C++类模板学习

之前已经学习了函数模板，在这里，

C++函数模板Demo - win32 版_c++编写的opc da demo_bcbobo21cn的博客-CSDN博客

下面学习类模板；

VC6；

做一个星星类，Star；

Star.h；

#if !defined(AFX_STAR_H__97C0823A_2BCE_4D95_998D_D8C8D1A56308__INCLUDED_)
#define AFX_STAR_H__97C0823A_2BCE_4D95_998D_D8C8D1A56308__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

template<class T1, class T2>

class Star{

public:
    Star(T1 a, T2 b): size(a), light(b){ }
public:
    T1 getsize() const;  //获取大小
    void setsize(T1 a);  //设置大小
    T2 getlight() const;  //获取亮度
    void setlight(T2 b);  //设置亮度

private:
    T1 size;  //大小
    T2 light;  //亮度
};

template<class T1, class T2>  //模板头
T1 Star<T1, T2>::getsize() const /*函数头*/ {
    return size;
}

template<class T1, class T2>
void Star<T1, T2>::setsize(T1 a){
    size = a;
}

template<class T1, class T2>
T2 Star<T1, T2>::getlight() const{
    return light;
}

template<class T1, class T2>
void Star<T1, T2>::setlight(T2 b){
    light = b;
}

#endif // !defined(AFX_STAR_H__97C0823A_2BCE_4D95_998D_D8C8D1A56308__INCLUDED_)

OnDraw()函数中调用，

void CMystarView::OnDraw(CDC* pDC)
{
	CMystarDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	CString str1;

	Star<int, int> star1(10, 20);
	str1.Format("星星大小：%d，星星亮度：%d", star1.getsize(), star1.getlight());
	pDC->TextOut(50, 50, str1);

    Star<int, char*> star2(100, "180度");
    str1.Format("星星大小：%d，星星亮度：%s", star2.getsize(), star2.getlight());
	pDC->TextOut(50, 80, str1);

    Star<char*, char*> star3("六", "二十一度");
    str1.Format("星星大小：%s，星星亮度：%s", star3.getsize(), star3.getlight());
	pDC->TextOut(50, 110, str1);

	Star<double, double> star4(5.5, 97.5);
    str1.Format("星星大小：%f，星星亮度：%f", star4.getsize(), star4.getlight());
	pDC->TextOut(50, 140, str1);
}

运行如下；

有时候把几个成员函数单独放到Star.cpp里，在VC环境会报链接错误，一时还没明白；下回继续；

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