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Fix needle-in-haystack bug found by Walter Brown 

llvm-svn: 137617
This commit is contained in:
Howard Hinnant 2011-08-15 17:22:22 +00:00
parent 30694dcdeb
commit 052fd9349f
1 changed files with 4 additions and 1 deletions
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5
libcxx/include/random
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@ -2562,8 +2562,11 @@ subtract_with_carry_engine<_UIntType, __w, __s, __r>::seed(result_type __sd,
linear_congruential_engine<result_type, 40014u, 0u, 2147483563u>
__e(__sd == 0u ? default_seed : __sd);
for (size_t __i = 0; __i < __r; ++__i)
{
result_type __e0 = __e();
__x_[__i] = static_cast<result_type>(
(__e() + ((uint64_t)__e() << 32)) & _Max);
(__e0 + ((uint64_t)__e() << 32)) & _Max);
}
__c_ = __x_[__r-1] == 0;
__i_ = 0;
}