add util::Buffer template

src/util/Buffer.hpp

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <memory>
+#include <cstring>
+
+namespace util {
+    template<typename T>
+    class Buffer {
+        std::unique_ptr<T[]> ptr;
+        size_t length;
+    public:
+        Buffer(size_t length)
+         : ptr(std::make_unique<T[]>(length)), length(length) {
+        }
+
+        Buffer(std::unique_ptr<T[]> ptr, size_t length)
+         : ptr(std::move(ptr)), length(length) {}
+
+        Buffer(const T* src, size_t length)
+         : ptr(std::make_unique<T[]>(length)), length(length) {
+            std::memcpy(ptr.get(), src, length);
+        }
+
+        T& operator[](long long index) {
+            return ptr[index];
+        }
+
+        const T& operator[](long long index) const {
+            return ptr[index];
+        }
+
+        T* data() {
+            return ptr.get();
+        }
+
+        const T* data() const {
+            return ptr.get();
+        }
+
+        size_t size() const {
+            return length;
+        }
+
+        std::unique_ptr<T[]> release() {
+            return std::move(ptr);
+        }
+
+        Buffer clone() const {
+            return Buffer(ptr.get(), length);
+        }
+    };
+}