mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 12:12:15 +02:00
e3b0bf4f5c
Also added better comments for MSF::find(). Signed-off-by: James Yonan <james@openvpn.net>
91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2019 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// map/set find
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#pragma once
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#include <utility>
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namespace openvpn {
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namespace MSF {
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template <typename ITERATOR>
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class Iter : public ITERATOR
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{
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public:
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template <typename MAP_SET>
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Iter(const MAP_SET& ms, ITERATOR&& iter)
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: ITERATOR(std::move(iter)),
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exists_(*this != ms.end())
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{
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}
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Iter(ITERATOR&& iter)
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: ITERATOR(std::move(iter)),
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exists_(true)
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{
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}
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explicit operator bool() const
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{
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return exists_;
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}
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private:
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bool exists_;
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};
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// Like ordinary map/set find, but returns an iterator
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// that defines an operator bool() method for testing if
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// the iterator is defined, so instead of:
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//
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// if (iter != map.end())
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// do_stuff();
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//
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// you can say:
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//
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// if (iter)
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// do_stuff();
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//
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template <typename MAP_SET, typename KEY>
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inline auto find(MAP_SET& ms, const KEY& k)
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{
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return Iter<decltype(ms.find(k))>(ms, ms.find(k));
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}
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// Does key exist in map/set?
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template <typename MAP_SET, typename KEY>
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inline bool exists(MAP_SET& ms, const KEY& k)
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{
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return ms.find(k) != ms.end();
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}
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// Convert an ordinary, dereferenceable iterator to an MSF::Iter
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template <typename ITERATOR>
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inline auto iter(ITERATOR i)
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{
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return Iter<ITERATOR>(std::move(i));
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}
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}
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}
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