typedef struct + assignments

[Troy Martin]

Hey all,

I was wondering if anyone knew how to do something like this:

Code: Select all

typedef struct
{
    int length = strlen(this); /* get the length of the string pointed to by the variable declared here */
} *string_sz;

string_sz str = "Hello World!\n";

So str is a pointer to a C string and length is the string's length.

Will that work or do I have some modifications to make to get it to work like a string from the C++ string library?

[JohnnyTheDon]

No, it won't work . You need a bunch of functions in a class to do this kind of thing.

Code: Select all

class sz_string
{
public:
    String(const char* str="") { mString = str; mLength = strlen(str); }
    operator const char*() const { return mString; }
    int Length() const { return mLength; }
protected:
    const char* mString;
    int mLength;
}

If you're trying to do this in C, AFAIK it isn't possible.

[Creature]

What JohnnyTheDon says. You can pretty much not do that in C, because C doesn't support (as far as I know) nor operator overloading, nor functions in structures.

[01000101]

AFAIK you're stuck with using plain ol' char arrays and using strlen(x). =)

[Troy Martin]

Yuck, this sucks.

Oh well, thanks anyways!

[JamesM]

Think about it - if you change the value of the char* member, how would the length member update? C has no runtime support system.

[Love4Boobies]

JamesM made the same point I wanted to make but here's another - WHY would this ever be needed?

[JohnnyTheDon]

Getting the length of a string with running strlen every time.

[Love4Boobies]

Well it's not stored anywhere. If you want this to happen, just make sure you update a variable with the length of the string each time you change it.

EDIT: Or you Pascal

[Combuster]

or link to the freebasic runtime (written in C ) and use that string format + functions

In the end, it all boils down to the same thing...

[Love4Boobies]

In the end, it all boils down to the same thing...

Boobies?

Sorry, couldn't help it...

[Combuster]

Also an option, but it only circumvents the problem by not having to write code