> On Wed, Dec 04, 2019 at 11:49:20AM +0000, Andrew Gierth wrote: > > >>>>> "Dmitry" == Dmitry Dolgov <9erthali...@gmail.com> writes: > > Dmitry> Hi, > > Dmitry> Probably a simple question, but I don't see a simple answer so > Dmitry> far. In one extension I want to convert uint64 into a numeric > Dmitry> to put it eventually into a jsonb object. As far as I see in > Dmitry> numeric.c there are functions only for signed int64. Is there a > Dmitry> way to achive this with uint64 (without duplicating significant > Dmitry> part of numeric implementation in the extension)? > > Sure. Flip the top bit; convert the value as if signed; then subtract > -(2^63) from the result. (Easier to subtract -(2^63) than to add 2^63, > since the former can itself be represented in a signed int64 for easy > conversion to numeric.)
Indeed, looks like this does the trick, thank you!
