Linked Lists in C. error: conflicting types. Solution?

Question

i have the following struct defined:

typedef struct PList{
    Person person;
    struct PList *nextPerson;  //  set to NULL by default <<<<<
}PList;

and this method:

int length(struct PList* db){
    PList* cur = db;
    int size = 0;
    while (cur != NULL){
    ++size;
    cur = cur->nextPerson;
}
    return size;
}

error: conflicting types for 'length' is being thrown at the signature for the length method.

Any ideas?

You have a conflicting declaration or definition of length elsewhere in your code. — Fred Foo
– Fred Foo, Commented Nov 28, 2012 at 16:33
You have a function definition that does not match the function declaration signature — asheeshr
– asheeshr, Commented Nov 28, 2012 at 16:34

Aniket Inge · Accepted Answer · 2012-11-28 16:34:36Z

2

That actually means that there is another function/declaration called length elsewhere in your source code structure that has a different function signature.

Find where length() function is defined, and pass correct structure objects to that function(either of type struct PList or PList*)

answered Nov 28, 2012 at 16:34

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5 Comments

mangusbrother Over a year ago

So you cannot have 3 methods that take as parameters different structs? Overloading it kindof..

Paul R Over a year ago

No - not in C - you can in C++ though.

Aniket Inge Over a year ago

You cannot do function overloading in C. Its possible in C++ however

HostileFork says dont trust SE Over a year ago

In C++, while you can technically overload a global function (such as length) for different class types, one would generally make length a method of the class. So foo.length() is more idiomatic than length(foo)...*most* of the time.

mangusbrother Over a year ago

yes but i don't think it's possible to do anything of the sort since C isn't Object Oriented. I also don't think it's actually possible to implement it using something like a general struct since i don't think anything like inheritance is implemented for structs.

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