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construct/include/ircd/js/contract.h

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/*
* 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_JS_CONTRACT_H
namespace ircd {
namespace js {
struct contract
:std::weak_ptr<struct task>
{
using closure = std::function<value ()>;
heap_object future;
operator const heap_object &() const { return future; }
operator heap_object &() { return future; }
operator object() const { return future; }
operator value() const { return future; }
// Enter this closure and return or throw to complete the result contract.
void operator()(const closure &) noexcept;
// The future object is constructed using the "future" trap.
// The task is automatically found with task::get() in the overload without a task argument.
contract(struct task &, object::handle future);
contract(object::handle future);
contract(contract &&) = default;
contract(const contract &) = default;
~contract() noexcept;
};
} // namespace js
} // namespace ircd