标签:out 定义 names define code microsoft 数组 mic div
#ifndef _ARRAY_H_
#define _ARRAY_H_
template
< typename T, int N >
class Array
{
T m_array[N];
public:
int length();
bool set(int index, T value);
bool get(int index, T& value);
T& operator[] (int index);
T operator[] (int index) const; //数组类对象有可能是const的,此时只能调用const成员函数。
virtual ~Array();
};
template
< typename T, int N >
int Array<T, N>::length()
{
return N;
}
template
< typename T, int N >
bool Array<T, N>::set(int index, T value)
{
bool ret = (0 <= index) && (index < N);
if( ret )
{
m_array[index] = value;
}
return ret;
}
template
< typename T, int N >
bool Array<T, N>::get(int index, T& value)
{
bool ret = (0 <= index) && (index < N);
if( ret )
{
value = m_array[index];
}
return ret;
}
template
< typename T, int N >
T& Array<T, N>::operator[] (int index)
{
return m_array[index];
}
template
< typename T, int N >
T Array<T, N>::operator[] (int index) const //既然是const的,这里只能返回值,不能返回引用。
{
return m_array[index];
}
template
< typename T, int N >
Array<T, N>::~Array()
{
}
#endif
优化之前的IntArray类
#ifndef _HEAPARRAY_H_
#define _HEAPARRAY_H_
template
< typename T >
class HeapArray
{
private:
int m_length;
T* m_pointer;
HeapArray(int len);
HeapArray(const HeapArray<T>& obj);
bool construct();
public:
static HeapArray<T>* NewInstance(int length);
int length();
bool get(int index, T& value);
bool set(int index ,T value);
T& operator [] (int index);
T operator [] (int index) const;
HeapArray<T>& self();
~HeapArray(); //因为上面的构造函数被定义成了private,说明我不希望被继承,因此就不需要写virtual了
};
template
< typename T >
HeapArray<T>::HeapArray(int len)
{
m_length = len;
}
template
< typename T >
bool HeapArray<T>::construct()
{
m_pointer = new T[m_length];
return m_pointer != NULL;
}
template
< typename T >
HeapArray<T>* HeapArray<T>::NewInstance(int length)
{
HeapArray<T>* ret = new HeapArray<T>(length);
if( !(ret && ret->construct()) )
{
delete ret;
ret = 0;
}
return ret;
}
template
< typename T >
int HeapArray<T>::length()
{
return m_length;
}
template
< typename T >
bool HeapArray<T>::get(int index, T& value)
{
bool ret = (0 <= index) && (index < length());
if( ret )
{
value = m_pointer[index];
}
return ret;
}
template
< typename T >
bool HeapArray<T>::set(int index, T value)
{
bool ret = (0 <= index) && (index < length());
if( ret )
{
m_pointer[index] = value;
}
return ret;
}
template
< typename T >
T& HeapArray<T>::operator [] (int index)
{
return m_pointer[index];
}
template
< typename T >
T HeapArray<T>::operator [] (int index) const
{
return m_pointer[index];
}
template
< typename T >
HeapArray<T>& HeapArray<T>::self()
{
return *this;
}
template
< typename T >
HeapArray<T>::~HeapArray()
{
delete[]m_pointer;
}
#endif
#include <iostream>
#include <string>
#include "Array.h"
#include "HeapArray.h"
using namespace std;
int main()
{
Array<double, 5> ad;
for(int i=0; i<ad.length(); i++)
{
ad[i] = i * i;
}
for(int i=0; i<ad.length(); i++)
{
cout << ad[i] << endl;
}
cout << endl;
HeapArray<char>* pai = HeapArray<char>::NewInstance(10);
if( pai != NULL )
{
HeapArray<char>& ai = pai->self();
for(int i=0; i<ai.length(); i++)
{
ai[i] = i + ‘a‘;
}
for(int i=0; i<ai.length(); i++)
{
cout << ai[i] << endl;
}
}
delete pai;
return 0;
}
小结:
模板参数可以是数值型参数
数值型模板参数必须在编译期间唯一确定
数组类模板是基于数值型模板参数实现的
数组类模板是简易的线性表数据结构
标签:out 定义 names define code microsoft 数组 mic div
原文地址:https://www.cnblogs.com/-glb/p/12000177.html