3996aade01
git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@83 fdac6126-5c0c-442c-9429-916003d36597
148 lines
4.9 KiB
C++
148 lines
4.9 KiB
C++
//=============================================================================
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//
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// OpenMesh
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// Copyright (C) 2003 by Computer Graphics Group, RWTH Aachen
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// www.openmesh.org
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//
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//-----------------------------------------------------------------------------
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//
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// License
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, version 2.1.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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//-----------------------------------------------------------------------------
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//
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// $Revision$
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// $Date$
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//
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//=============================================================================
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//=============================================================================
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//
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// Utils for generic/generative programming
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//
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//=============================================================================
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#ifndef OPENMESH_GENPROG_HH
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#define OPENMESH_GENPROG_HH
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//== INCLUDES =================================================================
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#include <OpenMesh/Core/System/config.h>
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//== NAMESPACES ===============================================================
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namespace OpenMesh {
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namespace GenProg {
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#ifndef DOXY_IGNORE_THIS
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//== IMPLEMENTATION ===========================================================
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/// This type maps \c true or \c false to different types.
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template <bool b> struct Bool2Type { enum { my_bool = b }; };
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/// This class generates different types from different \c int 's.
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template <int i> struct Int2Type { enum { my_int = i }; };
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/// Handy typedef for Bool2Type<true> classes
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typedef Bool2Type<true> True;
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/// Handy typedef for Bool2Type<false> classes
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typedef Bool2Type<false> False;
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//-----------------------------------------------------------------------------
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/// compile time assertions
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template <bool Expr> struct AssertCompile;
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template <> struct AssertCompile<true> {};
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//--- Template "if" w/ partial specialization ---------------------------------
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#if OM_PARTIAL_SPECIALIZATION
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template <bool condition, class Then, class Else>
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struct IF { typedef Then Result; };
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/** Template \c IF w/ partial specialization
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\code
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typedef IF<bool, Then, Else>::Result ResultType;
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\endcode
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*/
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template <class Then, class Else>
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struct IF<false, Then, Else> { typedef Else Result; };
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//--- Template "if" w/o partial specialization --------------------------------
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#else
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struct SelectThen
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{
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template <class Then, class Else> struct Select {
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typedef Then Result;
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};
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};
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struct SelectElse
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{
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template <class Then, class Else> struct Select {
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typedef Else Result;
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};
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};
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template <bool condition> struct ChooseSelector {
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typedef SelectThen Result;
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};
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template <> struct ChooseSelector<false> {
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typedef SelectElse Result;
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};
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/** Template \c IF w/o partial specialization. Use it like
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\code
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typedef IF<bool, Then, Else>::Result ResultType;
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\endcode
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*/
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template <bool condition, class Then, class Else>
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class IF
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{
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typedef typename ChooseSelector<condition>::Result Selector;
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public:
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typedef typename Selector::template Select<Then, Else>::Result Result;
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};
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#endif
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//=============================================================================
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#endif
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} // namespace GenProg
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} // namespace OpenMesh
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#define assert_compile(EXPR) GenProg::AssertCompile<(EXPR)>();
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//=============================================================================
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#endif // OPENMESH_GENPROG_HH defined
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//=============================================================================
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