random number generator to aid in generating random test cases

lib_random.h

@@ -0,0 +1,52 @@
+#ifndef RADII_LIB_RANDOM
+#define RADII_LIB_RANDOM
+
+#include <limits>
+#include <random>
+
+template <typename T = unsigned long> class random_number_generator {
+  std::random_device seed;
+  std::mt19937_64 generator;
+  std::uniform_int_distribution<T> range;
+  T l = std::numeric_limits<T>::min();
+  T h = std::numeric_limits<T>::max();
+
+public:
+  random_number_generator(T high = std::numeric_limits<T>::max());
+  random_number_generator(T low, T high);
+  T operator()();
+  T operator()(T h);
+  T operator()(T l, T h);
+};
+
+template <typename T>
+random_number_generator<T>::random_number_generator(T high) : h(high) {
+  generator.seed(seed());
+  range = std::uniform_int_distribution<T>(l, h);
+}
+
+template <typename T>
+random_number_generator<T>::random_number_generator(T low, T high)
+    : l(low), h(high) {
+  generator.seed(seed());
+  range = std::uniform_int_distribution<T>(l, h);
+}
+
+template <typename T> T random_number_generator<T>::operator()() {
+  return range(generator);
+}
+
+template <typename T> T random_number_generator<T>::operator()(T high) {
+  h = high;
+  range = std::uniform_int_distribution<T>(l, h);
+  return range(generator);
+}
+
+template <typename T> T random_number_generator<T>::operator()(T low, T high) {
+  l = low;
+  h = high;
+  range = std::uniform_int_distribution<T>(l, h);
+  return range(generator);
+}
+
+#endif