rename #1

src/messages/_LimitedQueueSnapshot.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <cassert>
+#include <memory>
+#include <vector>
+
+namespace chatterino {
+namespace messages {
+
+template <typename T>
+class LimitedQueueSnapshot
+{
+public:
+    LimitedQueueSnapshot() = default;
+
+    LimitedQueueSnapshot(std::shared_ptr<std::vector<std::shared_ptr<std::vector<T>>>> _chunks,
+                         size_t _length, size_t _firstChunkOffset, size_t _lastChunkEnd)
+        : chunks(_chunks)
+        , length(_length)
+        , firstChunkOffset(_firstChunkOffset)
+        , lastChunkEnd(_lastChunkEnd)
+    {
+    }
+
+    std::size_t getLength()
+    {
+        return this->length;
+    }
+
+    T const &operator[](std::size_t index) const
+    {
+        index += this->firstChunkOffset;
+
+        size_t x = 0;
+
+        for (size_t i = 0; i < this->chunks->size(); i++) {
+            auto &chunk = this->chunks->at(i);
+
+            if (x <= index && x + chunk->size() > index) {
+                return chunk->at(index - x);
+            }
+            x += chunk->size();
+        }
+
+        assert(false && "out of range");
+
+        return this->chunks->at(0)->at(0);
+    }
+
+private:
+    std::shared_ptr<std::vector<std::shared_ptr<std::vector<T>>>> chunks;
+
+    size_t length = 0;
+    size_t firstChunkOffset = 0;
+    size_t lastChunkEnd = 0;
+};
+
+}  // namespace messages
+}  // namespace chatterino