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3f5b339fc5
tak czy siak lua/src jest wykorzystywane w include :( nie umiem zmusić mojego programu svn do współpracy, zwłaszcz z VC
63 lines
2.8 KiB
C++
63 lines
2.8 KiB
C++
// Copyright (c) 2003 Daniel Wallin and Arvid Norberg
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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// OR OTHER DEALINGS IN THE SOFTWARE.
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#include "stdafx.h"
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#include <luabind/lua_include.hpp>
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#include <luabind/luabind.hpp>
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#include <luabind/detail/implicit_cast.hpp>
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namespace luabind { namespace detail {
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// returns -1 if there exists no implicit cast from the given class_rep
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// to T. If there exists an implicit cast to T, the number of steps times
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// 2 is returned and pointer_offset is filled with the number of bytes
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// the pointer have to be offseted to perform the cast the reason why we
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// return the number of cast-steps times two, instead of just the number
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// of steps is to be consistent with the function matchers. They have to
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// give one matching-point extra to match const functions. There may be
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// two functions that match their parameters exactly, but there is one
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// const function and one non-const function, then (if the this-pointer
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// is non-const) both functions will match. To avoid amiguaties, the const
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// version will get one penalty point to make the match-selector select
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// the non-const version. If the this-pointer is const, there's no
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// problem, since the non-const function will not match at all.
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int implicit_cast(
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class_rep const* crep
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, LUABIND_TYPE_INFO const& type_id
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, int& pointer_offset)
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{
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int offset = 0;
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if (LUABIND_TYPE_INFO_EQUAL(crep->type(), type_id)) return 0;
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for (std::vector<class_rep::base_info>::const_iterator i =
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crep->bases().begin(); i != crep->bases().end(); ++i)
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{
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int steps = implicit_cast(i->base, type_id, offset);
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pointer_offset = offset + i->pointer_offset;
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if (steps >= 0) return steps + 2;
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}
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return -1;
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}
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}}
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