libcruft-util/cruft/util/stringcache.hpp

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/******************************************************************************
_ _
| | | |
| | ___ | |__ ___
| |/ _ \| '_ \ / _ \
| | (_) | |_) | (_) |
|_|\___/|_.__/ \___/
Copyright:
Danny Robson, 2020
*****************************************************************************/
#pragma once
#include "./std.hpp"
#include <string>
#include <string_view>
#include <vector>
namespace cruft {
/// Stores strings in a single block of memory where they can be indexed
/// by an integral id, and compacted to save space as required.
class stringcache {
using value_type = i16;
public:
enum id_t : value_type {};
std::string_view operator[] (id_t);
id_t add (std::string_view);
id_t add (std::string const &);
id_t add (char const*);
private:
struct slot_t {
value_type start;
value_type length;
};
std::vector<slot_t> m_values;
std::vector<char> m_store;
};
}