refactor out uuidgenerator

src/fragment_store/uuid_generator.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <vector>
+#include <array>
+#include <random>
+#include <cstdint>
+
+struct UUIDGeneratorI {
+	virtual std::vector<uint8_t> operator()(void) = 0;
+};
+
+struct UUIDGenerator_128_128 final : public UUIDGeneratorI {
+	private:
+		std::array<uint8_t, 16> _uuid_namespace;
+		std::minstd_rand _rng{std::random_device{}()};
+
+	public:
+		UUIDGenerator_128_128(void); // default randomly initializes namespace
+		UUIDGenerator_128_128(const std::array<uint8_t, 16>& uuid_namespace);
+
+		std::vector<uint8_t> operator()(void) override;
+};
+