right, or just loop through the existing types and check whether 8*sizeof() is large enough.
i didn't find anything in base either. the reason why o thought it should perhaps be added is because it requires knowledge of hat sizes are supported. andrew On Monday, 30 December 2013 12:24:20 UTC-3, John Myles White wrote: > > I’m still a little confused, but it sounds like Elliot’s suggestion was > right: iceil(log2(x)) will tell you how much bits are needed to represent > the value, so you’d need some function that wraps that calculation and then > finds the closest power of 2 to the output to determine the right storage > type. > > I’m pretty sure that function doesn’t exist in Base. > > — John > > On Dec 30, 2013, at 6:35 AM, andrew cooke <[email protected] <javascript:>> > wrote: > > > > > julia> smallest_uint(5) > > Uint8 > > > > so this isn't typeof() (which you might have been describing). > > > > i have code that needs to generate a table of values (bit fields, but > Vector{Bit} isn't so useful), but the number of the bits can vary. > > > > andrew > > > > On Monday, 30 December 2013 00:00:11 UTC-3, John Myles White wrote: > > I’m a little unsure what you mean. Are you asking for a function that > given a 32bit value returns that it’s of type Uint32? I would guess (but > maybe am way offbase) that you’ll be storing 30bit unsigned integers inside > of Uint32’s, right? > > > > — John > > > > On Dec 29, 2013, at 7:45 PM, andrew cooke <[email protected]> wrote: > > > > > question says it all really. if i need to deal with 30bit unsigned > integers, is there anything that returns Uint32? > > > > > > [obviously i can just tabulate what there is if missing, but i > wondered if it would also be good for the std lib.] > > > > > > thanks, andrew > > > >
