Hello,
I am proposing to create two new keywords for C, 'notnull' and
'nullable'.
Their meaning is a sort of 'design by contract', ensuring some rules
are
verified at compile-time. It should not require additional runtime-
checks
to be implemented.
I have posted my description of how it should work at this URL: http://sarnold.free.fr/wordpress/?p=71
Please read it and tell me what you think of it.
Regards,
Stéphane A. 20  2434  sa*****@free.fr wrote:
>
Hello,
I am proposing to create two new keywords for C, 'notnull' and
'nullable'.
Their meaning is a sort of 'design by contract', ensuring some rules
are
verified at compile-time. It should not require additional runtime-
checks
to be implemented.
I have posted my description of how it should work at this URL:
http://sarnold.free.fr/wordpress/?p=71
Please read it and tell me what you think of it.
I don't need it.
I don't want it.
I don't like it.
I'm surprised it isn't already in C99.
--
pete sa*****@free.fr writes:
Hello,
I am proposing to create two new keywords for C, 'notnull' and
'nullable'.
Their meaning is a sort of 'design by contract', ensuring some rules
are
verified at compile-time. It should not require additional runtime-
checks
to be implemented.
I have posted my description of how it should work at this URL:
http://sarnold.free.fr/wordpress/?p=71
Please read it and tell me what you think of it.
Regards,
Stéphane A.
Simplify it. There is no need for "nullable" since it's already there.
In addition I think it's a silly idea. Just wrap malloc to do what you want to
do rather than have the assignment to a notnull variable. Much more
efficient. Otherwise every time you assign to a notnull the system will
be performing these checks. sa*****@free.fr wrote:
Hello,
I am proposing to create two new keywords for C, 'notnull' and
'nullable'.
Their meaning is a sort of 'design by contract', ensuring some rules
are
verified at compile-time. It should not require additional runtime-
checks
to be implemented.
I have posted my description of how it should work at this URL:
http://sarnold.free.fr/wordpress/?p=71
Please read it and tell me what you think of it.
Regards,
Stéphane A.
You can assert a parameter not being null in standard C by
int function(int MyTable[static 1]);
This means that the parameter MyTable has at least one
element, i.e. it can't be NULL.
True, it is NOT a GREAT syntax but it is standard.
jacob sa*****@free.fr wrote:
I am proposing to create two new keywords for C, [ ... ]
Since you are apparently proposing changes to the language the correct
group for that would be <news:comp.std. c>
santosh <sa*********@gm ail.comwrites: sa*****@free.fr wrote:
>I am proposing to create two new keywords for C, [ ... ]
Since you are apparently proposing changes to the language the correct
group for that would be <news:comp.std. c>
He is asking for C programmer's opinions. So here is perfectly valid.
On Sun, 04 Nov 2007 18:53:49 +0100, jacob navia wrote:
sa*****@free.fr wrote:
>Hello,
I am proposing to create two new keywords for C, 'notnull' and
'nullable'.
Their meaning is a sort of 'design by contract', ensuring some rules
are
verified at compile-time. It should not require additional runtime-
checks
to be implemented.
I have posted my description of how it should work at this URL:
http://sarnold.free.fr/wordpress/?p=71 Please read it and tell me what
you think of it.
Regards,
Stéphane A.
You can assert a parameter not being null in standard C by
int function(int MyTable[static 1]);
Almost, but not quite.
This means that the parameter MyTable has at least one element, i.e. it
can't be NULL.
It means you can't call function with the result of malloc(1), while
occasionally (okay, rarely) that's actually useful.
Harald van Dijk wrote:
On Sun, 04 Nov 2007 18:53:49 +0100, jacob navia wrote:
>sa*****@free.fr wrote:
>>Hello,
I am proposing to create two new keywords for C, 'notnull' and
'nullable'.
Their meaning is a sort of 'design by contract', ensuring some rules
are
verified at compile-time. It should not require additional runtime-
checks
to be implemented.
I have posted my description of how it should work at this URL:
http://sarnold.free.fr/wordpress/?p=71 Please read it and tell me what
you think of it.
Regards,
Stéphane A.
You can assert a parameter not being null in standard C by
int function(int MyTable[static 1]);
Almost, but not quite.
>This means that the parameter MyTable has at least one element, i.e. it
can't be NULL.
It means you can't call function with the result of malloc(1), while
occasionally (okay, rarely) that's actually useful.
Can you explain what you say?
I didn't understand what you are saying. sa*****@free.fr wrote:
Hello,
I am proposing to create two new keywords for C, 'notnull' and
'nullable'.
Their meaning is a sort of 'design by contract', ensuring some rules
are
verified at compile-time. It should not require additional runtime-
checks
to be implemented.
I have posted my description of how it should work at this URL:
http://sarnold.free.fr/wordpress/?p=71
Please read it and tell me what you think of it.
Your proposal should describe why the proposed feature
would be useful, why it would make life better for programmers
and/or improve the quality of programs. If the information
is already there, it is presented too subtly for me to grasp.
By the way, the example with free() is not well-chosen.
The behavior of free() with a NULL argument is well-defined;
there is no need to assert that the argument cannot be NULL,
because it can be. Perhaps an example with fclose() or
strlen() would raise fewer eyebrows.
--
Eric Sosman es*****@ieee-dot-org.invalid This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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