问当函数/方法需要*或&时

EN

#include <iostream>
#include <string.h>

using namespace std;

class MyString
{
private:
    char* buffer;

public:
    //Constructor
    MyString(const char* initString)
    {
        if(initString != NULL)
        {
            buffer = new char[strlen(initString)+1];
            strcpy(buffer, initString);
        }
        else
            buffer = NULL;
    }
    //Destructor
    ~MyString()
    {
        cout << "Invoking destructor, clearing up\n";
        if (buffer != NULL)
            delete [] buffer;
    }

    int GetLength()
    {
        return strlen(buffer);
    }

    const char* GetString()
    {
        return buffer;
    }
};

int main()
{
    MyString SayHello("Hello from String Class");
    cout << "String buffer in MyString is " << SayHello.GetLength();
    cout << " characters long\n";

    cout << "Buffer contains: " << SayHello.GetString() << endl;

    return 0;
}