added walk.cc

walk.cc

@@ -0,0 +1,31 @@
+#include "walk.h"
+
+namespace ledger {
+
+class sum_in_account
+{
+ public:
+  void operator()(transaction_t * xact) const {
+    xact->account->value += *xact;
+  }
+};
+
+void calc__accounts(account_t * account,
+		    item_predicate<transaction_t>& pred_functor,
+		    unsigned int flags)
+{
+  sum_in_account functor;
+
+  for (transactions_list::iterator i = account->transactions.begin();
+       i != account->transactions.end();
+       i++)
+    if (pred_functor(*i))
+      handle_transaction(*i, functor, flags);
+
+  for (accounts_map::iterator i = account->accounts.begin();
+       i != account->accounts.end();
+       i++)
+    calc__accounts((*i).second, pred_functor, flags);
+}
+
+} // namespace ledger