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Tweaks for Random class.
continuous-integration/drone/push Build is passing Details

This commit is contained in:
Deukhoofd 2020-02-26 13:27:56 +01:00
parent 729a1d82f7
commit 5d620e8ee7
Signed by: Deukhoofd
GPG Key ID: ADF2E9256009EDCE
3 changed files with 16 additions and 19 deletions
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1
CMakeLists.txt
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@ -6,6 +6,7 @@ set(CMAKE_CXX_STANDARD 17)
file(GLOB_RECURSE SRC_FILES "src/*.cpp" "src/*.hpp")
add_library(Arbutils SHARED ${SRC_FILES})
set_target_properties(Arbutils PROPERTIES LINKER_LANGUAGE CXX)
file(GLOB_RECURSE TEST_FILES "tests/*.cpp" "tests/*.hpp")
add_executable(ArbutilsTests ${TEST_FILES} extern/catch.hpp)

9
src/Random.cpp
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@ -1,9 +0,0 @@
#include "Random.hpp"
#include <chrono>
// Seed parameterless constructor with current milliseconds since epoch.
template <class RandomT>
Arbutils::BaseRandom<RandomT>::BaseRandom()
: _rng(RandomT(
std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch())
.count())) {}

25
src/Random.hpp
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@ -3,6 +3,7 @@
#include <cstdint>
#include <random>
#include <chrono>
namespace Arbutils {
@ -11,53 +12,57 @@ namespace Arbutils {
RandomT _rng;
public:
BaseRandom();
explicit BaseRandom(int32_t seed) : _rng(seed){};
inline constexpr BaseRandom()
: _rng(RandomT(
std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch())
.count())) {}
explicit inline constexpr BaseRandom(int32_t seed) : _rng(seed){};
/// Gets a random float between 0.0 and 1.0.
[[nodiscard]] inline float GetFloat() {
[[nodiscard]] inline constexpr float GetFloat() {
return static_cast<float>(_rng()) / (static_cast<float>(std::mt19937::max() - std::mt19937::min()) - 0.5f);
}
/// Gets a random double between 0.0 and 1.0.
[[nodiscard]] inline double GetDouble() {
[[nodiscard]] inline constexpr double GetDouble() {
return static_cast<double>(_rng()) /
((static_cast<double>(std::mt19937::max()) - std::mt19937::min()) - 0.5);
}
/// Gets a random 32 bit integer between 0 and max int.
[[nodiscard]] inline int32_t Get() {
[[nodiscard]] inline constexpr int32_t Get() {
return static_cast<int32_t>(GetDouble() * static_cast<float>(std::numeric_limits<int32_t>::max()));
}
/// Gets a random 32 bit integer between 0, and given max parameter.
/// \param max The exclusive max value the random value should be.
[[nodiscard]] inline int32_t Get(int32_t max) {
[[nodiscard]] inline constexpr int32_t Get(int32_t max) {
return static_cast<int32_t>(GetDouble() * static_cast<float>(max));
}
/// Gets a random 32 bit integer between given min and max parameters.
/// \param min The inclusive min value the random value should be.
/// \param max The exclusive max value the random value should be.
[[nodiscard]] inline int32_t Get(int32_t min, int32_t max) {
[[nodiscard]] inline constexpr int32_t Get(int32_t min, int32_t max) {
return static_cast<int32_t>(GetDouble() * static_cast<float>(max - min) + min);
}
/// Gets a random 32 bit unsigned integer between 0 and max unsigned int.
[[nodiscard]] inline uint32_t GetUnsigned() {
[[nodiscard]] inline constexpr uint32_t GetUnsigned() {
return static_cast<int32_t>(GetDouble() * static_cast<float>(std::numeric_limits<uint32_t>::max()));
}
/// Gets a random 32 bit unsigned integer between 0, and given max parameter.
/// \param max The exclusive max value the random value should be.
[[nodiscard]] inline uint32_t GetUnsigned(uint32_t max) {
[[nodiscard]] inline constexpr uint32_t GetUnsigned(uint32_t max) {
return static_cast<int32_t>(GetDouble() * static_cast<float>(max));
}
/// Gets a random 32 bit unsigned integer between given min and max parameters.
/// \param min The inclusive min value the random value should be.
/// \param max The exclusive max value the random value should be.
[[nodiscard]] inline uint32_t GetUnsigned(uint32_t min, uint32_t max) {
[[nodiscard]] inline constexpr uint32_t GetUnsigned(uint32_t min, uint32_t max) {
return static_cast<int32_t>(GetDouble() * static_cast<float>(max - min) + min);
}
};