c65e2e580d
- some functionality similar to what the standary library <iterator>
provides.
* stdFoam::begin() and stdFoam::end() do type deduction,
which means that many cases it is possible to manage these types
of changes.
For example, when managing a number of indices:
Map<labelHashSet> lookup;
1) Longhand:
for
(
Map<labelHashSet>::const_iterator iter = lookup.begin();
iter != lookup.end();
++iter
)
{ .... }
1b) The same, but wrapped via a macro:
forAllConstIter(Map<labelHashSet>, lookup, iter)
{ .... }
2) Using stdFoam begin/end templates directly
for
(
auto iter = stdFoam::begin(lookup);
iter != stdFoam::end(lookup);
++iter
)
{ .... }
2b) The same, but wrapped via a macro:
forAllConstIters(lookup, iter)
{ .... }
Note that in many cases it is possible to simply use a range-based for.
Eg,
labelList myList;
for (auto val : myList)
{ ... }
for (const auto& val : myList)
{ ... }
These however will not work with any of the OpenFOAM hash-tables,
since the standard C++ concept of an iterator would return a key,value
pair when deferencing the *iter.
The deduction methods also exhibits some slightly odd behaviour with
some PtrLists (needs some more investigation).
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*---------------------------------------------------------------------------*\
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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) 2011 OpenFOAM Foundation
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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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Application
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Description
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\*---------------------------------------------------------------------------*/
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#include "OSspecific.H"
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#include "IOstreams.H"
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#include "ISLList.H"
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using namespace Foam;
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class Scalar
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:
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public ISLList<Scalar>::link
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{
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public:
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scalar data_;
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Scalar()
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:
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data_(0)
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{}
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Scalar(scalar s)
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:
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data_(s)
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{}
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friend Ostream& operator<<(Ostream& os, const Scalar& s)
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{
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os << s.data_;
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return os;
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}
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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// Main program:
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int main(int argc, char *argv[])
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{
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ISLList<Scalar> myList;
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for (int i = 0; i<10; i++)
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{
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myList.append(new Scalar(1.3*i));
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}
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myList.append(new Scalar(100.3));
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myList.append(new Scalar(500.3));
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Info<< nl << "And again using STL iterator: " << nl << endl;
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forAllIters(myList, iter)
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{
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Info<< "element:" << *iter << endl;
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}
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Info<< nl << "And again using STL const_iterator: " << nl << endl;
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const ISLList<Scalar>& const_myList = myList;
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forAllConstIters(const_myList, iter)
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{
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Info<< "element:" << *iter << endl;
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}
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Info<< nl << "Testing transfer: " << nl << endl;
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Info<< "original: " << myList << endl;
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ISLList<Scalar> newList;
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newList.transfer(myList);
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Info<< nl << "source: " << myList << nl
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<< nl << "target: " << newList << endl;
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Info<< nl << "Bye." << endl;
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return 0;
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}
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// ************************************************************************* //
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