cached_index.h

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#ifndef META_CACHED_INDEX_H_
#define META_CACHED_INDEX_H_

#include <memory>

namespace cpptoml
{
class table;
}

namespace meta
{
namespace index
{

template <class Index, template <class, class> class Cache>
class cached_index : public Index
{
  public:
    using Index::Index;

    template <class... Args>
    cached_index(cpptoml::table& config, Args&&... args);

    using primary_key_type = typename Index::primary_key_type;
    using secondary_key_type = typename Index::secondary_key_type;
    using postings_data_type = typename Index::postings_data_type;

    virtual std::shared_ptr<postings_data_type>
        search_primary(primary_key_type p_id) const override;

    void clear_cache();

  private:
    mutable Cache<primary_key_type, std::shared_ptr<postings_data_type>> cache_;
};
}
}

#include "index/cached_index.tcc"
#endif