[thin_repair] repair now checks the data reference counts.

error_set.cc

@@ -0,0 +1,80 @@
+#include "error_set.h"
+
+#include <iostream>
+
+using namespace persistent_data;
+
+//----------------------------------------------------------------
+
+error_set::error_set(std::string const &err)
+	: err_(err) {
+}
+
+std::string const &
+error_set::get_description() const
+{
+	return err_;
+}
+
+std::list<error_set::ptr> const &
+error_set::get_children() const
+{
+	return children_;
+}
+
+void
+error_set::add_child(error_set::ptr err)
+{
+	children_.push_back(err);
+}
+
+void
+error_set::add_child(std::string const &err)
+{
+	error_set::ptr e(new error_set(err));
+	add_child(e);
+}
+
+//--------------------------------
+
+namespace {
+	void indent_by(std::ostream &out, unsigned indent) {
+		for (unsigned i = 0; i < indent; i++)
+			out << ' ';
+	}
+
+	void print_errs(std::ostream &out, error_set::ptr e, unsigned depth, unsigned indent) {
+		if (depth == 0)
+			return;
+
+		indent_by(out, indent);
+
+		out << e->get_description() << std::endl;
+		if (depth > 1) {
+			auto children = e->get_children();
+			for (auto it = children.begin(); it != children.end(); ++it)
+				print_errs(out, *it, depth - 1, indent + 2);
+		}
+	}
+}
+
+error_selector::error_selector(error_set::ptr errs, unsigned depth)
+	: errs_(errs),
+	  depth_(depth)
+{
+}
+
+void
+error_selector::print(std::ostream &out) const
+{
+	print_errs(out, errs_, depth_, 0);
+}
+
+std::ostream &
+persistent_data::operator << (std::ostream &out, error_selector const &errs)
+{
+	errs.print(out);
+	return out;
+}
+
+//----------------------------------------------------------------