It would; you'd just have to supply a custom "free_deleter" in the definition of the unique_ptr that calls free instead of delete. I've used this for Windows System calls like GetAddrInfoExW which requires calling FreeAddrInfoEx when you're done.

    std::unique_ptr<ADDRINFOEXW, addrinfo_deleter> holder;
    ADDRINFOEXW hint = { .ai_family = AF_UNSPEC };
    if (const auto result = GetAddrInfoExW(
        sHost
        , nullptr
        , NS_ALL
        , nullptr
        , &hint
        , std::out_ptr(holder)
        , nullptr
        , nullptr
        , nullptr
        , nullptr); result != ERROR_SUCCESS) {
        // print error here
    }