On 2011-05-04, harrismh777 <harrismh...@charter.net> wrote:
> Hans Georg Schaathun wrote:
>> In C it is pass by value, as the pointer is explicit and do whatever
>> you want with the pointer value.
>
> You clearly are not a C programmer.
>
> Most of my C data abstractions use dual circular linked lists of
> pointers to structures of pointers. *All* of that is only ever passed
> (at least in my programming) as references. My code almost never
> passes data by value.
>
> We do not consider passing a pointer as *by value* because its an
> address; by definition, that is pass-by-reference.
No, it isn't. It's pass by value. The fact that you are passing a
value that is a pointer to another value is not relevent.
Pass by reference means that if I call
foo(x)
And foo looks like this:
foo(param)
param = 4
Then 'x' in the caller's namespace ends up set to 4.
> We are not passing the *value* of the data, we are passing the memory
> location (the reference) to the data.
You're pass a value. That value is a pointer to some other value.
> Pass by *value* on the other hand actually places the *value* of the
> data item on the call stack as a parameter.
C is pass by value.
if I call foo(x)
And this is foo:
void foo (float param)
{
param = 1.23
}
The value of x in the caller's namespace is not changed. If C used
pass by reference, x would change.
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