C Language Operators _Alignof
Example
C11
Queries the alignment requirement for the specified type. The alignment requirement is a positive integral power of 2 representing the number of bytes between which two objects of the type may be allocated. In C, the alignment requirement is measured in size_t.
The type name may not be an incomplete type nor a function type. If an array is used as the type, the type of the array element is used.
This operator is often accessed through the convenience macro alignof from <stdalign.h>.
int main(void)
{
printf("Alignment of char = %zu\n", alignof(char));
printf("Alignment of max_align_t = %zu\n", alignof(max_align_t));
printf("alignof(float[10]) = %zu\n", alignof(float[10]));
printf("alignof(struct{char c; int n;}) = %zu\n",
alignof(struct {char c; int n;}));
}
Possible Output:
Alignment of char = 1
Alignment of max_align_t = 16
alignof(float[10]) = 4
alignof(struct{char c; int n;}) = 4
