Adding in files

include/shared_random_generator/random.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <memory>
+
+namespace engine {
+  namespace detail {
+    struct random_impl;
+  }
+
+  class random_number_generator {
+  public:
+    random_number_generator();
+    template <typename Provider>
+    random_number_generator(Provider const & p)
+        : p_impl(std::make_shared<Provider>(p)) {}
+    template <typename Provider>
+    random_number_generator(std::shared_ptr<Provider> const & p) : p_impl(p) {}
+    unsigned int exclusive(unsigned int max) const;
+    double exclusive(double min, double max) const;
+    double inclusive(double min, double max) const;
+
+  private:
+    std::shared_ptr<detail::random_impl> p_impl;
+  };
+}

include/shared_random_generator/random_impl.h

@@ -0,0 +1,17 @@
+//
+//  random_impl.h
+//  pokemon
+//
+//  Created by Sam Jaffe on 12/9/17.
+//
+
+#pragma once
+
+namespace engine { namespace detail {
+  struct random_impl {
+    virtual ~random_impl() = default;
+    virtual unsigned int exclusive(unsigned int max) = 0;
+    virtual double exclusive(double min, double max) = 0;
+    virtual double inclusive(double min, double max) = 0;
+  };
+}}

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@@ -0,0 +1,299 @@
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+}

src/random.cxx

@@ -0,0 +1,49 @@
+#include <cassert>
+#include <cfloat>
+#include <random>
+
+#include "shared_random_generator/random.h"
+#include "shared_random_generator/random_impl.h"
+
+namespace {
+  class default_random_number_generator : public engine::detail::random_impl {
+  public:
+    unsigned int exclusive(unsigned int max) override {
+      assert(max != 0);
+      return uniform(0, max - 1)(rng);
+    }
+
+    double exclusive(double min, double max) override {
+      return uniform_real(min, max)(rng);
+    }
+
+    double inclusive(double min, double max) override {
+      double real_max = std::nextafter(max, DBL_MAX);
+      return std::min(uniform_real(min, real_max)(rng), max);
+    }
+
+  private:
+    using engine = std::mt19937;
+    using uniform = std::uniform_int_distribution<typename engine::result_type>;
+    using uniform_real = std::uniform_real_distribution<>;
+
+    engine rng{std::random_device{}()};
+  };
+}
+
+namespace engine {
+  random_number_generator::random_number_generator()
+      : p_impl(std::make_shared<default_random_number_generator>()) {}
+
+  unsigned int random_number_generator::exclusive(unsigned int max) const {
+    return p_impl->exclusive(max);
+  }
+
+  double random_number_generator::exclusive(double min, double max) const {
+    return p_impl->exclusive(min, max);
+  }
+
+  double random_number_generator::inclusive(double min, double max) const {
+    return p_impl->inclusive(min, max);
+  }
+}