On Mon, Nov 16, 2015 at 01:20:11PM -0500, Richard Heck wrote: > On 11/15/2015 05:27 PM, Scott Kostyshak wrote: > > > >The following is not a critique (so please push because of Richard's > >positive feedback), but if you have time I am curious about the following: > > > >strwidth_cache_(1 << 19) > > > >How did you decide on 19? And why the trick of 1 << 19 instead of just the > >following? > > > >strwidth_cache_(19) > > > >I'm guessing this is a C++ trick I should know. > > 1 << 19 is a 1 with 19 zeros after it, in binary notation, so is equivalent > to 2^19 = 512K but much faster to calculate. This trick is used extensively > in debug.h.
Thanks for this explanation, Richard. Now I understand. I'm still curious how 512K was chosen. Scott
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