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zero.hh
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// Copyright (C) 2007, 2008, 2009, 2011 EPITA Research and Development
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// 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_LITERAL_ZERO_HH
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# define MLN_LITERAL_ZERO_HH
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# include <mln/core/concept/literal.hh>
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# include <mln/metal/converts_to.hh>
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namespace
mln
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{
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namespace
literal
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{
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struct
zero_t
:
public
Literal
<zero_t>
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{
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// This default constructor is needed for compilation with gcc
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// 4.6.0, gcc 4.6.1 and Clang.
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zero_t
();
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// FIXME: (for the record) Add "friend class Literal<zero_t>;" and a protected ctor.
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template
<
typename
T>
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operator
const
T ()
const
;
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};
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extern
const
zero_t
zero
;
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# ifndef MLN_INCLUDE_ONLY
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inline
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zero_t::zero_t()
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{
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}
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template
<
typename
T>
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inline
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zero_t::operator
const
T ()
const
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{
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mlc_converts_to(
int
, T)::check();
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return
0;
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}
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# ifndef MLN_WO_GLOBAL_VARS
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const
zero_t
zero
;
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# endif // !MLN_WO_GLOBAL_VARS
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# endif // ! MLN_INCLUDE_ONLY
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}
// end of namespace mln::literal
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}
// end of namespace mln
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#endif // ! MLN_LITERAL_ZERO_HH
mln
literal
zero.hh
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