From 4e8e5e7409fc16409708831b73be541bd952eb48 Mon Sep 17 00:00:00 2001
From: Rasmus Munk Larsen <rmlarsen@google.com>
Date: Tue, 1 Oct 2024 11:45:06 -0700
Subject: [PATCH] Add max_digits10 in NumTraits for mpreal types.

---
 unsupported/Eigen/MPRealSupport | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/unsupported/Eigen/MPRealSupport b/unsupported/Eigen/MPRealSupport
index ba9d7c9c4..322ff45fb 100644
--- a/unsupported/Eigen/MPRealSupport
+++ b/unsupported/Eigen/MPRealSupport
@@ -95,6 +95,10 @@ struct NumTraits<mpfr::mpreal> : GenericNumTraits<mpfr::mpreal> {
     return std::numeric_limits<Real>::digits10(Precision);
   }
   static inline int digits10(const Real& x) { return std::numeric_limits<Real>::digits10(x); }
+ 
+  static inline int max_digits10(long Precision = mpfr::mpreal::get_default_prec()) {
+    return std::numeric_limits<Real>::max_digits10(Precision);
+  }
 
   static inline int digits() { return std::numeric_limits<Real>::digits(); }
   static inline int digits(const Real& x) { return std::numeric_limits<Real>::digits(x); }