sending a 'const char*' parameter to a function that recives 'const char* &'

why is this not OK?

void func(const char* &pointer){...}

//in main
const char* mainPointer = "a word";

my intention is to send a pointer to a function, that changes it(the pointer) but doesn't change the chars it is pointing to.


The following code (MS Visual C++ 2010) shows that it is perfectly possible and works. The output is: "World!"

#include "stdafx.h"
#include <iostream>
using namespace std;

void func(const char*& ptr) 
    ptr += 6;

int _tmain(int argc, _TCHAR* argv[])
    const char* Ptr = "Hello World!";
    cout << Ptr << endl;
    return 0;

Note that in contrast to Null Voids code, we do modify the pointer within func here.

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