Re: technology discussion → does the world need a "new" C ?

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Sujet : Re: technology discussion → does the world need a "new" C ?
De : tr.17687 (at) *nospam* z991.linuxsc.com (Tim Rentsch)
Groupes : comp.lang.c
Date : 15. Aug 2024, 09:43:38
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <86a5hep45h.fsf@linuxsc.com>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
User-Agent : Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux)
Bart <bc@freeuk.com> writes:

[on comparing array arguments in C with call-by-reference]

[...] the differences [between C rules and true call-by-reference]
can be summarised here;  [...]
>
                                 Call     Array access in callee
>
    C call-by-value              F(A)     A[i]
>
    true call-by-reference       H(A)     A[i]
>
What the user has to write is what's important, and here it is clear
that they write the same thing [in the two cases shown].


The comparison above is misleading because it is incomplete.
Let's compare the two modes more fully:


                        C call-by-value         call-by-reference
                        ===============         =================
  at call:

    (array argument)    F(A)                    H(A)

    (pointer argument)  F(p)                    (disallowed)

    (null argument)     F(0)                    (disallowed)


  inside function:

    (access)            A[i]                    A[i]

    (update)            A[i] = ...              A[i] = ...

    sizeof A            (pointer size)          (array size)

    A++                 (changes A variable)    (disallowed)

    A = (new value)     (changes A variable)    (disallowed)


The more complete comparion illustrate why C semantics should not
be thought of as call-by-reference.

