mirror of
https://develop.openfoam.com/Development/openfoam.git
synced 2025-11-28 03:28:01 +00:00
d4eb17a9ff
- this is somewhat like labelRange, but with a stride.
Can be used to define slices (of lists, fields, ..) or as a range specifier
for a for-loop. For example,
for (label i : sliceRange(0, 10, 3))
{
...
}
209 lines
4.3 KiB
C++
209 lines
4.3 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) 2019 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 <algorithm>
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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inline constexpr Foam::sliceRange::sliceRange() noexcept
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:
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start_(0),
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size_(0),
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stride_(0)
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{}
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inline Foam::sliceRange::sliceRange
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(
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const label start,
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const label size,
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const label stride
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) noexcept
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:
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start_(start),
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size_(std::max(0,size)), // No negative size
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stride_(std::max(0,stride)) // No negative stride
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{}
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// * * * * * * * * * * * * * * * * Iterators * * * * * * * * * * * * * * * * //
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inline Foam::sliceRange::indexer::indexer
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(
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const sliceRange* range,
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const label i
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)
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:
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stride_(range->stride()),
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value_
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(
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range->start()
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+ ((i < 0 || i > range->size()) ? range->size() : i) * stride_
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)
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{}
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inline void Foam::sliceRange::indexer::next() noexcept
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{
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value_ += stride_;
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}
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inline void Foam::sliceRange::indexer::next(const label n) noexcept
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{
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value_ += (n * stride_);
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}
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inline bool Foam::sliceRange::indexer::equals
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(
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const indexer& other
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) const noexcept
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{
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return (value_ == other.value_);
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}
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inline Foam::label Foam::sliceRange::indexer::operator*() const noexcept
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{
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return value_;
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}
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inline Foam::label Foam::sliceRange::indexer::operator()()
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{
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const label old(value_);
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next();
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return old;
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}
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inline Foam::sliceRange::const_iterator::const_iterator
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(
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const sliceRange* range,
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const label i
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)
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:
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indexer(range, i)
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{}
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inline Foam::sliceRange::const_iterator&
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Foam::sliceRange::const_iterator::operator++() noexcept
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{
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next();
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return *this;
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}
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inline Foam::sliceRange::const_iterator&
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Foam::sliceRange::const_iterator::operator+=(const label n) noexcept
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{
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next(n);
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return *this;
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}
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inline Foam::sliceRange::const_iterator&
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Foam::sliceRange::const_iterator::operator--() noexcept
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{
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next(-1);
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return *this;
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}
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inline Foam::sliceRange::const_iterator&
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Foam::sliceRange::const_iterator::operator-=(const label n) noexcept
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{
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next(-n);
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return *this;
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}
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inline bool Foam::sliceRange::const_iterator::operator==
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(
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const const_iterator& iter
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) const noexcept
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{
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return equals(iter);
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}
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inline bool Foam::sliceRange::const_iterator::operator!=
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(
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const const_iterator& iter
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) const noexcept
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{
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return !equals(iter);
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}
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inline Foam::sliceRange::const_iterator Foam::sliceRange::begin() const
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{
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return const_iterator(this, 0);
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}
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inline Foam::sliceRange::const_iterator Foam::sliceRange::cbegin() const
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{
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return const_iterator(this, 0);
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}
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inline const Foam::sliceRange::const_iterator Foam::sliceRange::end() const
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{
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return const_iterator(this, -1);
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}
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inline const Foam::sliceRange::const_iterator Foam::sliceRange::cend() const
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{
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return const_iterator(this, -1);
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}
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inline Foam::sliceRange::indexer Foam::sliceRange::generator() const
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{
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return indexer(this, 0);
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}
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inline Foam::sliceRange::const_iterator
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Foam::sliceRange::at(const label i) const
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{
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return const_iterator(this, i);
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}
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// * * * * * * * * * * * * * * * Member Operators * * * * * * * * * * * * * //
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inline Foam::label Foam::sliceRange::operator[](const label i) const noexcept
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{
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return start_ + stride_ * i;
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}
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// ************************************************************************* //
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