Fix numext::bit_cast() compilation failure in C++20
diff --git a/Eigen/src/Core/NumTraits.h b/Eigen/src/Core/NumTraits.h
index b93faae..bf41c3b 100644
--- a/Eigen/src/Core/NumTraits.h
+++ b/Eigen/src/Core/NumTraits.h
@@ -98,7 +98,10 @@
/** \internal bit-wise cast without changing the underlying bit representation. */
#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
-EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC constexpr Tgt bit_cast(const Src& src) { return std::bit_cast<Tgt>(src); }
+template <typename Tgt, typename Src>
+EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC constexpr Tgt bit_cast(const Src& src) {
+ return std::bit_cast<Tgt>(src);
+}
#elif EIGEN_HAS_BUILTIN(__builtin_bit_cast)
template <typename Tgt, typename Src>
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC constexpr Tgt bit_cast(const Src& src) {
