Thread: Problem with string*

okay, I've got a class with two pointers to strings, but I can't figure out how to call the length() function of the default string class (it exists doesn't it?). here's what I've been trying to do:

Code:

typedef string* strptr;

class Book
{
  public:
    //big 3
    ...
    ...
    Book(const Book& b1);
    //other functions, not important right now
    ...
  private:
    strptr title;
    strptr author;
    ...
};

//copy constuctor for class Book
Book::Book(const Book& b1)
{
  strptr t, a;

  t = b1.title;
  a = b1.author;

  title = new string[t.length()];
  author = new string[a.length()]; 
  ...
  ...
}

I'm compiling with g++ and I keep getting a syntax error that says:

error: 'length' has not been declared
error: request for member of non-aggregate type before '(' token

I also tried it with:

Code:

title = new string[t&.length()];
author = new string[a&.length()];

but that gives me this message:

error: expected primary-expression before '.' token

what am I doing wrong?

try with

Code:

t->length();
a->length();

Before you can access anything that a pointer points to you need to dereference the pointer, doing *somepointer.
After that you can use the . to access functions and membervariables. So, t->length() is the same as (*t).length().

thanks, it's compiling now, but now I'm getting a segmentation fault...

That can be because of many reasons but my guess would be that you are trying to access memory that you shouldnt access (or maybe you are trying to access a NULL-pointer).

yeah, that's what I have now, I'm new to using the string class so I wasn't sure how it worked