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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#pragma once
#include <string>
#include <type_traits>
#include <openvpn/common/stringtempl.hpp>
namespace openvpn {
namespace StringTempl {
// empty
// for objects that define an empty method
template <typename T>
inline auto empty(const T &t) -> decltype(t.empty())
{
return t.empty();
}
// for numerical values
template <typename T,
typename std::enable_if<std::is_arithmetic<T>::value, int>::type = 0>
inline bool empty(T value)
{
return false;
}
// to_string
// for objects that define a to_string() method
template <typename T>
inline auto to_string(const T &t) -> decltype(t.to_string())
{
return t.to_string();
}
// for numerical values
template <typename T,
typename std::enable_if<std::is_arithmetic<T>::value, int>::type = 0>
inline std::string to_string(T value)
{
return std::to_string(value);
}
} // namespace StringTempl
} // namespace openvpn
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