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construct/include/ircd/ctx_shared_state.h
2016-09-22 16:18:33 -07:00

100 lines
2.4 KiB
C++

/*
* Copyright (C) 2016 Charybdis Development Team
* Copyright (C) 2016 Jason Volk <jason@zemos.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#define HAVE_IRCD_CTX_SHARED_STATE_H
namespace ircd {
namespace ctx {
struct shared_state_base
{
dock cond;
std::exception_ptr eptr;
bool finished = false;
void reset();
};
template<class T = void>
struct shared_state
:shared_state_base
,std::enable_shared_from_this<shared_state<T>>
{
using value_type = T;
using pointer_type = T *;
using reference_type = T &;
T val;
std::shared_ptr<const shared_state<T>> share() const;
std::shared_ptr<shared_state<T>> share();
};
template<>
struct shared_state<void>
:shared_state_base
,std::enable_shared_from_this<shared_state<void>>
{
using value_type = void;
std::shared_ptr<const shared_state<void>> share() const;
std::shared_ptr<shared_state<void>> share();
};
inline std::shared_ptr<shared_state<void>>
shared_state<void>::share()
{
return this->shared_from_this();
}
template<class T>
std::shared_ptr<shared_state<T>>
shared_state<T>::share()
{
return this->shared_from_this();
}
inline std::shared_ptr<const shared_state<void>>
shared_state<void>::share()
const
{
return this->shared_from_this();
}
template<class T>
std::shared_ptr<const shared_state<T>>
shared_state<T>::share()
const
{
return this->shared_from_this();
}
inline void
shared_state_base::reset()
{
eptr = nullptr;
finished = false;
}
} // namespace ctx
} // namespace ircd