Program Listing for File BackendConcept.hpp

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#pragma once

#include "util/common/Result.hpp"
#include "util/db/DbTypes.hpp"

#include <concepts>
#include <span>
#include <string_view>
#include <vector>

namespace PDJE_UTIL::db::keyvalue {

template <class Backend>
concept KeyValueBackendConcept = requires(typename Backend::config_type cfg,
                                          Backend                      backend,
                                          std::string_view             key,
                                          std::span<const std::byte>   bytes,
                                          std::string_view             text) {
    typename Backend::config_type;

    { Backend::create(cfg) } -> std::same_as<common::Result<void>>;
    { Backend::destroy(cfg) } -> std::same_as<common::Result<void>>;

    { backend.open(cfg) } -> std::same_as<common::Result<void>>;
    { backend.close() } -> std::same_as<common::Result<void>>;

    { backend.contains(key) } -> std::same_as<common::Result<bool>>;
    { backend.get_text(key) } -> std::same_as<common::Result<Text>>;
    { backend.get_bytes(key) } -> std::same_as<common::Result<Bytes>>;
    { backend.put_text(key, text) } -> std::same_as<common::Result<void>>;
    { backend.put_bytes(key, bytes) } -> std::same_as<common::Result<void>>;
    { backend.erase(key) } -> std::same_as<common::Result<void>>;
    { backend.list_keys(std::string_view {}) }
    -> std::same_as<common::Result<std::vector<Key>>>;
};

} // namespace PDJE_UTIL::db::keyvalue