http://lists.boost.org/MailArchives/boost/msg70844.php
(boost.devel 2004/09/11~)
OOPSLA2004WSでのproposalらしいけど
These basic concepts should return a boolean results instead of aborting compilation immediately, thus any metaprogramming tool could use the result of the check.
ヽ(`Д´)ノ うおー！paperダウソできねー！どうやってるのかすげー気になるー！
＃ワ━━ヽ(・∀・)ノ━━イpaperダウソできたー！
＃って，なんで単なる趣味でpaperなんか読んでるんだ俺は━━━━━(ゞ゜Д゜)ゞ━━━━━！！
