Re: Alignment
On Feb 27, 4:15 am, "Chris M. Thomasson" <n...@spam.invalid> wrote:
<better_cs_...@yahoo.com> wrote in message
news:eab8ea3f-5616-4fd8-b2b0-16f86fe0b7a8@q1g2000vbn.googlegroups.com...
Please consider the two definitions below:
Foo foo;
unsigned char foo[sizeof(Foo)];
Are these guaranteed to have the same alignment, or will the
second definition have an alignment that is only modulo 1?
You can attempt to calculate alignment of `Foo' objects like this:
Which isn't what he needs, but...
___________________________________________________________________
#include <cstddef>
#include <cstdio>
struct Foo {
char a;
int b;
double c;
Foo(int b) {
// [...];
}
};
template<typename T>
size_t get_type_alignment() {
struct aligner {
char m_pad;
T m_obj;
};
return offsetof(aligner, m_obj);
This is undefined behavior if T isn't a POD (and Foo isn't). It
won't compile with at least one compiler I use.
}
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