Added c++ wrappers for get_flags

Also added errcall initializer
Addresses #240

git-svn-id: file:///svn/tokudb@1500 c7de825b-a66e-492c-adef-691d508d4ae1

cxx/dbenv.cpp

@@ -3,7 +3,8 @@
 #include <stdarg.h>
 
 DbEnv::DbEnv (u_int32_t flags)
-    : do_no_exceptions((flags&DB_CXX_NO_EXCEPTIONS)!=0)
+    : do_no_exceptions((flags&DB_CXX_NO_EXCEPTIONS)!=0),
+      errcall(NULL)
 {
     int ret = db_env_create(&the_env, flags & ~DB_CXX_NO_EXCEPTIONS);
     assert(ret==0); // should do an error.
@@ -110,6 +111,11 @@ void DbEnv::set_errfile(FILE *errfile) {
     the_env->set_errfile(the_env, errfile);
 }
 
+int DbEnv::get_flags(u_int32_t *flagsp) {
+    int ret = the_env->get_flags(the_env, flagsp);
+    return maybe_throw_error(ret);
+}
+
 extern "C" void toku_db_env_errcall_c(DB_ENV *dbenv_c, const char *errpfx, const char *msg) {
     DbEnv *dbenv = (DbEnv *) dbenv_c->api1_internal;
     dbenv->errcall(dbenv, errpfx, msg);

include/db_cxx.h

@@ -159,6 +159,7 @@ class DbEnv {
     void err(int error, const char *fmt, ...);
     void set_errfile(FILE *errfile);
     void set_errcall(void (*)(const DbEnv *, const char *, const char *));
+    int get_flags(u_int32_t *flagsp);
 
     // locking
 #if DB_VERSION_MAJOR<4 || (DB_VERSION_MAJOR==4 && DB_VERSION_MINOR<=4)