Update of /cvsroot/boost/boost/boost/random/detail
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv24504
Modified Files:
const_mod.hpp
Log Message:
fix bug 1505014: avoid signed overflow in modular addition
Index: const_mod.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/random/detail/const_mod.hpp,v
retrieving revision 1.8
retrieving revision 1.9
diff -u -d -r1.8 -r1.9
--- const_mod.hpp 27 Jul 2004 03:43:32 -0000 1.8
+++ const_mod.hpp 29 Jun 2006 23:17:14 -0000 1.9
@@ -43,10 +43,10 @@
template<class IntType>
static IntType add(IntType m, IntType x, IntType c)
{
- x += (c-m);
- if(x < 0)
- x += m;
- return x;
+ if (x < m - c)
+ return x + c;
+ else
+ return x - (m-c);
}
};
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