void HTML_Template_Sigma::setCacheRoot (
Sets the directory to cache "prepared" templates in, the directory should be writable for PHP.
The "prepared" template contains an internal representation of template structure: essentially a serialized array of $_blocks, $_blockVariables, $_children and $_functions, may also contain $_triggers. This allows to bypass expensive calls to HTML_Template_Sigma::_buildBlockVariables() and especially HTML_Template_Sigma::_buildBlocks() when reading the "prepared" template instead of the "source" one.
The files in this cache do not have any TTL and are regenerated when the source templates change.
throws no exceptions thrown
This function can not be called statically.