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view interps/rail/src/NilVar.h @ 12268:6bbbe2a95120 draft
<b_jonas> slashlearn euclid//Euclid is a short geeky game in which the goal is to do Euclidean compass and straightedge constructions in as few steps as possible. It runs in the browser, found at "http://www.euclidthegame.com/". It was popular among #esoteric regulars in 2016-07.
author | HackEso <hackeso@esolangs.org> |
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date | Mon, 16 Dec 2019 23:02:52 +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