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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