X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d2182f07ffae5d26030b8f05cb2f3eb845c5bb4d..e849e1972a7b33aa47d7ec35420e66b7bca9ccba:/src/xbt/random.cpp

diff --git a/src/xbt/random.cpp b/src/xbt/random.cpp
index 3b2962fb85..5160ba3c7f 100644
--- a/src/xbt/random.cpp
+++ b/src/xbt/random.cpp
@@ -3,16 +3,42 @@
 /* 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. */
 
-#include "xbt/random.hpp"
 #include "xbt/asserts.h"
+#include <fstream>
+#include <iostream>
 #include <limits>
 #include <memory>
 #include <string>
+#include <xbt/log.hpp>
+#include <xbt/random.hpp>
+
+XBT_LOG_EXTERNAL_CATEGORY(xbt);
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_random, xbt, "Random");
 
 namespace simgrid {
 namespace xbt {
 namespace random {
 
+bool Random::read_state(const std::string& filename)
+{
+  std::ifstream file(filename);
+  file >> mt19937_gen;
+  file.close();
+  if (file.fail())
+    XBT_WARN("Could not save the RNG state to file %s.", filename.c_str());
+  return not file.fail();
+}
+
+bool Random::write_state(const std::string& filename) const
+{
+  std::ofstream file(filename);
+  file << mt19937_gen;
+  file.close();
+  if (file.fail())
+    XBT_WARN("Could not read the RNG state from file %s.", filename.c_str());
+  return not file.fail();
+}
+
 int StdRandom::uniform_int(int min, int max)
 {
   std::uniform_int_distribution<> dist(min, max);
@@ -47,7 +73,7 @@ int XbtRandom::uniform_int(int min, int max)
   do {
     value = mt19937_gen();
   } while (value >= decltype(mt19937_gen)::max() - decltype(mt19937_gen)::max() % range);
-  return value % range + min;
+  return static_cast<int>(value % range + min);
 }
 
 double XbtRandom::uniform_real(double min, double max)
@@ -58,7 +84,7 @@ double XbtRandom::uniform_real(double min, double max)
   do {
     numerator = mt19937_gen() - decltype(mt19937_gen)::min();
   } while (numerator == divisor);
-  return min + (max - min) * numerator / divisor;
+  return min + (max - min) * static_cast<double>(numerator) / divisor;
 }
 
 double XbtRandom::exponential(double lambda)
@@ -77,15 +103,15 @@ double XbtRandom::normal(double mean, double sd)
   return z0 * sd + mean;
 }
 
-static std::unique_ptr<Random> default_random(new XbtRandom);
+static std::unique_ptr<Random> default_random = std::make_unique<XbtRandom>();
 
 void set_implem_xbt()
 {
-  default_random.reset(new XbtRandom);
+  default_random = std::make_unique<XbtRandom>();
 }
 void set_implem_std()
 {
-  default_random.reset(new StdRandom);
+  default_random = std::make_unique<StdRandom>();
 }
 
 void set_mersenne_seed(int seed)
@@ -93,14 +119,14 @@ void set_mersenne_seed(int seed)
   default_random->set_seed(seed);
 }
 
-void read_mersenne_state(std::string filename)
+bool read_mersenne_state(const std::string& filename)
 {
-  default_random->read_state(filename);
+  return default_random->read_state(filename);
 }
 
-void write_mersenne_state(std::string filename)
+bool write_mersenne_state(const std::string& filename)
 {
-  default_random->write_state(filename);
+  return default_random->write_state(filename);
 }
 
 int uniform_int(int min, int max)