BloombergLP::bsls::AlignmentUtil::calculateAlignmentFromSize

Return the natural alignment for a memory block of the specified size ‐‐ i.e., the largest power of 2 that evenly divides size, up to a maximum of BSLS_MAX_ALIGNMENT. It is guaranteed that this alignment will be sufficient for any object having a footprint of size bytes on the current platform. The behavior is undefined unless 1 <= size and size <= INT_MAX. Note that, depending on the machine architecture and compiler setting, the returned alignment value may be more restrictive than required for a particular object for two reasons: 1. The object may be composed entirely of elements, such as char, that have minimal alignment restrictions, and 2. The architecture and our compiler settings may result in unexpectedly lenient alignment requirements. Also note that aligning on a more restrictive boundary may improve performance.