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Replaced use of std::rand with std::mt19937

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This uses a global instance of the RNG
This commit is contained in:
Phil Nash 2018-06-15 14:35:47 +01:00
parent 1dce91d78e
commit 35a57b070f
3 changed files with 14 additions and 31 deletions
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24
include/internal/catch_random_number_generator.cpp
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@ -9,23 +9,21 @@
#include "catch_context.h"
#include "catch_interfaces_config.h"
#include <cstdlib>
namespace Catch {
void seedRng( IConfig const& config ) {
if( config.rngSeed() != 0 )
std::srand( config.rngSeed() );
std::mt19937& rng() {
static std::mt19937 s_rng;
return s_rng;
}
void seedRng( IConfig const& config ) {
if( config.rngSeed() != 0 ) {
std::srand( config.rngSeed() );
rng().seed( config.rngSeed() );
}
}
unsigned int rngSeed() {
return getCurrentContext().getConfig()->rngSeed();
}
RandomNumberGenerator::result_type RandomNumberGenerator::operator()( result_type n ) const {
return std::rand() % n;
}
RandomNumberGenerator::result_type RandomNumberGenerator::operator()() const {
return std::rand() % (max)();
}
}

19
include/internal/catch_random_number_generator.h
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@ -8,31 +8,16 @@
#define TWOBLUECUBES_CATCH_RANDOM_NUMBER_GENERATOR_H_INCLUDED
#include <algorithm>
#include <random>
namespace Catch {
struct IConfig;
std::mt19937& rng();
void seedRng( IConfig const& config );
unsigned int rngSeed();
struct RandomNumberGenerator {
using result_type = unsigned int;
static constexpr result_type (min)() { return 0; }
static constexpr result_type (max)() { return 1000000; }
result_type operator()( result_type n ) const;
result_type operator()() const;
template<typename V>
static void shuffle( V& vector ) {
RandomNumberGenerator rng;
std::shuffle( vector.begin(), vector.end(), rng );
}
};
}
#endif // TWOBLUECUBES_CATCH_RANDOM_NUMBER_GENERATOR_H_INCLUDED

2
include/internal/catch_test_case_registry_impl.cpp
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@ -28,7 +28,7 @@ namespace Catch {
break;
case RunTests::InRandomOrder:
seedRng( config );
RandomNumberGenerator::shuffle( sorted );
std::shuffle( sorted.begin(), sorted.end(), rng() );
break;
case RunTests::InDeclarationOrder:
// already in declaration order