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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
Foam::expression::Operate
Description
Class which provides the ability to access and evaluate an expression
element-by-element. This must be specialised for expressionable containers
in order for them to support field algebra.
\*---------------------------------------------------------------------------*/
#ifndef expressionOperate_H
#define expressionOperate_H
#include "expressionExpressionable.H"
#include "expressionBound.H"
#include "expressionBase.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace expression
{
/*---------------------------------------------------------------------------*\
Class Operate Declaration
\*---------------------------------------------------------------------------*/
template<class Expression, class = Arguments<>, class = void>
struct Operate;
template<class Expression, class ... Args>
struct Operate
<
Expression,
Arguments<Args ...>,
EnableIfNotExpressionable<Expression>
>
{
using type = const Expression&;
static type access(const Expression& e, const Args& ... args)
{
return e;
}
static bool compare(const Expression& e, const Args& ... args)
{
return false;
}
static void advance(const Expression& e, Args& ... args)
{}
};
/*---------------------------------------------------------------------------*\
Class OperateIterable Declaration
\*---------------------------------------------------------------------------*/
template<class Type, class = Arguments<>>
struct OperateIterable;
//- Define access by index
template<class Container>
struct OperateIterable<Container, Arguments<label>>
{
using type = const typename Container::value_type&;
static type access(const Container& f, const label i)
{
return f[i];
}
};
//- Define access to the start and end iterators
template<class Container, bool Index>
struct OperateIterable<Container, Arguments<Bound<Index>>>
{
using type = typename Container::const_iterator;
static type access(const Container& f, const Bound<false>&)
{
return f.begin();
}
static type access(const Container& f, const Bound<true>&)
{
return f.end();
}
};
//- Define access by dereferencing an iterator. Also define comparison and
// incrementation of iterators.
template<class Container, class ... Args>
struct OperateIterable
<
Container,
Arguments<typename Container::const_iterator, Args ...>
>
{
using type = const typename Container::value_type&;
static type access
(
const Container& f,
const typename Container::const_iterator& fi
)
{
return *fi;
}
static bool compare
(
const Container& f,
const typename Container::const_iterator& fi,
const typename Container::const_iterator& fj
)
{
return fi == fj;
}
static void advance
(
const Container& f,
typename Container::const_iterator& fi
)
{
++ fi;
}
};
//- Define access to the base as the container itself. An iterable container
// *is* typically the expressionable base class. It does not *have* an
// expressionable base class.
template<class Container>
struct OperateIterable<Container, Arguments<Base>>
{
using type = const Container&;
static type access(const Container& f, const Base&)
{
return f;
}
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
//- Access part of a given expression. E.g., given an index as an argument,
// return an element. Or given a type representing the start or end, return
// an iterator.
template<class Expression, class ... Args>
typename Operate<Expression, Arguments<Args ...>>::type
access(const Expression& e, const Args& ... args)
{
return Operate<Expression, Arguments<Args ...>>::access(e, args ...);
}
//- Compare parts of a given expression
template<class Expression, class ... Args>
bool compare(const Expression& e, const Args& ... args)
{
return Operate<Expression, Arguments<Args ...>>::compare(e, args ...);
}
//- Advance the parts of a given expression to the next element
template<class Expression, class ... Args>
void advance(const Expression& e, Args& ... args)
{
return Operate<Expression, Arguments<Args ...>>::advance(e, args ...);
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace expression
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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