Pointer to c++ string

Question

Hi, in the following code, I am using a pointer to a c++ string in the change() function.

Is there anyway to use the string class' operators when working with a pointer to a string? For example, at() works for the [] operator, but is there any way to use the [] operator?

#include <string>
#include <iostream>

using namespace std;

void change(string * s){

    s->at(0) = 't';
    s->at(1) = 'w';
    // s->[2] = 'o'; does not work
    // *s[2] = 'o'; does not work


}

int main(int argc,char ** argv){

    string s1 = "one";

    change(&s1);

    cout << s1 << endl;

    return 0;
}

Answer 1

you're running into an operator precedence issue, try

(*s)[0]

Answer 2

Dereference it:

(*myString)[4]

But, may I suggest instead of a pointer, using a reference:

void change(string &_myString){
    //stuff
}

That way you can use everything like you would with the object.

Answer 3

First and foremost, no reason to pass a std::string by pointer here, use a reference. Secondly, I think this could work:

(*s)[i]

But better would be:

void change( string &s )
{
    s.at(0) = 't';
    s.at(1) = 'w';
    s[2] = 'o';
    s[2] = 'o';    
}

Cuts down on dereferencing as well.

Answer 4

Another solution, for completeness' sake:

s->operator[](2) = 'o';