persistent-cache-cpp
optional.h
Go to the documentation of this file.
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/*
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* Copyright (C) 2015 Canonical Ltd.
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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 Lesser General Public License version 3 as
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* 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authored by: Michi Henning <michi.henning@canonical.com>
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*/
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#pragma once
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#include <boost/optional.hpp>
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// std::optional doesn't support operator<< so core::Optional users shouldn't
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// expect it to be available. However, consumers (e.g. GoogleTest) can
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// auto-detect this operator using "ADL", so without including
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// boost/optional/optional_io.hpp they will detect the non-working one which
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// breaks the build.
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#include <boost/optional/optional_io.hpp>
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namespace
core
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{
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template
<
typename
T>
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using
Optional
= boost::optional<T>;
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}
// namespace core
core
Top-level namespace for core functionality.
Definition
cache_codec.h:24
core::Optional
boost::optional< T > Optional
Convenience typedef for nullable values.
Definition
optional.h:39
include
core
optional.h
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