From 75648d51a184fa2936f62fbb82ba399c0b83d7d0 Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Fri, 19 Aug 2016 22:54:35 +0800
Subject: Common - Useful helper for some of the typecheck changes

---
 src/common.hpp | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/common.hpp b/src/common.hpp
index 7f7dbcb7..bea299bf 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -133,11 +133,34 @@ struct LList
     const LList*  m_prev;
     T   m_item;
     
+    LList():
+        m_prev(nullptr)
+    {}
     LList(const LList* prev, T item):
         m_prev(prev),
         m_item( ::std::move(item) )
     {
-    };
+    }
+    
+    LList end() const {
+        return LList();
+    }
+    LList begin() const {
+        return *this;
+    }
+    bool operator==(const LList& x) {
+        return m_prev == x.m_prev;
+    }
+    bool operator!=(const LList& x) {
+        return m_prev != x.m_prev;
+    }
+    void operator++() {
+        assert(m_prev);
+        *this = *m_prev;
+    }
+    const T& operator*() const {
+        return m_item;
+    }
 };
 
 template<typename T>
-- 
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