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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/>.
Namespace
Foam
Description
A function which evaluates an expression into a temporary field. Note that
this is in the top-level namespace, not the expression sub-namespace. This
is because this is designed to be used in high-level code, so it is
desirable to avoid the clutter associated with the sub-namespace.
\*---------------------------------------------------------------------------*/
#ifndef expressionEval_H
#define expressionEval_H
#include "expressionContainers.H"
#include "expressionResult.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
//- Base class for conditional expression evaluation
template<class Expression, class = void>
struct Eval;
//- If the argument is not an expression return it
template<class Expression>
struct Eval<Expression, EnableIfNotExpression<Expression>>
{
static const Expression& eval(const Expression& e)
{
return e;
}
};
//- If the argument is an expression evaluate it and return the result
template<class Expression>
struct Eval<Expression, EnableIfExpression<Expression>>
{
static tmp<ResultType<Expression>> eval(const Expression& e)
{
return tmp<ResultType<Expression>>(new ResultType<Expression>(e));
}
};
//- If the argument is an expression evaluate it and return the tmp<result>
// otherwise return it
template<class Expression, class = EnableIfExpressionable<Expression>>
tmp<ResultType<Expression>> eval(const Expression& e)
{
return Eval<Expression>::eval(e);
}
//- Evaluate an expression and write to Ostream
template<class Expression, class = EnableIfExpression<Expression>>
Ostream& operator<<(Ostream& os, const Expression& e)
{
os << eval(e);
return os;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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