1 files changed, 60 insertions, 0 deletions
diff --git a/core/math/randomizer.hh b/core/math/randomizer.hh
new file mode 100644
index 0000000..206af42
--- /dev/null
+++ b/core/math/randomizer.hh
@@ -0,0 +1,60 @@
+#ifndef CORE_MATH_RANDOMIZER_HH
+#define CORE_MATH_RANDOMIZER_HH 1
+#pragma once
+
+namespace math
+{
+template<typename T>
+class Randomizer final {
+public:
+    explicit Randomizer(void);
+    explicit Randomizer(std::uint64_t seed);
+    virtual ~Randomizer(void) = default;
+    void add(const T& value);
+    const T& get(void);
+    void clear(void);
+
+private:
+    std::vector<T> m_vector;
+    std::mt19937_64 m_twister;
+    std::uniform_int_distribution<std::size_t> m_dist;
+};
+} // namespace math
+
+template<typename T>
+inline math::Randomizer<T>::Randomizer(void)
+{
+    m_vector.clear();
+    m_twister.seed(std::random_device()());
+    m_dist = std::uniform_int_distribution<std::size_t>(0, 0);
+}
+
+template<typename T>
+inline math::Randomizer<T>::Randomizer(std::uint64_t seed)
+{
+    m_vector.clear();
+    m_twister.seed(seed);
+    m_dist = std::uniform_int_distribution<std::size_t>(0, 0);
+}
+
+template<typename T>
+inline void math::Randomizer<T>::add(const T& value)
+{
+    m_vector.push_back(value);
+    m_dist = std::uniform_int_distribution<std::size_t>(0, m_vector.size() - 1);
+}
+
+template<typename T>
+inline const T& math::Randomizer<T>::get(void)
+{
+    return m_vector.at(m_dist(m_twister));
+}
+
+template<typename T>
+inline void math::Randomizer<T>::clear(void)
+{
+    m_vector.clear();
+    m_dist = std::uniform_int_distribution<std::size_t>(0, 0);
+}
+
+#endif // CORE_MATH_RANDOMIZER_HH