#if ! defined(_VECTOR_H_)
#define _VECTOR_H_

class vector {				// 向量類別
public:
    explicit vector(int n=10);
    vector(vector const & v);
    ~vector();
    vector & operator =(vector const & v);

    int size() const { return capacity; }
    double operator [](int n) const;	// 只讀不寫
    double & operator [](int n);	// 會修改到 *this

    typedef double * iterator;
    iterator begin() const { return data; }
    iterator end() const { return data + capacity; }

private:
    int capacity;			// 最多可以容納多少個元素
    double * data;			// 真正的資料. 動態地取得存放空間.
};

#endif

// 名稱: vector.cc
// 作者: 洪朝貴 http://www.cyut.edu.tw/~ckhung/
// 功能: 向量模組. 主要只在示範 constructor, copy constructor,
//	 destructor, assignment operator 之間的關係.

vector::vector(int n) : capacity(n), data(new double[n]) { }

vector::vector(vector const & v) :
    capacity(v.capacity), data(new double[v.capacity])
{
    for (int i=0; i<capacity; ++i)
	data[i] = v.data[i];
}

vector::~vector() { delete [] data; }

vector & vector::operator =(vector const & v)
{
    if (this == & v) return * this;
    if (capacity != v.capacity) {
	delete [] data;
	capacity = v.capacity;
	data = new double[capacity];
    }
    for (int i=0; i<capacity; ++i)
	data[i] = v.data[i];
    return * this;
}

double vector::operator [](int n) const
{
    return data[n];
}

double & vector::operator [](int n)
{
    return data[n];
}

#include <stdlib.h>
#include <iostream.h>

#if defined(TEST)

int main(int argc, char *argv[])
{
    int i;

    vector x(argc-1);
    for (i=1; i<argc; ++i)
	x[i-1] = atof(argv[i]);

    for (i=0; i<x.size(); ++i)
	cout << ' ' << x[i];
    cout << endl;

    vector::iterator p;
    for (p=x.begin(); p!=x.end(); ++p)
	cout << ' ' << (*p);
    cout << endl;

    return 0;
}

#endif