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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/>.
\*---------------------------------------------------------------------------*/
#include "expressions.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace expression
{
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
//- A pointPatchField is expressionable (yes, really ...)
template<class Type>
struct Expressionable<pointPatchField<Type>>
:
public std::integral_constant<signed char, 1>
{};
//- Define access to a pointPatchField as returning a Field, but do not
// actually provide an implementation. This just facilitates generation of the
// identity value for reduction.
template<class Type>
struct Operate<pointPatchField<Type>, Arguments<Base>>
{
using type = const Field<Type>&;
static type access(const pointPatchField<Type>& f, const Base&)
{
return static_cast<type>(f.primitiveField());
}
};
//- Define the types returned by pointPatchField expressions
template<class Type>
struct Result<pointPatchField<Type>>
{
template<class Expression>
using operateType =
typename Operate<std::decay_t<Expression>, Arguments<>>::type;
template<class Expression>
using elementType =
typename Result
<
Field<Type>
>::template elementType<operateType<Expression>>;
template<class Expression>
using type = nil;
};
//- Define reduction of a pointPatchField as returning the identity for the
// given operation
template<class Type>
struct Reduce<pointPatchField<Type>>
{
template<class Op, class Expression>
static typename Result
<
pointPatchField<Type>
>::template elementType<Expression> value(const Expression& e)
{
return
Op::template identity
<
typename Result
<
pointPatchField<Type>
>::template elementType<Expression>
>();
}
};
//- Implement selection of a pointPatchField within an expression. Construct a
// calculated field type on non-constrained patch types, and pass through a
// reference to the internal field if this was provided.
template<class Type>
struct Select
<
pointPatchField<Type>,
true,
EnableIfExpressionable<pointPatchField<Type>>
>
{
using type = autoPtr<pointPatchField<Type>>;
template<class Expression>
static type New
(
const Expression& e,
const DimensionedField<Type, pointMesh, Field>& iF
)
{
autoPtr<pointPatchField<Type>> tResult =
pointPatchField<Type>::New
(
pointPatchField<Type>::calculatedType(),
getFirst<Patch<pointPatch>>(e),
iF
);
tResult() = e;
return tResult;
}
template<class Expression>
static type New(const Expression& e)
{
return
New
(
e,
NullObjectRef<DimensionedField<Type, pointMesh, Field>>()
);
}
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace expression
} // End namespace Foam
// ************************************************************************* //
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