C++ 中const修饰虚函数实例详解

网络转载  2017-06-01   投稿:lqh   [简洁网络]

本文作者主要介绍了C++ 中const修饰虚函数实例详解的相关资料,需要的朋友可以参考下

C++ 中const修饰虚函数实例详解

【1】程序1

#include <iostream>
using namespace std;
class Base
{
public:
 virtual void print() const = 0;
};
class Test : public Base
{
public:
 void print();
};
void Test::print()
{
 cout << "Test::print()" << endl;
}
void main()
{
 // Base* pChild = new Test(); //compile error!
 // pChild->print();
}

【2】程序2

#include <iostream>
using namespace std;
class Base
{
public:
 virtual void print() const = 0;
};
class Test : public Base
{
public:
 void print();
 void print() const;
};
void Test::print()
{
 cout << "Test::print()" << endl;
}
void Test::print() const
{
 cout << "Test::print() const" << endl;
}
void main()
{
 Base* pChild = new Test();
 pChild->print();
}
/*
Test::print() const
*/

【3】程序3

#include <iostream>
using namespace std;
class Base
{
public:
 virtual void print() const = 0;
};
class Test : public Base
{
public:
 void print();
 void print() const;
};
void Test::print()
{
 cout << "Test::print()" << endl;
}
void Test::print() const
{
 cout << "Test::print() const" << endl;
}
void main()
{
 Base* pChild = new Test();
 pChild->print();
 const Test obj;
 obj.print();
 Test obj1;
 obj1.print();
 Test* pOwn = new Test();
 pOwn->print();
}
/*
Test::print() const
Test::print() const
Test::print()
Test::print()
*/

备注:一切皆在代码中。

总结:const修饰成员函数,也属于函数重载的一种范畴。

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