From bed46a062c442656b1bc16d965e12405297029d3 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Tue, 31 Mar 2020 12:19:09 +0200
Subject: Remove redundant code

---
 cppbnf.cpp | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/cppbnf.cpp b/cppbnf.cpp
index 4f0b758..d5ffa12 100644
--- a/cppbnf.cpp
+++ b/cppbnf.cpp
@@ -21,30 +21,12 @@ namespace {
   return result;
  }
 
- std::unordered_map<std::string, std::unordered_set<std::string>> reverseBNF(const BNF& bnf)
- {
-  std::unordered_map<std::string, std::unordered_set<std::string>> result;
-  for (const auto& [symbol, lists] : bnf) {
-   for (const auto& list : lists) {
-    for (const auto& i : list) {
-     auto it = result.find(i);
-     if (it == result.end())
-      result.emplace(i, std::unordered_set<std::string>{symbol});
-     else
-      it->second.insert(symbol);
-    }
-   }
-  }
-
-  return result;
- }
-
  size_t numberOfStartSymbols(const BNF& bnf)
  {
   // exactly 1 start symbol
   std::vector<std::string> startSymbols;
 
-  auto reverse{ reverseBNF(bnf) };
+  auto reverse{ Reverse(bnf) };
 
   for (const auto& [symbol, lists] : bnf) {
    if (reverse.find(symbol) == reverse.end())
-- 
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