Hi, I am using VRT muparser expressions for bitwise operations when creating masks and wanted to understand why I can't get the *bitwise & *operator working? My current solution is to use fmod which is fine (and I think equivalent) but using "&" would be convenient and a bit easier to read...
To illustrate, the following file works: https://gist.github.com/h-a-graham/6db16e70e064ae8173f1052537c59761#file-fmask-fmodmask-vrt the expression used here is:"(fmod(Fmask, 16) >= 8) || (fmod(Fmask, 8) >= 4) ? 0 : 1" ``` gdal convert "/vsicurl/ https://gist.githubusercontent.com/h-a-graham/6db16e70e064ae8173f1052537c59761/raw/c48b15852bcc7c5252cae4b906c14b9a3205a33d/fmask-fmodmask.vrt"; "test.tif" ``` However, the following file fails: https://gist.github.com/h-a-graham/6db16e70e064ae8173f1052537c59761#file-fmask-bitmask-vrt the expression parsed as: "((Fmask & 8) > 0 || (Fmask & 4) > 0) ? 0 : 1" in the XML but provided as (to my xml parser): "((Fmask & 8) > 0 || (Fmask & 4) > 0) ? 0 : 1" ``` gdal convert "/vsicurl/ https://gist.githubusercontent.com/h-a-graham/6db16e70e064ae8173f1052537c59761/raw/c48b15852bcc7c5252cae4b906c14b9a3205a33d/fmask-bitmask.vrt"; "test.tif" 0...10...20..ERROR 1: Unexpected token "& 8) > 0 || (Fmask & 4) > 0) ? 0 : 1 " found at position 8. ``` So, is using "&" possible, or should I just stick with fmod and not worry about it? Any help would be much appreciated. Hugh
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