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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/>.
// map/set find
#pragma once
#include <utility>
namespace openvpn {
namespace MSF {
template <typename ITERATOR>
class Iter : public ITERATOR
{
public:
template <typename MAP_SET>
Iter(const MAP_SET &ms, ITERATOR &&iter)
: ITERATOR(std::move(iter)),
exists_(*this != ms.end())
{
}
Iter(ITERATOR &&iter)
: ITERATOR(std::move(iter)),
exists_(true)
{
}
explicit operator bool() const
{
return exists_;
}
private:
bool exists_;
};
// Like ordinary map/set find, but returns an iterator
// that defines an operator bool() method for testing if
// the iterator is defined, so instead of:
//
// if (iter != map.end())
// do_stuff();
//
// you can say:
//
// if (iter)
// do_stuff();
//
template <typename MAP_SET, typename KEY>
inline auto find(MAP_SET &ms, const KEY &k)
{
return Iter<decltype(ms.find(k))>(ms, ms.find(k));
}
// Does key exist in map/set?
template <typename MAP_SET, typename KEY>
inline bool exists(MAP_SET &ms, const KEY &k)
{
return ms.find(k) != ms.end();
}
// Convert an ordinary, dereferenceable iterator to an MSF::Iter
template <typename ITERATOR>
inline auto iter(ITERATOR i)
{
return Iter<ITERATOR>(std::move(i));
}
} // namespace MSF
} // namespace openvpn
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