X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/0f14a8aa6fecc78bf48d772d3a5cb123a5f7ce4f..e71a2a302d28430dc1bfee906f842f5f3d0fa3ce:/include/xbt/random.hpp

diff --git a/include/xbt/random.hpp b/include/xbt/random.hpp
index 8175c69ac5..8510d35959 100644
--- a/include/xbt/random.hpp
+++ b/include/xbt/random.hpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2019-2020. The SimGrid Team. All rights reserved.               */
+/* Copyright (c) 2019-2021. The SimGrid Team. All rights reserved.               */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -7,7 +7,10 @@
 #define SIMGRID_XBT_RANDOM_HPP
 
 #include "xbt/base.h"
+#include <fstream>
+#include <iostream>
 #include <random>
+#include <string>
 
 namespace simgrid {
 namespace xbt {
@@ -25,7 +28,7 @@ public:
   /** @brief Build a new random number generator with default seed */
   Random() = default;
   /** @brief Build a new random number generator with given seed */
-  Random(int seed) : mt19937_gen(seed) {}
+  explicit Random(int seed) : mt19937_gen(seed) {}
 
   virtual ~Random() = default;
 
@@ -34,6 +37,16 @@ public:
    */
   void set_seed(int seed) { mt19937_gen.seed(seed); }
 
+  /**
+   * @brief Read the state of the Mersenne-Twister RNG from a file
+   */
+  bool read_state(const std::string& filename);
+
+  /**
+   * @brief Write the state of the Mersenne-Twister RNG to a file
+   */
+  bool write_state(const std::string& filename) const;
+
   /**
    * @brief Draws an integer number uniformly in range [min, max] (min and max included)
    *
@@ -72,8 +85,7 @@ public:
  */
 class XBT_PUBLIC StdRandom : public Random {
 public:
-  StdRandom() = default;
-  StdRandom(int seed) : Random(seed) {}
+  using Random::Random;
 
   int uniform_int(int min, int max) override;
   double uniform_real(double min, double max) override;
@@ -87,8 +99,7 @@ public:
  */
 class XBT_PUBLIC XbtRandom : public Random {
 public:
-  XbtRandom() = default;
-  XbtRandom(int seed) : Random(seed) {}
+  using Random::Random;
 
   int uniform_int(int min, int max) override;
   double uniform_real(double min, double max) override;
@@ -111,6 +122,16 @@ void set_implem_std();
  */
 void set_mersenne_seed(int);
 
+/**
+ * @brief Read the state of the Mersenne-Twister RNG from a file.
+ */
+bool read_mersenne_state(const std::string& filename);
+
+/**
+ * @brief Write the state of the Mersenne-Twister RNG to a file.
+ */
+bool write_mersenne_state(const std::string& filename);
+
 /**
  * @brief Draws an integer number uniformly in range [min, max] (min and max included)
  *