re PR libstdc++/48114 ([C++0x] binomial_distribution incorrect for p > .5 and geometr...

re PR libstdc++/48114 ([C++0x] binomial_distribution incorrect for p > .5 and geometric_distribution wrongly implements the TR1 definition)

2011-03-14  Andrey Zholos  <aaz@althenia.net>

	PR libstdc++/48114
	* include/bits/random.h (geometric_distribution): Correct formula
	in comment, per C++0x.
	(geometric_distribution<>::param_type::param_type(double)): Fix check.
	(geometric_distribution<>::param_type::_M_initialize):
	Store log(1 - p).
	* include/bits/random.tcc (geometric_distribution<>::operator()):
	Fix computation.
	(binomial_distribution<>::operator()): Likewise.

From-SVN: r170946