Cross platform directory exists check

gistfile1.cpp

bool directoryExists(const std::string &directory)
{
    if(!directory.empty())
    {
        if(access(directory.c_str(), 0) == 0)
        {
            struct stat status;
            stat(directory.c_str(), &status);
            if(status.st_mode & S_IFDIR)
                return true;
        }
    }
    return false;
}