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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/>.
// Sometimes you want to accept a <typename STRING> in a
// method, without knowing whether it's a const char *,
// const std::string&, or nullptr. These methods help with
// basic type-independent string operations.
#ifndef OPENVPN_COMMON_STRINGTEMPL_H
#define OPENVPN_COMMON_STRINGTEMPL_H
#include <string>
#include <cstddef> // for std::nullptr_t
#include <utility>
namespace openvpn {
namespace StringTempl {
// empty
inline bool empty(std::nullptr_t)
{
return true;
}
inline bool empty(const char *str)
{
return !str || str[0] == '\0';
}
inline bool empty(const std::string &str)
{
return str.empty();
}
// to_string
inline std::string to_string(std::nullptr_t)
{
return std::string();
}
inline std::string to_string(const char *str)
{
if (str)
return std::string(str);
else
return to_string(nullptr);
}
inline std::string to_string(std::string &&str)
{
return std::move(str);
}
inline const std::string &to_string(const std::string &str)
{
return str;
}
// to_cstring
inline const char *to_cstring(const std::string &str)
{
return str.c_str();
}
inline const char *to_cstring(const char *str)
{
return str;
}
} // namespace StringTempl
} // namespace openvpn
#endif
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