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Fix PR#20843: binomial_distribution<unsigned> is broken. Add test to ensure that signed and unsigned verstions produce the same sequence.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@217976 91177308-0d34-0410-b5e6-96231b3b80d8
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Marshall Clow
2014-09-17 18:33:58 +00:00
parent 6d9505ad8a
commit 5ffb8d0fbe
2 changed files with 15 additions and 1 deletions
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5
include/random
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@@ -4009,6 +4009,8 @@ binomial_distribution<_IntType>::param_type::param_type(result_type __t, double
}
}
// Reference: Kemp, C.D. (1986). `A modal method for generating binomial
// variables', Commun. Statist. - Theor. Meth. 15(3), 805-813.
template<class _IntType>
template<class _URNG>
_IntType
@@ -4035,7 +4037,8 @@ binomial_distribution<_IntType>::operator()(_URNG& __g, const param_type& __pr)
if (__u < 0)
return __rd - 1;
}
--__rd;
if ( __rd != 0 )
--__rd;
++__ru;
if (__ru <= __pr.__t_)
{