On Tue, 11 Oct 2011, Carsten Haitzler (The Rasterman) wrote:
> On Tue, 11 Oct 2011 08:14:47 +0200 (CEST) Vincent Torri <vto...@univ-evry.fr> > said: > >> >> >> On Mon, 10 Oct 2011, Enlightenment SVN wrote: >> >>> Log: >>> use lround() for map coord rounding to avoid silly things like >>> 15.999999999999999998 rounding down to 15... whihc leads to >>> sometimes... odd off-by-1 expected results. >> >> lround is C99 compliant and does not exist on Windows. >> >> why not using the macro >> >> #define round(x) (x<0?ceil((x)-0.5):floor((x)+0.5)) > > because 1. i dont have a manual page for what is NOT supported in windows's > dev > envs (that's why we have you!). in google : "msdn the_function" Also, did you read the man page of lround ? See http://linux.die.net/man/3/lround did you read the line "Compile with -std=c99" ? Is that flag passed to the compiler ? Note that i added an m4 macro that checks if a flags is supported by the compiler 2. floor and ceil return doubles, not > integers. lround returns a long int (long). so (long)ceil(15.999999999999999) does not return 16 ? > why not do it that way? less efficient than a single lround call. and > technically incorrect. i'm literally trying to solve minuscule rounding issues > here and returning a rounded double could still return an inaccurate (by a > very > tiny margin) double that will still get rounded the wrong way. :( need a call > that rounds and returns an integer type (int, long, etc.) not a double or > float. The, at least, check the availability in configure.ac then #ifndef HAVE_LROUND # define lround **** #endif Vincent ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
