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05.07.2008 at 02:55PM PDT, ID: 23384435
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Can a function return structure?
Please consider following code Snippet:

typedef struct customer_no_type_s
{
   unsigned len ;
   unsigned char str[30];
} customer_no_type;

customer_no_type get_customer_pn(void)
{
    customer_no_type return_val;
 
    return_val.len = 16;
    return_val.str = "0000000000000000/000";

    return (return_val);  
}

Would above work if calling function assigns returned value to some variable of type customer_no_type.
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Question Stats
Zone: Programming
Question Asked By: naseeam
Solution Provided By: Infinity08
Participating Experts: 3
Solution Grade: A
Views: 15
Translate:
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05.07.2008 at 02:58PM PDT, ID: 21520701

Rank: Sage

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05.07.2008 at 02:58PM PDT, ID: 21520703

Rank: Wizard

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05.07.2008 at 02:59PM PDT, ID: 21520715

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05.07.2008 at 03:03PM PDT, ID: 21520740

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05.08.2008 at 07:41AM PDT, ID: 21525143

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05.08.2008 at 07:47AM PDT, ID: 21525198

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05.07.2008 at 02:58PM PDT, ID: 21520701

Rank: Sage

Yes. But you probably shouldn't, because the whole struct will be copied. Consider something like this instead for example :

void get_customer_pn(customer_no_type *cust)
{
    cust->len = 16;
    strcpy(cust->str, "0000000000000000/000");
}

Notice the use of strcpy instead of assignment btw.
Accepted Solution
 
05.07.2008 at 02:58PM PDT, ID: 21520703

Rank: Wizard

If I understand your question, Yes
Assisted Solution
 
05.07.2008 at 02:59PM PDT, ID: 21520715

Rank: Sage

Oh, and that would be called like this :

        customer_no_type cust;
        get_customer_pn(&cust);
 
05.07.2008 at 03:03PM PDT, ID: 21520740
>>return_val.str = "0000000000000000/000";

That won't work - use something like strcpy.

Is this really the question though?
Assisted Solution
 
05.08.2008 at 07:41AM PDT, ID: 21525143
I believe the only advantage of passing pointer to a structure is that stack space is saved.  If structure is copied, then it's necessary to have local copy of structure in stack.  Is that why suggestion is to pass pointer to a structure.
 
05.08.2008 at 07:47AM PDT, ID: 21525198

Rank: Sage

I suggested using a pointer because of the memory copy when the function returns. Memory copies can be pretty expensive, especially if the struct is a big struct.

If you pass a pointer to the struct as argument, then the function will fill the data immediately in the correct memory location, and no copying will be needed when the function returns.
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628