add sm_decrementer

space_map.cc

@@ -0,0 +1,23 @@
+#include "space_map.h"
+
+using namespace persistent_data;
+
+//----------------------------------------------------------------
+
+sm_decrementer::sm_decrementer(space_map::ptr sm, block_address b)
+	: sm_(sm),
+	  b_(b),
+	  released_(false) {
+}
+
+sm_decrementer::~sm_decrementer() {
+	if (!released_)
+		sm_->dec(b_);
+}
+
+void
+sm_decrementer::dont_bother() {
+	released_ = true;
+}
+
+//----------------------------------------------------------------