From 8feccee75dadbf970b2fb402a8c624ed9b25f041 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 10 Apr 2015 03:04:22 +0200
Subject: generator_slr: implement first and follow set generation

---
 src/symbol.hpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/symbol.hpp')

diff --git a/src/symbol.hpp b/src/symbol.hpp
index 0e79eb6..e468d37 100644
--- a/src/symbol.hpp
+++ b/src/symbol.hpp
@@ -49,6 +49,7 @@ struct symbol_t : public std::tuple<symbol_type_t, std::string>  {
 		return std::get<1>(*this);
 	}
 
+
 	static symbol_t make_nonterm(const std::string &value) {
 		return symbol_t(SYMBOL_TYPE_NONTERM, value);
 	}
@@ -61,6 +62,10 @@ struct symbol_t : public std::tuple<symbol_type_t, std::string>  {
 		char v[2] = {char(value), 0};
 		return symbol_t(SYMBOL_TYPE_CHAR, v);
 	}
+
+	static symbol_t empty() {
+		return make_term("");
+	}
 };
 
 }
-- 
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