justhomework/DataStructure/Code/ex9/vector.hpp

#ifndef _VECTOR_HPP_
#define _VECTOR_HPP_

#include <iostream>

template <class T>
class Vector
{
private:
  T *_v;
  int _len;
  int _used;
  bool _sorted = false;

  void expand();
  void shrink();
  void adjust();

public:

  Vector(int len)
  {
    _used = 0;
    _len = len;
    _v = new int[_len];
  }
  Vector()
  {
    _used = 0;
    _len = 10;
    _v = new int[_len];
  }

  T get(int a){return _v[a];}
  T operator[](int i){return _v[i];}

  //排序搜索，返回秩
  int search(T value);
  
  void put(int a, int value);

  void swap(int a, int b);

  int insert(int locate, int value);

  int remove(int locate, int value);

  int remove_sorted(int value);

  int find(int value);

  void bubbleSort();

  void printall();

  int getlen();

  int getused();

  int count(int value);

  void mergeSort(int lo, int hi);

private:
  void merge(int lo, int mi, int hi);
};




template <class T>
void Vector<T>::expand()
{
  _len = _len * 2;
  T *p = new T[_len];

  for (int i = 0; i <= _used; i++)
    p[i] = _v[i];

  delete[] _v;
  _v = p;
}
template <class T>
void Vector<T>::shrink()
{
  _len = _len >> 1;
  T *p = new T[_len];

  for (int i = 0; i <= _used; i++)
    p[i] = _v[i];

  delete[] _v;
  _v = p;
}
template <class T>
void Vector<T>::adjust()
{
  if (((double)_used / (double)_len) < 0.25)
    shrink();
  else if (((double)_used / (double)_len) > 0.75)
    expand();
  return;
}


template <class T>
int Vector<T>::search(T e)
{
    if (_sorted == false)
        return -1;

    int i = 0;
    for (; i <= _used && _v[i] <= e; i++)
        ;

    return i - 1;
}

#endif