ó ’›V]c@s~dZddlmZeƒZeƒZeeed„Zed„Zed„Z d„Z de fd„ƒYZ d „Z d S( s³ - the popular ``_memoize_default`` works like a typical memoize and returns the default otherwise. - ``CachedMetaClass`` uses ``_memoize_default`` to do the same with classes. iÿÿÿÿ(tdebugcs‡‡‡fd†}|S(sO This is a typical memoization decorator, BUT there is one difference: To prevent recursion it sets defaults. Preventing recursion is in this case the much bigger use than speed. I don't think, that there is a big speed difference, but there are many cases where recursion could happen (think about a = b; b = a). cs‡‡‡‡fd†}|S(NcsЈr|j}n"ˆr(|dj}n |jj}y|ˆ}Wntk rci|ˆ<}nX||t|jƒƒf}||kr“||Sˆtk r¬ˆ||s  %