Consider the following generic type, which ensures to be large enough by
allocating enough padding A and the to-be-aligned type T:
type Alignment interface {
Align16 | Align64
}
type Align16 = [16]byte
type Align64 = [64]byte
type Aligned[T any, A Alignment] struct {
pad A
val T
}
func (p *Aligned[T, A]) Value() *T {
size := unsafe.Sizeof(*new(A))
align := size - uintptr(unsafe.Pointer(&p.pad[0]))&(size-1)
return (*T)(unsafe.Pointer(&p.pad[align]))
}
Under the assumption that T has no heap pointers, is this safe? Or asked in
another way, under which circumstances would this break?
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