update boost to 1.44

[features.git] / boost / boost / functional / hash / detail / hash_float_generic.hpp

diff --git a/boost/boost/functional/hash/detail/hash_float_generic.hpp b/boost/boost/functional/hash/detail/hash_float_generic.hpp
index f9acee9cd1ecb34ced8fe5cdca5fb3d7d066162a..fdbf53fe57a7cc1ff0693e0a62e0f4fdf8e9db78 100644 (file)
--- a/boost/boost/functional/hash/detail/hash_float_generic.hpp
+++ b/boost/boost/functional/hash/detail/hash_float_generic.hpp
@@ -51,17 +51,15 @@ namespace boost
                     limits<T>::min_exponent;
             }
 
-            // The result of frexp is always between 0.5 and 1, so its
-            // top bit will always be 1. Subtract by 0.5 to remove that.
-            v -= T(0.5);
-            v = ldexp(v, limits<std::size_t>::digits + 1);
+            v = ldexp(v, limits<std::size_t>::digits);
             std::size_t seed = static_cast<std::size_t>(v);
             v -= seed;
 
             // ceiling(digits(T) * log2(radix(T))/ digits(size_t)) - 1;
             std::size_t const length
                 = (limits<T>::digits *
-                        boost::static_log2<limits<T>::radix>::value - 1)
+                        boost::static_log2<limits<T>::radix>::value
+                        + limits<std::size_t>::digits - 1)
                 / limits<std::size_t>::digits;
 
             for(std::size_t i = 0; i != length; ++i)