construct/include/ircd/js/priv.h

/*
 * 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_PRIV_H

namespace ircd {
namespace js   {

IRCD_EXCEPTION(error, priv_error)

template<class T = void>
T &
priv(const JS::HandleObject &obj,
     const JSClass &jsc)
{
	const auto ret(JS_GetInstancePrivate(*cx, obj, &jsc, nullptr));
	if(!ret)
		throw priv_error("Object has no private data");

	return *static_cast<T *>(ret);
}

template<class T = void>
T &
priv(const JS::HandleObject &obj)
{
	const auto jsc(JS_GetClass(obj));
	if(unlikely(!jsc))
		throw priv_error("Object has no JSClass");

	return priv<T>(obj, jsc);
}

} // namespace js
} // namespace ircd