[OOP]类模板

main.c

#include <stdio.h>
#include <string.h>

#include "Array.h"

int main()
{
    Array<int> a; // 长度可变的数组
    a.PushBack(1);
    a.PushBack(2);
    a.PushBack(3);
    a.PushBack(4);
    a.PushBack(5);

    int size = a.Size();

    Array<float> b;
    b.PushBack(2.3f);

    return 0;
}

Aarry.h

#ifndef _ARRAY_H
#define _ARRAY_H

// 用于存放double类型的对象
template <typename _TT>
class Array
{
public:
    Array(int capacity=4)
    {
        m_buffer = new _TT[capacity];
        m_capacity = capacity;
        m_size = 0;
    }

    void PushBack(_TT val)
    {
        if(m_size >= m_capacity)
        {
            Resize();
        }
        m_buffer[m_size] = val;
        m_size ++;
    }
    int Capacity()
    {
        return m_capacity;
    }
    int Size()
    {
        return m_size;
    }

private:
    void Resize()
    {
        // 创建一个更大的缓冲区
        int n = m_capacity + 4;
        _TT* buf = new _TT[n];

        // 拷贝原有的内容
        memcpy(buf, m_buffer, m_capacity * sizeof(_TT) );

        // 删除旧的内容,释放其内存
        delete [] m_buffer;

        // 更新一下成员变量
        m_capacity = n;
        m_buffer = buf;
    }

private:
    _TT* m_buffer;
    int m_capacity; // 容量
    int m_size; // 已经存放的对象的个数
};


#endif