26 Oct
2010
26 Oct
'10
11:18 p.m.
Is it guaranteed (I mean by the C standard) that the alignment of a struct (which affects only the possible start address) also has effect on the sizeof() for that struct, in the sense that sizeof() is guaranteed to be a multiple of that alignment requirement?
Yes. Because if you make an array, all of them must be aligned, and the size of an array is a multiple of sizeof(array_item). While alignment is not in the standard, the sizeof/array relationship is.
It's in C99 draft (http://busybox.net/~landley/c99-draft.html)
6.5.3.4 The sizeof operator
#6
EXAMPLE 2 Another use of the sizeof operator is to compute the number of elements in an array: sizeof array / sizeof array[0]
/alessandro