Fix PR#20843: binomial_distribution<unsigned> is broken. Add test to ensure that signed and unsigned verstions produce the same sequence. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@217976 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/random b/include/random index c0db1ab..e7053ce 100644 --- a/include/random +++ b/include/random
@@ -4009,6 +4009,8 @@ } } +// 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 @@ if (__u < 0) return __rd - 1; } - --__rd; + if ( __rd != 0 ) + --__rd; ++__ru; if (__ru <= __pr.__t_) { 