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The operand passed to_Alignof is never evaluated, despite not being an expression. For instance, if the operand is a VLA type, and the value of the VLA's size expression contains a side effect, that side effect is never evaluated.
The operand used in the controlling expression of a _genericGeneric selection expression is never evaluated.
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| Code Block | ||||
|---|---|---|---|---|
| ||||
#include <stdio.h>
void func(void) {
int val = 0;
/* ... */
size_t align = _Alignof(int[++val]);
printf("%z%zu, %d\n", align, val);
/* ... */
} |
...
| Code Block | ||||
|---|---|---|---|---|
| ||||
#include <stdio.h>
void func(void) {
int val = 0;
/* ... */
++val;
size_t align = _Alignof(int[val]);
printf("%z%zu, %d\n, align, val);
/* ... */
} |
...