56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
#ifndef SPACE_MAP_H
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#define SPACE_MAP_H
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#include "block.h"
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#include <boost/shared_ptr.hpp>
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//----------------------------------------------------------------
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namespace persistent_data {
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typedef uint32_t ref_t;
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class space_map {
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public:
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typedef boost::shared_ptr<space_map> ptr;
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virtual ~space_map() {};
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virtual block_address get_nr_blocks() const = 0;
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virtual block_address get_nr_free() const = 0;
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virtual ref_t get_count(block_address b) const = 0;
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virtual void set_count(block_address b, ref_t c) = 0;
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virtual void commit() = 0;
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virtual void inc(block_address b) = 0;
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virtual void dec(block_address b) = 0;
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virtual block_address new_block() = 0;
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virtual bool count_possibly_greater_than_one(block_address b) const = 0;
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virtual void extend(block_address extra_blocks) = 0;
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struct iterator {
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virtual ~iterator() {}
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virtual void operator() (block_address b, ref_t c) = 0;
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};
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virtual void iterate(iterator &it) const {
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throw std::runtime_error("not implemented");
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}
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};
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class persistent_space_map : public space_map {
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public:
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typedef boost::shared_ptr<persistent_space_map> ptr;
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virtual size_t root_size() = 0;
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virtual void copy_root(void *dest, size_t len) = 0;
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};
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}
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//----------------------------------------------------------------
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#endif
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