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Q&A

Posts tagged language-lawyer

For questions dealing with one or more intimate restrictions (useful or esoteric) of a certain programming language.

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83%
+8 −0
Q&A Is partial allocation of an object Undefined Behavior?

Is it valid to partly allocate an object, as long as you only use the allocated part of it? #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; struct s { int i[100]; }; int main(void) {...

1 answer  ·  posted 12d ago by alx‭  ·  last activity 10d ago by Lundin‭

71%
+3 −0
Q&A Strict aliasing rules and function boundaries

Let's analyze this code, assuming an architecture where the alignment of int64_t is the same as that of double: void bar(double *f, int64_t *j) { *(int64_t *)f = *j; } void foo(void) ...

1 answer  ·  posted 13d ago by alx‭  ·  edited 13d ago by Lundin‭

77%
+5 −0
Q&A noreturn function with non-void return type

Is it legal ISO C to declare a function as noreturn with a non-void return type (but of course not actually returning)? As far as I can read from the standard, it seems legal. Example: noreturn ...

1 answer  ·  posted 12mo ago by alx‭  ·  edited 12mo ago by alx‭

80%
+6 −0
Q&A Are static pointers implicitly initialized to NULL?

Consider this code: #include &lt;stdio.h&gt; int main(void) { static void *ptr; if(ptr == NULL) puts("It's NULL!"); } I wonder if this is guaranteed to print "It's NULL!" I know ...

1 answer  ·  posted 12mo ago by klutt‭  ·  last activity 12mo ago by Lundin‭