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Have the random generators use the global rng instance

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This means that if you nest multiple random generators inside one
test case, they will not return the same sequence of numbers.

Idea taken from #1736 by Amit Herman.

Closes #1736
Closes #1734
This commit is contained in:
Martin Hořeňovský 2019-10-07 20:24:37 +02:00
parent 535da5c513
commit a5a22cdadb
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GPG key ID: DE48307B8B0D381A
2 changed files with 33 additions and 8 deletions
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14
include/internal/catch_generators_specific.hpp
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@ -10,6 +10,7 @@
#include "catch_context.h"
#include "catch_generators.hpp"
#include "catch_interfaces_config.h"
#include "catch_random_number_generator.h"
#include <random>
@ -18,14 +19,13 @@ namespace Generators {
template <typename Float>
class RandomFloatingGenerator final : public IGenerator<Float> {
// FIXME: What is the right seed?
std::minstd_rand m_rand;
Catch::SimplePcg32& m_rng;
std::uniform_real_distribution<Float> m_dist;
Float m_current_number;
public:
RandomFloatingGenerator(Float a, Float b):
m_rand(getCurrentContext().getConfig()->rngSeed()),
m_rng(rng()),
m_dist(a, b) {
static_cast<void>(next());
}
@ -34,20 +34,20 @@ public:
return m_current_number;
}
bool next() override {
m_current_number = m_dist(m_rand);
m_current_number = m_dist(m_rng);
return true;
}
};
template <typename Integer>
class RandomIntegerGenerator final : public IGenerator<Integer> {
std::minstd_rand m_rand;
Catch::SimplePcg32& m_rng;
std::uniform_int_distribution<Integer> m_dist;
Integer m_current_number;
public:
RandomIntegerGenerator(Integer a, Integer b):
m_rand(getCurrentContext().getConfig()->rngSeed()),
m_rng(rng()),
m_dist(a, b) {
static_cast<void>(next());
}
@ -56,7 +56,7 @@ public:
return m_current_number;
}
bool next() override {
m_current_number = m_dist(m_rand);
m_current_number = m_dist(m_rng);
return true;
}
};