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view interps/rail/src/NilVar.h @ 3251:72e50bb3171f
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author | HackBot |
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date | Sun, 30 Jun 2013 01:59:02 +0000 |
parents | 859f9b4339e6 |
children |
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// NilVar.h #ifndef NIL_VAR_H_RAIL_1 #define NIL_VAR_H_RAIL_1 #include "Var.h" class NilVar : public Var { public: NilVar() {} virtual ~NilVar() {} virtual StringVar * getString(void) { return NULL; } virtual ListVar * getList(void) { return NULL; } virtual NilVar * getNil(void) { return this; } virtual Closure * getClosure(void) { return NULL; } virtual std::string toString(void) const { return "<NIL>"; } private: NilVar(NilVar const &) {} NilVar & operator=(NilVar const &) { return *this; } }; #endif