Date Sujet#  Auteur
4 Jul 24 * technology discussion → does the world need a "new" C ?309aotto1968
5 Jul 24 +* Re: technology discussion → does the world need a "new" C ?306Lawrence D'Oliveiro
5 Jul 24 i`* Re: technology discussion → does the world need a "new" C ?305BGB
5 Jul 24 i +* Re: technology discussion → does the world need a "new" C ?2Lawrence D'Oliveiro
5 Jul 24 i i`- Re: technology discussion → does the world need a "new" C ?1yeti
5 Jul 24 i +* Re: technology discussion → does the world need a "new" C ?275Keith Thompson
5 Jul 24 i i+- Re: technology discussion → does the world need a "new" C ?1Lawrence D'Oliveiro
5 Jul 24 i i+* Re: technology discussion → does the world need a "new" C ?272BGB
5 Jul 24 i ii+* Re: technology discussion → does the world need a "new" C ?18Ben Bacarisse
5 Jul 24 i iii`* Re: technology discussion → does the world need a "new" C ?17BGB
5 Jul 24 i iii +* Re: technology discussion → does the world need a "new" C ?14Ben Bacarisse
6 Jul 24 i iii i+* Re: technology discussion → does the world need a "new" C ?9BGB
6 Jul 24 i iii ii+* Re: technology discussion → does the world need a "new" C ?2David Brown
6 Jul 24 i iii iii`- Re: technology discussion → does the world need a "new" C ?1BGB
6 Jul 24 i iii ii`* Re: technology discussion → does the world need a "new" C ?6Ben Bacarisse
7 Jul 24 i iii ii +* Re: technology discussion → does the world need a "new" C ?2Keith Thompson
7 Jul 24 i iii ii i`- Re: technology discussion → does the world need a "new" C ?1Tim Rentsch
7 Jul 24 i iii ii `* Re: technology discussion → does the world need a "new" C ?3BGB
7 Jul 24 i iii ii  `* Re: technology discussion → does the world need a "new" C ?2bart
7 Jul 24 i iii ii   `- Re: technology discussion → does the world need a "new" C ?1BGB
6 Jul 24 i iii i`* Re: technology discussion → does the world need a "new" C ?4Malcolm McLean
6 Jul 24 i iii i `* Re: technology discussion → does the world need a "new" C ?3BGB
6 Jul 24 i iii i  `* Re: technology discussion → does the world need a "new" C ?2bart
6 Jul 24 i iii i   `- Re: technology discussion → does the world need a "new" C ?1BGB
6 Jul 24 i iii `* Re: technology discussion → does the world need a "new" C ?2Janis Papanagnou
6 Jul 24 i iii  `- Re: technology discussion → does the world need a "new" C ?1BGB
5 Jul 24 i ii`* Re: technology discussion → does the world need a "new" C ?253Keith Thompson
6 Jul 24 i ii `* Re: technology discussion → does the world need a "new" C ?252Lawrence D'Oliveiro
6 Jul 24 i ii  +* Re: technology discussion → does the world need a "new" C ?236BGB
6 Jul 24 i ii  i+- Re: technology discussion → does the world need a "new" C ?1BGB
6 Jul 24 i ii  i+* Re: technology discussion → does the world need a "new" C ?6James Kuyper
6 Jul 24 i ii  ii`* Re: technology discussion → does the world need a "new" C ?5BGB
9 Jul 24 i ii  ii `* Re: technology discussion → does the world need a "new" C ?4David Brown
9 Jul 24 i ii  ii  `* Re: technology discussion → does the world need a "new" C ?3Michael S
9 Jul 24 i ii  ii   +- Re: technology discussion → does the world need a "new" C ?1David Brown
9 Jul 24 i ii  ii   `- Re: technology discussion → does the world need a "new" C ?1BGB
6 Jul 24 i ii  i`* Re: technology discussion → does the world need a "new" C ?228Keith Thompson
7 Jul 24 i ii  i +* Re: technology discussion → does the world need a "new" C ?223BGB
7 Jul 24 i ii  i i`* Re: technology discussion → does the world need a "new" C ?222James Kuyper
7 Jul 24 i ii  i i `* Re: technology discussion → does the world need a "new" C ?221BGB
8 Jul 24 i ii  i i  `* Re: technology discussion → does the world need a "new" C ?220James Kuyper
8 Jul 24 i ii  i i   `* Re: technology discussion → does the world need a "new" C ?219Kaz Kylheku
8 Jul 24 i ii  i i    +- Re: technology discussion → does the world need a "new" C ?1BGB
8 Jul 24 i ii  i i    +- Re: technology discussion → does the world need a "new" C ?1Ben Bacarisse
8 Jul 24 i ii  i i    +* Re: technology discussion → does the world need a "new" C ?215James Kuyper
8 Jul 24 i ii  i i    i`* Re: technology discussion → does the world need a "new" C ?214BGB
9 Jul 24 i ii  i i    i `* Re: technology discussion → does the world need a "new" C ?213David Brown
9 Jul 24 i ii  i i    i  +* Re: technology discussion → does the world need a "new" C ?205bart
9 Jul 24 i ii  i i    i  i+* Re: technology discussion → does the world need a "new" C ?202Ben Bacarisse
9 Jul 24 i ii  i i    i  ii`* Re: technology discussion → does the world need a "new" C ?201bart
9 Jul 24 i ii  i i    i  ii +* Re: technology discussion → does the world need a "new" C ?192Ben Bacarisse
9 Jul 24 i ii  i i    i  ii i+* Re: technology discussion → does the world need a "new" C ?3BGB
10 Jul 24 i ii  i i    i  ii ii`* Re: technology discussion → does the world need a "new" C ?2Ben Bacarisse
10 Jul 24 i ii  i i    i  ii ii `- Re: technology discussion → does the world need a "new" C ?1BGB
9 Jul 24 i ii  i i    i  ii i`* Re: technology discussion → does the world need a "new" C ?188bart
9 Jul 24 i ii  i i    i  ii i +- Re: technology discussion → does the world need a "new" C ?1Tim Rentsch
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10 Jul 24 i ii  i i    i  ii i   `* Re: technology discussion → does the world need a "new" C ?184Ben Bacarisse
10 Jul 24 i ii  i i    i  ii i    +- Re: technology discussion → does the world need a "new" C ?1Thiago Adams
10 Jul 24 i ii  i i    i  ii i    +* Re: technology discussion → does the world need a "new" C ?175bart
10 Jul 24 i ii  i i    i  ii i    i+- Re: technology discussion → does the world need a "new" C ?1Janis Papanagnou
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10 Jul 24 i ii  i i    i  ii i    ii+* Re: technology discussion → does the world need a "new" C ?14Michael S
10 Jul 24 i ii  i i    i  ii i    iii+* Re: technology discussion → does the world need a "new" C ?8David Brown
