gitignore modefied

https://github.com/moneroexamples/onion-monero-blockchain-explorer/pull/45

ext/vpetrigocaches/fifo_cache_policy.hpp

@@ -0,0 +1,53 @@
+#ifndef FIFO_CACHE_POLICY_HPP
+#define FIFO_CACHE_POLICY_HPP
+
+#include <list>
+#include "cache_policy.hpp"
+
+namespace caches
+{
+
+template <typename Key>
+class FIFOCachePolicy : public ICachePolicy<Key>
+{
+ public:
+
+  FIFOCachePolicy() = default;
+  ~FIFOCachePolicy() = default;
+
+  void Insert(const Key& key) override
+  {
+    fifo_queue.emplace_front(key);
+  }
+
+  // handle request to the key-element in a cache
+  void Touch(const Key& key) override
+  {
+    // nothing to do here in the FIFO strategy
+  }
+
+  // handle element deletion from a cache
+  void Erase(const Key& key) override
+  {
+    fifo_queue.pop_back();
+  }
+
+  // return a key of a replacement candidate
+  const Key& ReplCandidate() const override
+  {
+    return fifo_queue.back();
+  }
+
+  // return a key of a displacement candidate
+  void Clear() override
+  {
+    fifo_queue.clear();
+  }
+
+private:
+
+  std::list<Key> fifo_queue;
+};
+} // namespace caches
+
+#endif // FIFO_CACHE_POLICY_HPP