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From: BGB <cr88192@gmail.com>
Newsgroups: comp.lang.c
Subject: =?UTF-8?Q?Re=3A_technology_discussion_=E2=86=92_does_the_world_need?=
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Date: Tue, 9 Jul 2024 19:08:06 -0500
Organization: A noiseless patient Spider
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On 7/9/2024 6:15 PM, Ben Bacarisse wrote:
> BGB <cr88192@gmail.com> writes:
> 
>> On 7/9/2024 12:22 PM, Ben Bacarisse wrote:
>>> bart <bc@freeuk.com> writes:
>>>
>>>> On 09/07/2024 16:58, Ben Bacarisse wrote:
>>>>> bart <bc@freeuk.com> writes:
>>>>>
>>>>>> Arrays are passed by reference:
>>>>>>
>>>>>>      void F(int a[20]) {}
>>>>>>
>>>>>>      int main(void) {
>>>>>>        int x[20];
>>>>>>        F(x);
>>>>>>      }
>>>>> This is the sort of thing that bad tutors say to students so that they
>>>>> never learn C properly.  All parameter passing in C is by value.  All of
>>>>> it.  You just have to know (a) what the syntax means and (b) what values
>>>>> get passed.
>>>>
>>>> The end result is that a parameter declared with value-array syntax is
>>>> passed using a reference rather than by value.
>>>>
>>>> And it does so because the language says, not because the ABI requires
>>>> it. A 2-byte array is also passed by reference.
>>> An address value is passed by value.  C has only one parameter passing
>>> mechanism.  You can spin it as much as you like, but C's parameter
>>> passing is simple to understand, provided learner tune out voices like
>>> yours.
>>
>> Though, in ABI specs, this would usually still be termed as "pass by
>> reference"
> 
> I am not saying that Bart is alone in getting this wrong.  Any document
> that that says that C have any parameter passing mechanism other than
> pass by value is wrong.  But then I doubt any ABI spec says that since
> an ABI is, almost by definition, not about the C language.
> 

True enough.

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