61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
#ifndef CACHE_HINT_ARRAY_H
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#define CACHE_HINT_ARRAY_H
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#include "persistent-data/data-structures/array.h"
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#include <string>
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//----------------------------------------------------------------
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namespace caching {
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namespace hint_array_detail {
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template <uint32_t WIDTH>
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struct hint_traits {
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typedef unsigned char byte;
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typedef byte disk_type[WIDTH];
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typedef vector<byte> value_type;
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typedef no_op_ref_counter<value_type> ref_counter;
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// FIXME: slow copying for now
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static void unpack(disk_type const &disk, value_type &value) {
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for (unsigned byte = 0; byte < WIDTH; byte++)
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value.at(byte) = disk[byte];
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}
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static void pack(value_type const &value, disk_type &disk) {
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for (unsigned byte = 0; byte < WIDTH; byte++)
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disk[byte] = value.at(byte);
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}
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};
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// FIXME: data visitor stuff
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}
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class hint_array {
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public:
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typedef boost::shared_ptr<hint_array> ptr;
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typedef typename persistent_data::transaction_manager::ptr tm_ptr;
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hint_array(tm_ptr tm, unsigned width);
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hint_array(tm_ptr tm, unsigned width, block_address root, unsigned nr_entries);
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unsigned get_nr_entries() const;
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void grow(unsigned new_nr_entries, void const *v);
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block_address get_root() const;
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void get_hint(unsigned index, vector<unsigned char> &data) const;
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void set_hint(unsigned index, vector<unsigned char> const &data);
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void grow(unsigned new_nr_entries, vector<unsigned char> const &value);
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private:
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unsigned width_;
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boost::shared_ptr<persistent_data::array_base> impl_;
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};
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}
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//----------------------------------------------------------------
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#endif
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