add missing files

randomgen.cpp

+#include "randomgen.h"
+#include <assert.h>
+#include <cstddef>
+#include <cstdint>
+#include <random>
+
+static std::default_random_engine randomEngine;
+static std::uniform_real_distribution<double> dist(0, 1);
+static std::uniform_int_distribution<size_t> distSt(0, SIZE_MAX);
+
+double rd::rand(double max)
+{
+	return dist(randomEngine)*max;
+}
+
+size_t rd::uid()
+{
+	return distSt(randomEngine);
+}
+
+void rd::init()
+{
+	std::random_device randomDevice;
+	randomEngine.seed(randomDevice());
+}

randomgen.h

+#pragma once
+
+#include <cstddef>
+
+namespace rd
+{
+
+double rand(double max = 1);
+void init();
+size_t uid();
+
+}