creating Typedef pointers to Typedef structs in C

Question

Have a question about typedef in C.

I have defined struct:

typedef struct Node { int data; struct Node *nextptr; } nodes;

How would I create typedef pointers to struct Node ??

Thanks !

Possible duplicate of C typedef of pointer to structure

Evan Carroll
– Evan Carroll

2019-01-28 21:22:30 +00:00
Commented Jan 28, 2019 at 21:22 — Evan Carroll
– Evan Carroll, Commented Jan 28, 2019 at 21:22

Karl Knechtel · Accepted Answer · 2010-12-19 15:53:22Z

You can typedef them at the same time:

typedef struct Node { int data; struct Node *nextptr; } node, *node_ptr;

This is arguably hard to understand, but it has a lot to do with why C's declaration syntax works the way it does (i.e. why int* foo, bar; declares bar to be an int rather than an int*

Or you can build on your existing typedef:

typedef struct Node { int data; struct Node *nextptr; } node; typedef node* node_ptr;

Or you can do it from scratch, the same way that you'd typedef anything else:

typedef struct Node* node_ptr;

Jens Gustedt · Accepted Answer · 2010-12-19 09:58:29Z

To my taste, the easiest and clearest way is to do forward declarations of the struct and typedef to the struct and the pointer:

typedef struct node node; typedef node * node_ptr; struct node { int data; node_ptr nextptr; };

Though I'd say that I don't like pointer typedef too much.

Using the same name as typedef and struct tag in the forward declaration make things clearer and eases the API compability with C++.

Also you should be clearer with the names of your types, of whether or not they represent one node or a set of nodes.

Etienne de Martel · Accepted Answer · 2010-12-19 04:34:45Z

Like so:

typedef nodes * your_type;

Or:

typedef struct Node * your_type;

But I would prefer the first since you already defined a type for struct Node.

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