thin-provisioning-tools/persistent-data/space-maps/noop.h
Joe Thornber 5e5409f48b [space-map/noop] Be explicit about returning an optional
Needed for older version of g++
2019-06-05 11:07:28 +01:00

104 lines
2.1 KiB
C++

// Copyright (C) 2019 Red Hat, Inc. All rights reserved.
//
// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
#ifndef NOOP_MAP_H
#define NOOP_MAP_H
#include "persistent-data/space_map.h"
//----------------------------------------------------------------
namespace persistent_data {
class noop_map : public checked_space_map {
public:
typedef boost::shared_ptr<noop_map> ptr;
block_address get_nr_blocks() const {
fail();
return 0;
}
block_address get_nr_free() const {
fail();
return 0;
}
ref_t get_count(block_address b) const {
fail();
return 0;
}
void set_count(block_address b, ref_t c) {
fail();
}
void commit() {
fail();
}
void inc(block_address b) {
fail();
}
void dec(block_address b) {
fail();
}
maybe_block find_free(span_iterator &it) {
fail();
return boost::optional<block_address>(0);
}
bool count_possibly_greater_than_one(block_address b) const {
fail();
return false;
}
void extend(block_address extra_blocks) {
fail();
}
void count_metadata(block_counter &bc) const {
fail();
}
size_t root_size() const {
fail();
return 0;
}
virtual void copy_root(void *dest, size_t len) const {
fail();
}
checked_space_map::ptr clone() const {
return ptr(new noop_map());
}
private:
void fail() const {
throw std::runtime_error("noop space map used");
}
};
}
//----------------------------------------------------------------
#endif