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Re: What is better and why?

 
 
Lew Pitcher
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      06-10-2013
On Sunday 09 June 2013 16:57, in comp.lang.c, http://www.velocityreviews.com/forums/(E-Mail Removed) wrote:

(implied from subject: Which of these four constructs is "better", and why?)

> 1st:
>
> struct person {
> char *name;
> char *surname;
> };
>
> 2nd:
>
> typedef struct {
> char *name;
> char *surnname;
> } person;
>
> 3th:
>
> typedef struct person {
> char *name;
> char *surname;
> } person;
>
> 4th:
>
> typedef struct _PERSON {
> char *name;
> char *surnmae;
> } person;
>
> ?


I would have to say that they are /all/ "better", in that they all have
their own unique advantages that would elevate their importance under
certain circumstances.

Your first form
struct person {
char *name;
char *surname;
};
is basic; it works under all circumstances.
It has the advantage of being both the simplest form (thus making it's use
as foolproof as it /can/ be, for a structure), and obvious. It permits
expansion of the structure to include recursive pointers
(i.e. { struct person *nextperson; char *name; char *surname; } )
and does not confuse the programmer with multiple identical names in
different namespaces. Additionally, it can be used (in additional
statements) to seed a typedef, if required.

It has the disadvantage of being "wordier" than the other variations, and of
exposing the details of the structure, perhaps unnecessarily.


Your second form
typedef struct {
char *name;
char *surnname;
} person;
has the advantages of data hiding, simple namespace, and simplicity of use.
However, as an anonymous structure, access to its members will always be
through a typedef'ed declaration; you will not be able to declare /this/
structure in any other way (/similar, identically populated/ structures are
possible, but the compiler will not recognize them as identical to /this/
structure; anonymous structures are always "unique"). Additionally, this
form may not be modified to include a recursive pointer
(i.e. { person *nextperson; char *name; char *surname; } )


Your third form
typedef struct person {
char *name;
char *surname;
} person;
loses the disadvantage of being an anonymous structure; you can now /also/
define variables using the simple form of the structure
(i.e. struct person *newperson
You still /cannot/ use the typedef to define a recursive pointer
(i.e. { person *nextperson; char *name; char *surname; } )
but /can/ use the structure name instead
(i.e. { struct person *nextperson; char *name; char *surname; } )


Finally, your fourth form
typedef struct _PERSON {
char *name;
char *surnmae;
} person;
you've already been told why _PERSON isn't a good name. Otherwise, this is
no different from your third form. The only additional benefit might be
that the difference in names would assist the programmer in keeping the
usages straight.


In programming, I tend to either your first form, or your third form,
depending on the circumstances.

HTH
--
Lew Pitcher
"In Skills, We Trust"
 
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