Re: Class instance alignment

[tsbockman via Digitalmars-d-learn]

On Tuesday, 23 February 2021 at 03:53:00 UTC, tsbockman wrote:
size_t alignedSize(size_t typeSize, size_t typeAlignment) pure 
@safe nothrow @nogc {
    version(assert) {
        import core.bitop : bsr;
        assert(typeAlignment == (size_t(1) << 
bsr(typeAlignment)));
    }
    size_t ret = typeSize & ~(typeAlignment - 1);
    ret += (ret < typeSize)? typeAlignment : 0;
    return ret;
}

Better:

size_t alignedSize(size_t typeSize, size_t typeAlignment) pure 
@safe nothrow @nogc {
    version(assert) {
        import core.bitop : bsr;
        assert(typeAlignment == (size_t(1) << 
bsr(typeAlignment)));
    }
    const alignMask = typeAlignment - 1;
    return (typeSize + alignMask) & ~alignMask;
}