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ListOps
ListOps.C
Go to the documentation of this file.
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/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include <
OpenFOAM/ListOps.H
>
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// * * * * * * * * * * * * * * * Global Functions * * * * * * * * * * * * * //
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Foam::labelList
Foam::invert
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(
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const
label len,
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const
UList<label>
& map
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)
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{
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labelList
inverse(len, -1);
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forAll
(map, i)
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{
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label newPos = map[i];
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if
(newPos >= 0)
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{
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if
(inverse[newPos] >= 0)
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{
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FatalErrorIn
(
"invert(const label, const UList<label>&)"
)
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<<
"Map is not one-to-one. At index "
<< i
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<<
" element "
<< newPos <<
" has already occurred before"
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<<
nl
<<
"Please use invertOneToMany instead"
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<<
abort
(
FatalError
);
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}
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inverse[newPos] = i;
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}
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}
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return
inverse;
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}
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Foam::labelListList
Foam::invertOneToMany
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(
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const
label len,
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const
UList<label>
& map
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)
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{
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labelList
nElems(len, 0);
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forAll
(map, i)
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{
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if
(map[i] >= 0)
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{
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nElems[map[i]]++;
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}
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}
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labelListList
inverse(len);
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forAll
(nElems, i)
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{
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inverse[i].
setSize
(nElems[i]);
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nElems[i] = 0;
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}
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forAll
(map, i)
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{
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label newI = map[i];
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if
(newI >= 0)
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{
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inverse[newI][nElems[newI]++] = i;
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}
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}
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return
inverse;
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}
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Foam::labelList
Foam::identity
(
const
label len)
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{
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labelList
map(len);
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forAll
(map, i)
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{
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map[i] = i;
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}
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return
map;
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}
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// ************************ vim: set sw=4 sts=4 et: ************************ //