implement Db::set_error_stream. closes #257

git-svn-id: file:///svn/tokudb@1610 c7de825b-a66e-492c-adef-691d508d4ae1

cxx/db.cpp

@@ -166,3 +166,7 @@ int Db::associate(DbTxn *txnid, Db *secondary, int (*callback)(Db *secondary, co
     int ret = the_db->associate(the_db, txnid->get_DB_TXN(), secondary->get_DB(), toku_associate_callback_c, flags);
     return the_Env->maybe_throw_error(ret);
 }
+
+void Db::set_error_stream(std::ostream *new_error_stream) {
+    the_Env->set_error_stream(new_error_stream);
+}

include/db_cxx.h

@@ -127,6 +127,8 @@ class Db {
 
     int fd(int *);
 
+    void set_error_stream(std::ostream *);
+
     /* the cxx callbacks must be public so they can be called by the c callback.  But it's really private. */
     int (*associate_callback_cxx)(Db *, const Dbt *, const Dbt *, Dbt*);
     int (*bt_compare_callback_cxx)(Db *, const Dbt *, const Dbt *);