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re PR libstdc++/56202 (SIGFPE (division by zero) in std::binomial_distribution) 

2013-02-04  Manuel López-Ibáñez  <manu@gcc.gnu.org>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/56202
	* include/bits/random.tcc (binomial_distribution<>::
	_M_waiting(_UniformRandomNumberGenerator&, _IntType)): Avoid
	division by zero.

Co-Authored-By: Paolo Carlini <paolo.carlini@oracle.com>

From-SVN: r195722
This commit is contained in:
Manuel López-Ibáñez 2013-02-04 17:10:59 +00:00 committed by Paolo Carlini
parent 152689dc44
commit 85018f40ae
2 changed files with 14 additions and 0 deletions
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8
libstdc++-v3/ChangeLog
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@ -1,3 +1,11 @@
2013-02-04 Manuel López-Ibáñez <manu@gcc.gnu.org>
Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/56202
* include/bits/random.tcc (binomial_distribution<>::
_M_waiting(_UniformRandomNumberGenerator&, _IntType)): Avoid
division by zero.
2013-02-03 Richard Sandiford <rdsandiford@googlemail.com> 2013-02-03 Richard Sandiford <rdsandiford@googlemail.com>
Update copyright years. Update copyright years.

6
libstdc++-v3/include/bits/random.tcc
View File

@ -1658,6 +1658,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
do do
{ {
const double __e = -std::log(1.0 - __aurng()); const double __e = -std::log(1.0 - __aurng());
if (__t == __x)
{
if (__e)
return __x;
continue;
}
__sum += __e / (__t - __x); __sum += __e / (__t - __x);
__x += 1; __x += 1;
} }