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future.hpp
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/**
* @file svnxx/detail/future.hpp
* @copyright
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
* @endcopyright
*/
#ifndef SVNXX_DETAIL_FUTURE_HPP
#define SVNXX_DETAIL_FUTURE_HPP
#include <future>
#include <memory>
namespace apache {
namespace subversion {
namespace svnxx {
namespace detail {
namespace future_ {
// Forward delcaration of the future result context.
class result;
using shared_ptr = std::shared_ptr<result>;
using unique_ptr = std::unique_ptr<result>;
// Base class for template shared_future.
class shared_future_base
{
protected:
shared_future_base() noexcept {}
shared_future_base(const shared_future_base& that)
: shared_result(that.shared_result)
{}
shared_future_base(shared_future_base&& that)
: shared_result(std::move(that.shared_result))
{}
explicit shared_future_base(shared_ptr shared_result_)
: shared_result(shared_result_)
{}
private:
shared_ptr shared_result;
};
// Template forward declaration for shared_future constructor.
template<typename T> class future;
/**
* @ingroup svnxx_detail
* @brief like <tt>std::shared_future</tt>, but also maintains
* internal state relevant to the asynchronous SVN++ operation.
*/
template<typename T>
class shared_future : private std::shared_future<T>,
private shared_future_base
{
protected:
using inherited = std::shared_future<T>;
shared_future(inherited&& that, shared_ptr shared_result_) noexcept
: inherited(that), shared_future_base(shared_result_)
{}
public:
shared_future() noexcept {}
shared_future(const shared_future& that) noexcept
: inherited(that), shared_future_base(that)
{}
shared_future(shared_future&& that) noexcept
: inherited(std::move(that)), shared_future_base(std::move(that))
{}
shared_future(future<T>&& that) noexcept;
using inherited::get;
using inherited::valid;
using inherited::wait;
using inherited::wait_for;
using inherited::wait_until;
};
// Base class for template future.
class future_base
{
protected:
future_base() noexcept;
~future_base() noexcept;
future_base(future_base&& that) noexcept;
future_base(const future_base&) = delete;
explicit future_base(unique_ptr&& unique_result_) noexcept;
shared_ptr share() noexcept;
private:
unique_ptr unique_result;
};
/**
* @ingroup svnxx_detail
* @brief like <tt>std::future</tt>, but also maintains internal
* state relevant to the asynchronous SVN++ operation.
*/
template<typename T>
class future : private std::future<T>,
private future_base
{
// shared_future constructor must be able to access our base classes.
friend class shared_future<T>;
protected:
using inherited = std::future<T>;
future(inherited&& that, unique_ptr&& unique_result_) noexcept
: inherited(std::move(that)), future_base(std::move(unique_result_))
{}
public:
future() noexcept {}
future(future&& that) noexcept
: inherited(std::move(that)), future_base(std::move(that))
{}
shared_future<T> share() noexcept
{
return shared_future<T>(std::move(*this));
}
using inherited::get;
using inherited::valid;
using inherited::wait;
using inherited::wait_for;
using inherited::wait_until;
};
// Implement the constructor here since it has to see the whole future class.
template<typename T>
inline shared_future<T>::shared_future(future<T>&& that) noexcept
: inherited(std::move(that)), shared_future_base(that.future_base::share())
{}
} // namespace future_
template<typename T> using future = future_::future<T>;
template<typename T> using shared_future = future_::shared_future<T>;
} // namespace detail
} // namespace svnxx
} // namespace subversion
} // namespace apache
#endif // SVNXX_DETAIL_FUTURE_HPP
apache::subversion::svnxx::detail::future_::future
like std::future, but also maintains internal state relevant to the asynchronous SVN++ operation.
Definition future.hpp:129
apache::subversion::svnxx::detail::future_::shared_future_base
Definition future.hpp:45
apache::subversion::svnxx::detail::future_::shared_future
like std::shared_future, but also maintains internal state relevant to the asynchronous SVN++ operati...
Definition future.hpp:76