Gabriele Cosmo
146 lines
4.7 KiB
C++
146 lines
4.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// Author: Mathieu Karamitros
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/*
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* Compile time counter to use flags with switch and add new flags
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*
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* - Usage 1
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*
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* class A {
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* G4CT_COUNT_INIT(0)
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* CT_COUNT(a)
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* CT_COUNT(b)
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* CT_COUNT(c)
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* };
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*
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* class B1 : public A{
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* CT_COUNT(d)
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* };
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*
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* class B2 : public A{
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* CT_COUNT(e)
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* };
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* class C : public B1{
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* CT_COUNT(f)
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* };
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*
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* Result
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* a = 0
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* b = 1
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* c = 2
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* d & e = 3
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* f = 4
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*
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* - Usage 2
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* namespace CounterNSpace{
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* G4CT_COUNT_INIT(0)
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* CT_COUNT(a)
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* CT_COUNT(b)
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* CT_COUNT(c)
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* }
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*
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* // extend
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* namespace CounterNSpace{
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* CT_COUNT(d)
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* CT_COUNT(e)
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* CT_COUNT(f)
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* }
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*/
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#ifndef G4CTCounter_h
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#define G4CTCounter_h
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template<int N>
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struct G4Number: public G4Number<N-1>{
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static constexpr int value=N;
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};
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template<>
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struct G4Number<0>{
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static constexpr int value=0;
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};
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//------------------------------------------------------------------------------
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#define G4CT_COUNT_INIT(init_value) \
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static constexpr G4Number<init_value> \
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Counter(G4Number<init_value>) { \
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return G4Number<init_value>(); \
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}
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// Allow overridable maximum enum depth by setting G4CT_MAX_COUNT
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#ifndef G4CT_MAX_COUNT
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#ifndef __NVCOMPILER
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// Maximum in Geant4 V11.0.0 is hardcoded to 255
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#define G4CT_MAX_COUNT 255
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#else
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// NVC++ compiler default template instantiation recursion limit is 64.
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// This can be changed by setting, e.g., "-Wc,--pending_instantiations=256"
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#define G4CT_MAX_COUNT 63
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#endif
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#endif
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#define G4CT_COUNT(flagName) \
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static constexpr const int flagName = decltype(Counter(G4Number<G4CT_MAX_COUNT>{}))::value; \
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static constexpr G4Number<flagName + 1> Counter(G4Number<flagName + 1>) \
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{ \
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static_assert(flagName + 1 < G4CT_MAX_COUNT, "Maximum enumeration count exeeded"); \
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return G4Number<flagName + 1>{}; \
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}
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//------------------------------------------------------------------------------
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// On Win platforms, static functions must not be inlined, use the following
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// macros to separate definition and implementation of static function
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// to avoid potential crashes
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#define G4CT_COUNT_INIT_DEF(init_value) \
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static constexpr G4Number<init_value> \
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Counter(G4Number<init_value>);
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#define G4CT_COUNT_INIT_IMPL(enumName, init_value) \
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constexpr G4Number<init_value> \
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enumName::Counter(G4Number<init_value>){ \
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return G4Number<init_value>{}; \
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}
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#define G4CT_COUNT_DEF(flagName) \
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static constexpr const int flagName = \
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decltype(Counter(G4Number<G4CT_MAX_COUNT>{}))::value; \
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static constexpr G4Number<flagName + 1> \
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Counter(G4Number<flagName + 1>);
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#define G4CT_COUNT_IMPL(enumName, flagName) \
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constexpr G4Number<enumName::flagName + 1> \
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enumName::Counter(G4Number<enumName::flagName + 1>){ \
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return G4Number<enumName::flagName +1 >{}; \
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}
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//------------------------------------------------------------------------------
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#endif
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