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-rwxr-xr-xunsupported/Eigen/src/AutoDiff/AutoDiffScalar.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
index 50fedf6ac..279fe5cd3 100755
--- a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
+++ b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
@@ -108,7 +108,9 @@ class AutoDiffScalar
template<typename OtherDerType>
AutoDiffScalar(const AutoDiffScalar<OtherDerType>& other
#ifndef EIGEN_PARSED_BY_DOXYGEN
- , typename internal::enable_if<internal::is_same<Scalar, typename internal::traits<typename internal::remove_all<OtherDerType>::type>::Scalar>::value,void*>::type = 0
+ , typename internal::enable_if<
+ internal::is_same<Scalar, typename internal::traits<typename internal::remove_all<OtherDerType>::type>::Scalar>::value
+ && internal::is_convertible<OtherDerType,DerType>::value , void*>::type = 0
#endif
)
: m_value(other.value()), m_derivatives(other.derivatives())
@@ -681,4 +683,11 @@ template<typename DerType> struct NumTraits<AutoDiffScalar<DerType> >
}
+namespace std {
+template <typename T>
+class numeric_limits<Eigen::AutoDiffScalar<T> >
+ : public numeric_limits<typename T::Scalar> {};
+
+} // namespace std
+
#endif // EIGEN_AUTODIFF_SCALAR_H