enable implicit conversion from List

Author: Enchufa2

inst/include/Rcpp/DataFrame.h

@@ -47,8 +47,9 @@ namespace Rcpp{
             set__(other) ;
         }
 
-        template <typename T>
-        explicit DataFrame_Impl( const T& obj ) ;
+        template <typename T,
+                  typename std::enable_if<std::is_convertible<T, SEXP>::value, int>::type = 0>
+        DataFrame_Impl( const T& obj ) ;
 
         DataFrame_Impl& operator=( DataFrame_Impl& other){
             if (*this != other) set__(other);

inst/include/Rcpp/api/meat/DataFrame.h

@@ -1,4 +1,5 @@
-// Copyright (C) 2013 Romain Francois
+// Copyright (C) 2013 - 2025 Romain Francois
+// Copyright (C) 2026        Romain Francois and Iñaki Ucar
 //
 // This file is part of Rcpp.
 //
@@ -21,7 +22,8 @@
 namespace Rcpp{
 
      template <template <class> class StoragePolicy>
-     template <class T>
+     template <class T,
+               typename std::enable_if<std::is_convertible<T, SEXP>::value, int>::type>
      DataFrame_Impl<StoragePolicy>::DataFrame_Impl( const T& obj){
         set__(Shield<SEXP>(wrap(obj)));
      }