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force_exact.hh
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// Copyright (C) 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE)
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//
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// This file is part of Olena.
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//
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// Olena is free software: you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation, version 2 of the License.
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//
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// Olena is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Olena. If not, see <http://www.gnu.org/licenses/>.
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//
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// As a special exception, you may use this file as part of a free
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// software project without restriction. Specifically, if other files
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// instantiate templates or use macros or inline functions from this
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// file, or you compile this file and link it with other files to produce
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// an executable, this file does not by itself cause the resulting
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// executable to be covered by the GNU General Public License. This
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// exception does not however invalidate any other reasons why the
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// executable file might be covered by the GNU General Public License.
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#ifndef MLN_CORE_INTERNAL_FORCE_EXACT_HH
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# define MLN_CORE_INTERNAL_FORCE_EXACT_HH
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#include <cstddef>
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namespace
mln
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{
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namespace
internal
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{
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template
<
typename
E,
typename
T>
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E& force_exact(
const
T& ref)
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{
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static
const
E* exact_obj;
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static
const
T& exact_obj_ref = *exact_obj;
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static
const
ptrdiff_t exact_offset =
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(
const
char
*)(
void
*)(&exact_obj_ref)
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- (
const
char
*)(
void
*)(exact_obj);
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return
*(E*)((
char
*)(&ref) - exact_offset);
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}
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}
// end of namespace mln::internal
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}
// end of namespace mln
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#endif // ! MLN_CORE_INTERNAL_FORCE_EXACT_HH
mln
core
internal
force_exact.hh
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