11 Jul 24 i ii  i i    i  ii i    iiii`* Re: technology discussion → does the world need a "new" C ?7Michael S
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11 Jul 24 i ii  i i    i  ii i    iiii   +- Re: technology discussion → does the world need a "new" C ?1David Brown
11 Jul 24 i ii  i i    i  ii i    iiii   `- Re: technology discussion → does the world need a "new" C ?1Ben Bacarisse
10 Jul 24 i ii  i i    i  ii i    iii+- Re: technology discussion → does the world need a "new" C ?1Kaz Kylheku
11 Jul 24 i ii  i i    i  ii i    iii`* Re: technology discussion → does the world need a "new" C ?4Tim Rentsch
11 Jul 24 i ii  i i    i  ii i    iii `* Re: technology discussion → does the world need a "new" C ?3BGB
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11 Jul 24 i ii  i i    i  ii i    iii   `- Re: technology discussion → does the world need a "new" C ?1BGB
10 Jul 24 i ii  i i    i  ii i    ii`* Re: technology discussion → does the world need a "new" C ?39bart
10 Jul 24 i ii  i i    i  ii i    ii +* Re: technology discussion → does the world need a "new" C ?37Michael S
10 Jul 24 i ii  i i    i  ii i    ii i+* Re: technology discussion → does the world need a "new" C ?34bart
11 Jul 24 i ii  i i    i  ii i    ii ii+- Re: technology discussion → does the world need a "new" C ?1Michael S
11 Jul 24 i ii  i i    i  ii i    ii ii`* Re: technology discussion → does the world need a "new" C ?32Tim Rentsch
11 Jul 24 i ii  i i    i  ii i    ii ii `* Re: technology discussion → does the world need a "new" C ?31bart
11 Jul 24 i ii  i i    i  ii i    ii ii  +* Re: technology discussion → does the world need a "new" C ?2Tim Rentsch
11 Jul 24 i ii  i i    i  ii i    ii ii  i`- Re: technology discussion → does the world need a "new" C ?1bart
11 Jul 24 i ii  i i    i  ii i    ii ii  `* Re: technology discussion → does the world need a "new" C ?28Keith Thompson
11 Jul 24 i ii  i i    i  ii i    ii ii   `* Re: technology discussion → does the world need a "new" C ?27bart
11 Jul 24 i ii  i i    i  ii i    ii ii    +* Re: technology discussion → does the world need a "new" C ?25Keith Thompson
11 Jul 24 i ii  i i    i  ii i    ii ii    i+* Re: technology discussion → does the world need a "new" C ?15bart
12 Jul 24 i ii  i i    i  ii i    ii ii    ii`* Re: technology discussion → does the world need a "new" C ?14David Brown
12 Jul 24 i ii  i i    i  ii i    ii ii    ii +* Re: technology discussion → does the world need a "new" C ?12bart
12 Jul 24 i ii  i i    i  ii i    ii ii    ii i+- Re: technology discussion → does the world need a "new" C ?1Janis Papanagnou
12 Jul 24 i ii  i i    i  ii i    ii ii    ii i+* Re: technology discussion → does the world need a "new" C ?7David Brown
12 Jul 24 i ii  i i    i  ii i    ii ii    ii ii`* Re: technology discussion → does the world need a "new" C ?6bart
12 Jul 24 i ii  i i    i  ii i    ii ii    ii ii +* Re: technology discussion → does the world need a "new" C ?2bart
13 Jul 24 i ii  i i    i  ii i    ii ii    ii ii i`- Re: technology discussion → does the world need a "new" C ?1David Brown
13 Jul 24 i ii  i i    i  ii i    ii ii    ii ii `* Re: technology discussion → does the world need a "new" C ?3David Brown
17 Jul 24 i ii  i i    i  ii i    ii ii    ii ii  `* Re: technology discussion → does the world need a "new" C ?2Bart
17 Jul 24 i ii  i i    i  ii i    ii ii    ii ii   `- Re: technology discussion → does the world need a "new" C ?1David Brown
12 Jul 24 i ii  i i    i  ii i    ii ii    ii i`* Re: technology discussion → does the world need a "new" C ?3Keith Thompson
12 Jul 24 i ii  i i    i  ii i    ii ii    ii i `* Re: technology discussion → does the world need a "new" C ?2James Kuyper
12 Jul 24 i ii  i i    i  ii i    ii ii    ii `- Re: technology discussion → does the world need a "new" C ?1BGB
11 Jul 24 i ii  i i    i  ii i    ii ii    i`* Re: technology discussion → does the world need a "new" C ?9bart
12 Jul 24 i ii  i i    i  ii i    ii ii    `- Re: technology discussion → does the world need a "new" C ?1Thiago Adams
10 Jul 24 i ii  i i    i  ii i    ii i+- Re: technology discussion → does the world need a "new" C ?1Keith Thompson
10 Jul 24 i ii  i i    i  ii i    ii i`- Re: technology discussion → does the world need a "new" C ?1James Kuyper
11 Jul 24 i ii  i i    i  ii i    ii `- Re: technology discussion → does the world need a "new" C ?1Tim Rentsch
10 Jul 24 i ii  i i    i  ii i    i+* Re: technology discussion → does the world need a "new" C ?2James Kuyper
11 Jul 24 i ii  i i    i  ii i    i`* Re: technology discussion → does the world need a "new" C ?117Ben Bacarisse
10 Jul 24 i ii  i i    i  ii i    `* Re: technology discussion → does the world need a "new" C ?7Janis Papanagnou
9 Jul 24 i ii  i i    i  ii `* Re: technology discussion → does the world need a "new" C ?8Kaz Kylheku
9 Jul 24 i ii  i i    i  i+- Re: technology discussion → does the world need a "new" C ?1David Brown
9 Jul 24 i ii  i i    i  i`- Re: technology discussion → does the world need a "new" C ?1Keith Thompson
9 Jul 24 i ii  i i    i  +- Re: technology discussion → does the world need a "new" C ?1Michael S
9 Jul 24 i ii  i i    i  `* Re: technology discussion → does the world need a "new" C ?6BGB
9 Jul 24 i ii  i i    `- Re: technology discussion → does the world need a "new" C ?1Tim Rentsch
10 Jul 24 i ii  i `* Re: technology discussion → does the world need a "new" C ?4Lawrence D'Oliveiro
6 Jul 24 i ii  +* Re: technology discussion → does the world need a "new" C ?9James Kuyper
6 Jul 24 i ii  `* Re: technology discussion → does the world need a "new" C ?6Keith Thompson
6 Jul 24 i i`- Re: technology discussion → does the world need a "new" C ?1Lawrence D'Oliveiro
5 Jul 24 i +* Re: technology discussion → does the world need a "new" C ?26bart
5 Jul 24 i `- Re: technology discussion → does the world need a "new" C ?1lexi hale
7 Jul 24 `* Re: technology discussion → does the world need a "new" C ?2Bonita Montero

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