NBT: Bool operator

src/nbt/NBT.cpp

@@ -137,6 +137,11 @@ namespace NBT
         return nbt_dump_ascii(m_node);
     }
 
+    Tag::operator bool() const
+    {
+        return m_node != NULL && m_node->type != TAG_INVALID;
+    }
+
     std::ostream& operator<<(std::ostream& stream, const Tag& tag)
     {
         return stream << tag.ToString();

src/nbt/NBT.h

@@ -45,6 +45,8 @@ namespace NBT
         const DataBuffer GetData() const;
 
         const char* ToString() const;
+
+        operator bool() const;
     };
 
     // Operator overload for ostream