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#pragma once
#include "StarString.hpp"
#include "StarXXHash.hpp"
namespace Star {
// Cross-platform, predictable random number generators based on XXHash.
// Supports primitive types as well as strings for input data.
inline void staticRandomHash32Iter(XXHash32&) {}
template <typename T, typename... TL>
void staticRandomHash32Iter(XXHash32& hash, T const& v, TL const&... rest) {
xxHash32Push(hash, v);
staticRandomHash32Iter(hash, rest...);
}
template <typename T, typename... TL>
uint32_t staticRandomHash32(T const& v, TL const&... rest) {
XXHash32 hash(2938728349u);
staticRandomHash32Iter(hash, v, rest...);
return hash.digest();
}
inline void staticRandomHash64Iter(XXHash64&) {}
template <typename T, typename... TL>
void staticRandomHash64Iter(XXHash64& hash, T const& v, TL const&... rest) {
xxHash64Push(hash, v);
staticRandomHash64Iter(hash, rest...);
}
template <typename T, typename... TL>
uint64_t staticRandomHash64(T const& v, TL const&... rest) {
XXHash64 hash(1997293021376312589);
staticRandomHash64Iter(hash, v, rest...);
return hash.digest();
}
template <typename T, typename... TL>
uint32_t staticRandomU32(T const& d, TL const&... rest) {
return staticRandomHash32(d, rest...);
}
template <typename T, typename... TL>
uint64_t staticRandomU64(T const& d, TL const&... rest) {
return staticRandomHash64(d, rest...);
}
template <typename T, typename... TL>
int32_t staticRandomI32(T const& d, TL const&... rest) {
return (int32_t)staticRandomU32(d, rest...);
}
template <typename T, typename... TL>
int32_t staticRandomI32Range(int32_t min, int32_t max, T const& d, TL const&... rest) {
uint64_t denom = (uint64_t)(-1) / ((uint64_t)(max - min) + 1);
return (int32_t)(staticRandomU64(d, rest...) / denom + min);
}
template <typename T, typename... TL>
uint32_t staticRandomU32Range(uint32_t min, uint32_t max, T const& d, TL const&... rest) {
uint64_t denom = (uint64_t)(-1) / ((uint64_t)(max - min) + 1);
return staticRandomU64(d, rest...) / denom + min;
}
template <typename T, typename... TL>
int64_t staticRandomI64(T const& d, TL const&... rest) {
return (int64_t)staticRandomU64(d, rest...);
}
// Generates values in the range [0.0, 1.0]
template <typename T, typename... TL>
float staticRandomFloat(T const& d, TL const&... rest) {
return (staticRandomU32(d, rest...) & 0x7fffffff) / 2147483648.0;
}
template <typename T, typename... TL>
float staticRandomFloatRange(float min, float max, T const& d, TL const&... rest) {
return staticRandomFloat(d, rest...) * (max - min) + min;
}
// Generates values in the range [0.0, 1.0]
template <typename T, typename... TL>
double staticRandomDouble(T const& d, TL const&... rest) {
return (staticRandomU64(d, rest...) & 0x7fffffffffffffff) / 9223372036854775808.0;
}
template <typename T, typename... TL>
double staticRandomDoubleRange(double min, double max, T const& d, TL const&... rest) {
return staticRandomDouble(d, rest...) * (max - min) + min;
}
template <typename Container, typename T, typename... TL>
typename Container::value_type& staticRandomFrom(Container& container, T const& d, TL const&... rest) {
auto i = container.begin();
std::advance(i, staticRandomI32Range(0, container.size() - 1, d, rest...));
return *i;
}
template <typename Container, typename T, typename... TL>
typename Container::value_type const& staticRandomFrom(Container const& container, T const& d, TL const&... rest) {
auto i = container.begin();
std::advance(i, staticRandomI32Range(0, container.size() - 1, d, rest...));
return *i;
}
template <typename Container, typename T, typename... TL>
typename Container::value_type staticRandomValueFrom(Container const& container, T const& d, TL const&... rest) {
if (container.empty()) {
return {};
} else {
auto i = container.begin();
std::advance(i, staticRandomI32Range(0, container.size() - 1, d, rest...));
return *i;
}
}
template <typename T>
class URBG {
public:
typedef function <T()> Function;
URBG(Function func) : m_func(func) {};
typedef T result_type;
static constexpr T min() { return std::numeric_limits<T>::min(); };
static constexpr T max() { return std::numeric_limits<T>::max(); };
T operator()() { return m_func(); };
private:
Function m_func;
};
template <typename Container, typename T, typename... TL>
void staticRandomShuffle(Container& container, T const& d, TL const&... rest) {
auto begin = container.begin();
auto end = container.end();
auto it = begin;
for (int i = 1, mix = 0; ++it != end; ++i) {
int off = staticRandomU32Range(0, i, ++mix, d, rest...);
if (off != i)
std::swap(*it, *(begin + off));
}
}
}
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