c struct queue error: "array type has incomplete element type"

Question

I'm trying to implement a simple priority queue from array of queues. I'm trying to define a struct queue, and than a struct priority queue that has an array of queues as its member variable. However, when I try to compile the code, I get the following error:

pcb.h:30: error: array type has incomplete element type

The code is below:

typedef struct{
    pcb *head;
    pcb *tail;
    SINT32 size;
} pcb_Q;

typedef struct {
 struct pcb_Q queues[5];
 SINT32 size;
} pcb_pQ;

Could someone give me a hand? Thanks a lot.

You cite an error on line 30. But don't provide enough context to know the line numbers. Please make the line-numbering clear, and make sure you include line 30. — abelenky
– abelenky, Commented May 24, 2010 at 5:22

zs2020 · Accepted Answer · 2010-05-24 05:22:53Z

3

You already typedef the pcb_Q, no need to use struct keyword any more. Just use this:

typedef struct { 
    pcb_Q queues[5]; 
    SINT32 size; 
} pcb_pQ;

answered May 24, 2010 at 5:22

zs2020

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Matthew Flaschen · Accepted Answer · 2010-05-24 05:22:13Z

1

typedef struct {
 pcb_Q queues[5];
 SINT32 size;
} pcb_pQ;

Your struct type has no name. Only the typedef is called pcb_Q.

answered May 24, 2010 at 5:22

Matthew Flaschen

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Comments

abelenky · Accepted Answer · 2010-05-24 05:23:42Z

1

I don't like this line:

struct pcb_Q queues[5];

Which references structure pcb_Q.

You have not defined pcb_Q as a structure. Instead, you typedef'd pcb_Q as a new type (which happens to be an un-named struct).

Try this instead:

pcb_Q queues[5];

answered May 24, 2010 at 5:23

abelenky

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