/* 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);
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)
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)
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)
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)