}
	iterator erase(const size_t &ind) 
	{
		size_t k = ind;
		while(k<currentsize-1)
		{
			data[k]=data[k+1];
		}
		currentsize--;
		return iterator(this,ind);
	}
};
template <typename T>
class vector<T>::const_iterator
{
private:
		vector* vec;
		size_t pos;
public:
		vector* thevec()
		{
			return vec;
		}
		size_t thepos()
		{
			return pos;
		}
		const_iterator(vector* inputvec, size_t inputpos)
		{
			vec = inputvec;
			pos = inputpos;
		}
		const_iterator(const vector* ptrvec, size_t ptrpos) : vec(const_cast<vector *>(ptrvec)), pos(ptrpos) {}
		const_iterator operator+(const int &n) const 
		{
			return const_iterator(vec, pos + n);
		}
		const_iterator operator-(const int &n) const 
		{
			pos -= n;
			return *this;
		}
		int operator-(const iterator &rhs) const 
		{
			if (vec != rhs.vec)
			{
				throw invaild_iterator();
			}
			return rhs.pos - pos;
		}
		const_iterator operator+=(const int &n) 
		{
			pos += n;
			return *this;
		}
		const_iterator operator-=(const int &n) 
		{
			pos -= n;
			return *this;
		}
		const_iterator operator++(int)
		{
			size_t ii = pos;
			++pos;
			return const_iterator(vec, ii);
		}
		const_iterator& operator++() 
		{
			pos++;
			return *this;
		}
		const_iterator operator--(int) 
		{
			const_iterator it(vec, pos);
			pos--;
			return it;;
		}
		const_iterator& operator--() 
		{
			pos--;
			return *this;
		}
		const T& operator*() const 
		{
			return vec->data[pos];
		}
		bool operator==(const iterator &rhs) const 
		{
			return rhs.vec == vec&&rhs.pos == pos;
		}
		bool operator==(const const_iterator &rhs) const 
		{
			return rhs.vec == vec&&rhs.pos == pos;
		}
		bool operator!=(const iterator &rhs) const 
		{
			return !(*this == rhs);
		}
		bool operator!=(const const_iterator &rhs) const 
		{
			return !(*this == rhs);
		}
};
template <typename T>
class vector<T>::iterator
{
	private:
		vector* vec;
		size_t pos;

	public:
		vector* thevec()
		{
			return vec;
		}
		size_t thepos()
		{
			return pos;
		}
		iterator(vector* inputvec, size_t inputpos)
		{
			vec = inputvec;
			pos = inputpos;
		}
		iterator operator+(const int &n) const 
		{
			return iterator(vec, pos + n);
		}
		iterator operator-(const int &n) const 
		{
			return iterator(vec, pos - n);
		}

		int operator-(const iterator &rhs) const 
		{
			if (vec != rhs.vec)
			{
				throw invaild_iterator();
			}
			return rhs.pos - pos;
		}
		iterator operator+=(const int &n) 
		{
			pos += n;
			return *this;
		}
		iterator operator-=(const int &n) 
		{
			pos -= n;
			return *this;
		}
		iterator operator++(int) 
		{
			iterator it = iterator(vec, pos);
			pos++;
			return it;
		}

		iterator& operator++() 
		{
			pos++;
			return *this;
		}
		iterator operator--(int) 
		{
			iterator it(vec, pos);
			pos--;
			return it;
		}
		iterator& operator--() 
		{
			pos--;
			return *this;
		}
		T& operator*() const 
		{
			return vec->data[pos];
		}
		bool operator==(const iterator &rhs)
		{
			return (vec == rhs.vec && pos == rhs.pos);
		}
		bool operator==(const const_iterator &rhs)
		{
			return (vec == rhs.vec && pos == rhs.pos);
		}
		bool operator!=(const iterator &rhs) const 
		{
			return !(vec == rhs.vec && pos == rhs.pos);
		}
		bool operator!=(const const_iterator &rhs) const 
		{
			return !(vec == rhs.vec && pos == rhs.pos);
		}
};
template <class T>
void vector<T>::doublespace()
{
	T*p = (T*)malloc(maxsize * 2 * sizeof(T));
	memset(p, 0, maxsize * 2 * sizeof(T));
	for (int i = 0; i < currentsize; i++)
	{
		p[i] = data[i];
	}

	delete00();
	data = p;
	maxsize *= 2;
}
template<class T>
vector<T>::vector(int inputsize = 10) 
{
	currentsize = 0;
	maxsize = inputsize;
	data = (T *)malloc(maxsize * sizeof(T));
	memset(data, 0, maxsize * sizeof(T));
}
template <class T>
vector<T>::vector(const vector<T> &other)
{
	currentsize = other.currentsize;
	maxsize = other.maxsize;
	data = (T *)malloc(maxsize * sizeof(T));
	memset(data, 0, maxsize * sizeof(T));
	for (size_t i = 0; i < other.currentsize; i++)
	{
		data[i] = other[i];
	}

}
template <class T>
vector<T>::vector(const std::vector<T> &other)
{
	currentsize = other.size();
	maxsize = other.size();
	data = (T *)malloc(maxsize * sizeof(T));
	memset(data, 0, maxsize * sizeof(T));
	for (size_t i = 0; i < other.size(); i++)
	{
		data[i] = other[i];
	}

}
template <class T>
vector<T>& vector<T>::operator=(const vector<T> &other) 
{
	if (&other == this) return*this;
	T*p = (T*)malloc(maxsize * sizeof(T));
	memset(p, 0, maxsize * sizeof(T));
	for (int i = 0; i < other.currentsize; i++)
	{
		p[i] = other.data[i];
	}
	delete00();
	currentsize = other.currentsize;
	maxsize = other.maxsize;
	data = p;
	return *this;
}
template <class T>
T & vector<T>::at(const size_t &pos) 
{
	if (!(pos >= 0 && pos<currentsize))
	{
		throw index_out_of_bound();
	}
	else
	{
		return data[pos];
	}
}
template <class T>
const T & vector<T>::at(const size_t &pos) const 
{

	if (!(pos >= 0 && pos<currentsize))
	{
		throw index_out_of_bound();
	}
	else
	{
		return data[pos];
	}
}
template <class T>
T & vector<T>::operator[](const size_t &pos) 
{
	if (!(pos >= 0 && pos<currentsize))
	{
		throw index_out_of_bound();
	}
	else
	{
		return data[pos];
	}
}
template <class T>
const T & vector<T>::operator[](const size_t &pos) const 
{
	if (!(pos >= 0 && pos<currentsize))
	{
		throw index_out_of_bound();
	}
	else
	{
		return data[pos];
	}
}
template <class T>
const T & vector<T>::front() const 
{
	if (!currentsize)
	{
		throw container_is_empty();
	}
	else
	{
		return data[0];
	}
}
template <class T>
const T & vector<T>::back() const 
{
	if (!currentsize)
	{
		throw container_is_empty();
	}
	else
	{
		return data[currentsize - 1];
	}
}
template <class T>
bool vector<T>::empty() const
{
	return currentsize == 0;
}
template <class T>
size_t vector<T>::size() const
{
	return currentsize;
}
template <class T>
size_t vector<T>::capacity() const
{
	return maxsize;
}
template <class T>
void vector<T>::clear()
{
	currentsize = 0;
}
template <class T>
void vector<T>::push_back(const T &value)
{
	if (currentsize == maxsize)
	{
		doublespace();
	}
	data[currentsize++] = value;
}
template <class T>
void vector<T>::pop_back()
{
	currentsize--;
}
}
#endif