thin-provisioning-tools/error_set.h

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#ifndef ERROR_SET_H
#define ERROR_SET_H
#include <boost/shared_ptr.hpp>
#include <list>
#include <iosfwd>
#include <string>
//----------------------------------------------------------------
namespace persistent_data {
// When checking the metadata for a thin device we don't want to
// stop at the first error. Instead should collect as much
// information as possible. The errors are hierarchical, so the
// user can control how much detail is displayed.
class error_set {
public:
typedef boost::shared_ptr<error_set> ptr;
error_set(std::string const &err);
std::string const &get_description() const;
std::list<error_set::ptr> const &get_children() const;
void add_child(error_set::ptr err);
void add_child(std::string const &err);
private:
std::string err_;
std::list<error_set::ptr> children_;
};
// The error_selector is a little proxy class used when printing
// errors to a stream.
class error_selector {
public:
error_selector(error_set::ptr errs, unsigned depth);
void print(std::ostream &out) const;
private:
error_set::ptr errs_;
unsigned depth_;
};
std::ostream &operator << (std::ostream &out, error_selector const &errs);
}
//----------------------------------------------------------------
#endif