Question

There is a function I want to use that takes char str[] as a parameter. I want to call the function giving a string input.

void someFunction (char str[]) {
    /* ... */
}

// Works.
someFunction("1010101");

// Does not work.
string someString;
someFunction(someString); 

How can I get the second call to work?

EDIT: I cannot change the function’s input parameters.

Answer 1

You should be able to do:

someFunction(const_cast<char*>(someString.c_str()));

Although I’m not sure what will happen if str gets modified.

It’s probably best if you just modify the original function to take a different parameter type.