| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / 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. | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| 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 | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |