query.hpp

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#pragma once
 
#include "ublk/ublk_cmd.h"
#include <condy.hpp>
#include <utility>
 
namespace ublk {
 
namespace detail {
namespace ex = condy::detail::ex;
}

struct fetch_dev_info_t {
    template <typename Env>
        requires requires(const Env &env) {
            env.query(std::declval<fetch_dev_info_t>());
        }
    constexpr const ublksrv_ctrl_dev_info *
    operator()(const Env &env) const noexcept {
        return env.query(fetch_dev_info_t{});
    }
 
    template <typename Env>
        requires(!requires(const Env &env) {
            env.query(std::declval<fetch_dev_info_t>());
        })
    constexpr const ublksrv_ctrl_dev_info *
    operator()(const Env &) const noexcept {
        return nullptr;
    }
 
    [[nodiscard]]
    static consteval bool query(detail::ex::forwarding_query_t) noexcept {
        return true;
    }
};

inline constexpr fetch_dev_info_t fetch_dev_info{};
 
} // namespace ublk