C++ (Cpp) repository::install_script_path示例

///
/// Convenience method to obtain the SHA256 hash of a given script
///
std::string
calculate_script_hash(const repository &repo,
                      const script_action &action,
                      const std::string &script_path)
{
    switch (action) {
        case script_action::install:
        {
            string path = repo.install_script_path() + "/" + script_path;
            ifstream ifs{path.c_str()};
            return read_install_statements(ifs).sha256_sum();
        }
        case script_action::upgrade:
        {
            string path = repo.upgrade_script_path() + "/" + script_path;
            ifstream ifs{path.c_str()};
            return read_upgrade_statements(ifs).sha256_sum();
        }
        case script_action::rollback:
        {
            string path = repo.upgrade_script_path() + "/" + script_path;
            ifstream ifs{path.c_str()};
            return read_rollback_statements(ifs).sha256_sum();
        }
    }
    throw std::out_of_range{to_string(action)};
}