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view interps/rail/src/NilVar.h @ 3968:e82654a7f372
<ais523\unfoog> addquote <kmc> Sgeo: oh yeah those animated characters were built into the operating system and there was an API for them
author | HackBot |
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date | Fri, 01 Nov 2013 03:30:15 +0000 |
parents | 859f9b4339e6 |
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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