CompileTimeConstraints.hh

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00025 //
00026 #ifndef CompileTimeConstraints_hh
00027 #define CompileTimeConstraints_hh
00028 
00029 namespace CompileTimeConstraints
00030 {
00031   template <class Base> char InheritsFrom(Base *);
00032   template <class Derived> Derived* DerivedPointer();
00033   template < class A, class B > struct IsA 
00034   { 
00035   public:
00036     enum { ok=(sizeof(InheritsFrom<B>(DerivedPointer<A>())) ) };
00037   };
00038 }
00039 
00040 #endif

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