printing template arguments

http://www.talkaboutprogramming.com/group/comp.lang.c++.moderated/messages/160260.html

[snip]
Is there any way to get information about the
template arguments during instantiation?
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無理なんじゃないの・・・と思ったら
http://www.talkaboutprogramming.com/group/comp.lang.c++.moderated/messages/160343.html

[snip]
You could instantiate boost::mpl::print from within your template
(see http://www.boost.org/boost/mpl/print.hpp).
 It's been tuned to
generate warnings that will show you what T is on many compilers.
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出来るのかー！！何？warningとして型を表示するってこと？なんか苦肉の策っぽくないか，それって？後で実験してみるか．