What is the recommended way to align memory in C++11

Question

I am working on a single producer single consumer ring buffer implementation.I have two requirements:

1. Align a single heap allocated instance of a ring buffer to

Answer 1

I don't know if it is the best way to align memory allocated with a new operator, but it is certainly very simple !

This is the way it is done in thread sanitizer pass in GCC 6.1.0

#define ALIGNED(x) __attribute__((aligned(x)))

static char myarray[sizeof(myClass)] ALIGNED(64) ;
var = new(myarray) myClass;

Well, in sanitizer_common/sanitizer_internal_defs.h, it is also written

// Please only use the ALIGNED macro before the type.
// Using ALIGNED after the variable declaration is not portable!        

So I do not know why the ALIGNED here is used after the variable declaration. But it is an other story.