From e3b6538c17884b5985a78e3d7c507d02b7af2e78 Mon Sep 17 00:00:00 2001
From: dec05eba <0xdec05eba@gmail.com>
Date: Tue, 8 May 2018 17:53:10 +0200
Subject: Add more comparison functions to hash

---
 include/odhtdb/Hash.hpp |  3 +++
 src/Hash.cpp            | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/odhtdb/Hash.hpp b/include/odhtdb/Hash.hpp
index c1212ec..05e85d2 100644
--- a/include/odhtdb/Hash.hpp
+++ b/include/odhtdb/Hash.hpp
@@ -38,6 +38,9 @@ namespace odhtdb
         
         size_t operator()() const;
         bool operator==(const Hash &other) const;
+        bool operator!=(const Hash &other) const;
+        
+        bool isEmpty() const;
         
         std::string toString() const;
     private:
diff --git a/src/Hash.cpp b/src/Hash.cpp
index 364cddd..4b045a4 100644
--- a/src/Hash.cpp
+++ b/src/Hash.cpp
@@ -17,6 +17,8 @@ namespace odhtdb
     
     static SodiumInitializer __sodiumInitializer;
     
+    static const Hash EMPTY_HASH;
+    
     Hash::Hash()
     {
         memset(data, 0, HASH_BYTE_SIZE);
@@ -44,8 +46,18 @@ namespace odhtdb
         return memcmp(data, other.data, HASH_BYTE_SIZE) == 0;
     }
     
+    bool Hash::operator!=(const Hash &other) const
+    {
+        return !operator==(other);
+    }
+    
     std::string Hash::toString() const
     {
         return bin2hex(data, HASH_BYTE_SIZE);
     }
+    
+    bool Hash::isEmpty() const
+    {
+        return *this == EMPTY_HASH;
+    }
 }
-- 
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