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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::Select
Description
Simple wrapper that modifies expression access so that it constructs and
returns a (tmp) container of a given type, rather than producing a
sub-expression. Used to construct from expressions, rather than just to
assign to them. This will need overloading if the type in question doesn't
have a basic construct-from-expression constructor, and/or if the type is
abstract and some sort of default selection is needed.
\*---------------------------------------------------------------------------*/
#ifndef expressionSelect_H
#define expressionSelect_H
#include "expressionExpressionable.H"
#include "autoPtr.H"
#include "tmp.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace expression
{
/*---------------------------------------------------------------------------*\
Class Select Declaration
\*---------------------------------------------------------------------------*/
template<class Type, const bool Ptr, class = void>
struct Select;
template<class Type, bool Ptr>
struct Select<Type, Ptr, EnableIfExpressionable<Type>>
{
using type = tmp<Type>;
template<class Expression>
static tmp<Type> New(const Expression& e)
{
return tmp<Type>(new Type(e));
}
};
template<class Type>
struct Select<Type, true, EnableIfNotExpressionable<Type>>
{
using type = autoPtr<Type>;
template<class Expression>
static type New(const Expression& e)
{
return autoPtr<Type>(new Type(e));
}
};
template<class Type>
struct Select<Type, false, EnableIfNotExpressionable<Type>>
{
using type = Type;
template<class Expression>
static type New(const Expression& e)
{
return Type(e);
}
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
//- Return a new object constructed from the result of an expression access
template<class Type, const bool Ptr, class Expression, class ... Args>
typename Select<Type, Ptr>::type New(const Expression& e, const Args& ... args)
{
return Select<Type, Ptr>::template New<Expression>(e, args ...);
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace expression
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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