the exception class is implemented, and for db.cpp and dbenv.cpp it is called. Still need to do exceptions for dbc.cpp dbt.cpp txn.cpp. Addresses #215.

git-svn-id: file:///svn/tokudb@1301 c7de825b-a66e-492c-adef-691d508d4ae1

cxx/exception.cpp

@@ -0,0 +1,38 @@
+#include <db.h>
+#include <db_cxx.h>
+
+DbException::~DbException() throw()
+{
+    if (the_what!=0) {
+	delete [] the_what;
+    }
+}
+
+DbException::DbException(int err)
+    :   the_err(err),
+	the_env(0)
+{
+    FillTheWhat();
+}
+
+void DbException::FillTheWhat(void)
+{
+    if (the_err!=0) {
+	the_what = strdup(db_strerror(the_err));
+    }
+}
+
+int DbException::get_errno() const
+{
+    return the_err;
+}
+
+const char *DbException::what() const throw()
+{
+    return the_what;
+}
+
+DbEnv *DbException::get_env() const
+{
+    return the_env;
+}