88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::StaticAssertionFailed
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Description
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Macros and classes to provide static (compile-time) assertions.
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Ideas from various sources
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(http://www.ddj.com/cpp/184401547, http://www.boost.org)
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\*---------------------------------------------------------------------------*/
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#ifndef StaticAssert_H
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#define StaticAssert_H
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namespace Foam
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{
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//- Forward declaration of StaticAssertionFailed.
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// Leave as an incomplete class so that sizeof(..) fails
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template<bool Truth> class StaticAssertionFailed;
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/*---------------------------------------------------------------------------*\
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Class StaticAssertionFailed Declaration
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\*---------------------------------------------------------------------------*/
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//- Specialization for successful assertions
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template<>
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class StaticAssertionFailed<true>
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{};
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//- Helper class for handling static assertions
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template<unsigned Test>
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class StaticAssertionTest {};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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// Paste together strings, even if an argument is itself a macro
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#define StaticAssertMacro(X,Y) StaticAssertMacro1(X,Y)
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#define StaticAssertMacro1(X,Y) StaticAssertMacro2(X,Y)
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#define StaticAssertMacro2(X,Y) X##Y
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#ifdef __GNUC__
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#define StaticAssertUnusedTypedef __attribute__((unused))
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#else
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#define StaticAssertUnusedTypedef
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#endif
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//- Assert that some test is true at compile-time
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#define StaticAssert(Test) \
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typedef ::Foam::StaticAssertionTest \
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< \
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sizeof( ::Foam::StaticAssertionFailed<((Test) ? true : false)>) \
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> StaticAssertMacro(StaticAssertionTest, __LINE__) StaticAssertUnusedTypedef
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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