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fun/v2v/saturate.hh
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// Copyright (C) 2007, 2009, 2010 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_FUN_V2V_SATURATE_HH
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# define MLN_FUN_V2V_SATURATE_HH
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# include <mln/core/concept/function.hh>
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# include <mln/metal/converts_to.hh>
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# include <mln/trait/value_.hh>
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# include <mln/value/cast.hh>
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# include <mln/convert/from_to.hh>
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namespace
mln
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{
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namespace
fun
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{
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namespace
v2v
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{
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// FIXME: Doc!
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template
<
typename
V>
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struct
saturate
:
public
Function_v2v
< saturate<V> >
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{
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saturate
();
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saturate
(
const
V&
min
,
const
V&
max
);
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typedef
V
result
;
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template
<
typename
W>
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V
operator()
(
const
W& w)
const
;
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protected
:
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V
min_
,
max_
;
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mutable
bool
needs_update_
;
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};
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# ifndef MLN_INCLUDE_ONLY
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template
<
typename
V>
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inline
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saturate<V>::saturate
()
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: min_(mln_min(V)),
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max_(mln_max(V))
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{
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needs_update_
=
true
;
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}
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template
<
typename
V>
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inline
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saturate<V>::saturate
(
const
V&
min
,
const
V&
max
)
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: min_(min),
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max_(max)
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{
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mln_precondition(max > min);
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needs_update_
=
true
;
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}
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template
<
typename
V>
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template
<
typename
W>
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inline
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V
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saturate<V>::operator()
(
const
W& w)
const
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{
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// FIXME: Check that W is a larger type than V; otherwise
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// alt code.
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static
W min_W, max_W;
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if
(needs_update_)
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{
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min_W = mln::value::cast<W>(min_);
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max_W = mln::value::cast<W>(max_);
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needs_update_ =
false
;
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}
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// FIXME: Below we need something more powerful that mlc_converts_to
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// for instance, with W=int_s<10u> and V=int_u<8u>, it does not
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// works cause the cast is not obvious...
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// mlc_converts_to(W, V)::check();
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if
(w < min_W)
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return
min_;
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if
(w > max_W)
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return
max_;
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V output;
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mln::convert::from_to
(w, output);
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return
output;
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}
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# endif // ! MLN_INCLUDE_ONLY
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}
// end of namespace mln::fun::v2v
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}
// end of namespace mln::fun
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}
// end of namespace mln
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#endif // ! MLN_FUN_V2V_SATURATE_HH
mln
fun
v2v
saturate.hh
Copyright (C) 2012 EPITA Research and Development Laboratory (LRDE)