implicit_cast.hpp

魔兽世界的私服源程序

// Copyright (c) 2003 Daniel Wallin and Arvid Norberg

// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.


#ifndef LUABIND_IMPLICIT_CAST_HPP_INCLUDED
#define LUABIND_IMPLICIT_CAST_HPP_INCLUDED

#include <luabind/config.hpp>
#include <luabind/detail/class_rep.hpp>

namespace luabind { namespace detail
{
	// returns -1 if there exists no implicit cast from the given class_rep
	// to T. If there exists an implicit cast to T, the number of steps times 2
	// is returned and pointer_offset is filled with the number of bytes
	// the pointer have to be offseted to perform the cast
	// the reason why we return the number of cast-steps times two, instead of
	// just the number of steps is to be consistent with the function matchers. They
	// have to give one matching-point extra to match const functions. There may be
	// two functions that match their parameters exactly, but there is one const
	// function and one non-const function, then (if the this-pointer is non-const)
	// both functions will match. To avoid amiguaties, the const version will get
	// one penalty point to make the match-selector select the non-const version. It
	// the this-pointer is const, there's no problem, since the non-const function
	// will not match at all.

	int implicit_cast(const class_rep*, LUABIND_TYPE_INFO const&, int&);

}}

#endif // LUABIND_IMPLICIT_CAST_HPP_INCLUDED