path to dll containing a function

get_module_path

std::string get_module_path(void* address)
{
    char path[FILENAME_MAX];
    HMODULE hm = NULL;

    if (!GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
        GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
        (LPCSTR)address,
        &hm))
    {
        std::ostringstream oss;
        oss << "GetModuleHandle returned " << GetLastError();
        throw std::runtime_error(oss.str());
        
    }
    GetModuleFileNameA(hm, path, sizeof(path));

    std::string p = path;
    return p;
}

my_dll

namespace {
void foo() 
{}
} 

std::string path_to_my_dll()
{
  get_module_path(foo);
}

the function `path_to_my_dll' returns the absolute path to the dll containing it. I use this to load a companion .properties file