161 lines
5.9 KiB
C++
161 lines
5.9 KiB
C++
/* ========================================================================= *
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* *
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* OpenMesh *
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* Copyright (c) 2001-2015, RWTH-Aachen University *
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* Department of Computer Graphics and Multimedia *
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* All rights reserved. *
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* www.openmesh.org *
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* *
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*---------------------------------------------------------------------------*
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* This file is part of OpenMesh. *
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*---------------------------------------------------------------------------*
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* *
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* Redistribution and use in source and binary forms, with or without *
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* modification, are permitted provided that the following conditions *
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* are met: *
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* *
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* 1. Redistributions of source code must retain the above copyright notice, *
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* this list of conditions and the following disclaimer. *
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* *
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* 2. Redistributions in binary form must reproduce the above copyright *
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* notice, this list of conditions and the following disclaimer in the *
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* documentation and/or other materials provided with the distribution. *
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* *
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* 3. Neither the name of the copyright holder nor the names of its *
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* contributors may be used to endorse or promote products derived from *
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* this software without specific prior written permission. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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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> TrueType;
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/// Handy typedef for Bool2Type<false> classes
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typedef Bool2Type<false> FalseType;
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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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