Geant4  10.00.p02
CompileTimeConstraints.hh
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 #ifndef CompileTimeConstraints_hh
27 #define CompileTimeConstraints_hh
28 
30 {
31  template <class Base> char InheritsFrom(Base *);
32  template <class Derived> Derived* DerivedPointer();
33  template < class A, class B > struct IsA
34  {
35  public:
36  enum { ok=(sizeof(InheritsFrom<B>(DerivedPointer<A>())) ) };
37  };
38 }
39 
40 #endif
char InheritsFrom(Base *)
Derived * DerivedPointer()