499 lines
20 KiB
C
499 lines
20 KiB
C
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// Copyright 2020 Phyronnaz
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#pragma once
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#include "CoreMinimal.h"
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#include <istream>
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#include <limits>
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// While random generators are standardized, samplers aren't
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// To avoid issues, we use the microsoft std version on all platforms
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// License:
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/*
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The Microsoft C++ Standard Library is under the Apache License v2.0 with LLVM Exception:
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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*/
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namespace cross_platform_std
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{
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// CLASS TEMPLATE _Rng_from_urng
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template <class _Diff, class _Urng>
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class _Rng_from_urng { // wrap a URNG as an RNG
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public:
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using _Ty0 = std::make_unsigned_t<_Diff>;
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using _Ty1 = typename _Urng::result_type;
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using _Udiff = std::conditional_t < sizeof(_Ty1) < sizeof(_Ty0), _Ty0, _Ty1 > ;
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explicit _Rng_from_urng(_Urng& _Func) : _Ref(_Func), _Bits(8 * sizeof(_Udiff)), _Bmask(_Udiff(-1)) {
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for (; (_Urng::max)() - (_Urng::min)() < _Bmask; _Bmask >>= 1) {
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--_Bits;
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}
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}
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_Diff operator()(_Diff _Index) { // adapt _Urng closed range to [0, _Index)
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for (;;) { // try a sample random value
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_Udiff _Ret = 0; // random bits
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_Udiff _Mask = 0; // 2^N - 1, _Ret is within [0, _Mask]
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while (_Mask < _Udiff(_Index - 1)) { // need more random bits
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_Ret <<= _Bits - 1; // avoid full shift
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_Ret <<= 1;
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_Ret |= _Get_bits();
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_Mask <<= _Bits - 1; // avoid full shift
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_Mask <<= 1;
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_Mask |= _Bmask;
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}
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// _Ret is [0, _Mask], _Index - 1 <= _Mask, return if unbiased
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if (_Ret / _Index < _Mask / _Index || _Mask % _Index == _Udiff(_Index - 1)) {
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return static_cast<_Diff>(_Ret % _Index);
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}
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}
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}
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_Udiff _Get_all_bits() { // return a random value
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_Udiff _Ret = 0;
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for (size_t _Num = 0; _Num < 8 * sizeof(_Udiff); _Num += _Bits) { // don't mask away any bits
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_Ret <<= _Bits - 1; // avoid full shift
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_Ret <<= 1;
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_Ret |= _Get_bits();
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}
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return _Ret;
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}
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_Rng_from_urng(const _Rng_from_urng&) = delete;
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_Rng_from_urng& operator=(const _Rng_from_urng&) = delete;
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private:
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_Udiff _Get_bits() { // return a random value within [0, _Bmask]
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for (;;) { // repeat until random value is in range
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_Udiff _Val = _Ref() - (_Urng::min)();
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if (_Val <= _Bmask) {
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return _Val;
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}
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}
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}
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_Urng& _Ref; // reference to URNG
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size_t _Bits; // number of random bits generated by _Get_bits()
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_Udiff _Bmask; // 2^_Bits - 1
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};
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// CLASS TEMPLATE uniform_int
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template <class _Ty = int>
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class uniform_int { // uniform integer distribution
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public:
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using result_type = _Ty;
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struct param_type { // parameter package
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using distribution_type = uniform_int;
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explicit param_type(result_type _Min0 = 0, result_type _Max0 = 9) { // construct from parameters
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_Init(_Min0, _Max0);
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}
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bool operator==(const param_type& _Right) const { // test for equality
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return _Min == _Right._Min && _Max == _Right._Max;
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}
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bool operator!=(const param_type& _Right) const { // test for inequality
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return !(*this == _Right);
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}
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result_type a() const { // return a value
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return _Min;
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}
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result_type b() const { // return b value
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return _Max;
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}
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void _Init(_Ty _Min0, _Ty _Max0) { // set internal state
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_Min = _Min0;
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_Max = _Max0;
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}
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result_type _Min;
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result_type _Max;
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};
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explicit uniform_int(_Ty _Min0 = 0, _Ty _Max0 = 9) : _Par(_Min0, _Max0) { // construct from parameters
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}
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explicit uniform_int(const param_type& _Par0) : _Par(_Par0) { // construct from parameter package
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}
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result_type a() const { // return a value
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return _Par.a();
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}
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result_type b() const { // return b value
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return _Par.b();
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}
|
||
|
|
|
||
|
|
param_type param() const { // return parameter package
|
||
|
|
return _Par;
|
||
|
|
}
|
||
|
|
|
||
|
|
void param(const param_type& _Par0) { // set parameter package
|
||
|
|
_Par = _Par0;
|
||
|
|
}
|
||
|
|
|
||
|
|
result_type(min)() const { // return minimum possible generated value
|
||
|
|
return _Par._Min;
|
||
|
|
}
|
||
|
|
|
||
|
|
result_type(max)() const { // return maximum possible generated value
|
||
|
|
return _Par._Max;
|
||
|
|
}
|
||
|
|
|
||
|
|
void reset() { // clear internal state
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class _Engine>
|
||
|
|
result_type operator()(_Engine& _Eng) const { // return next value
|
||
|
|
return _Eval(_Eng, _Par._Min, _Par._Max);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class _Engine>
|
||
|
|
result_type operator()(
|
||
|
|
_Engine& _Eng, const param_type& _Par0) const { // return next value, given parameter package
|
||
|
|
return _Eval(_Eng, _Par0._Min, _Par0._Max);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class _Engine>
|
||
|
|
result_type operator()(_Engine& _Eng, result_type _Nx) const { // return next value
|
||
|
|
return _Eval(_Eng, 0, _Nx - 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class _Elem, class _Traits>
|
||
|
|
std::basic_istream<_Elem, _Traits>& _Read(std::basic_istream<_Elem, _Traits>& _Istr) { // read state from _Istr
|
||
|
|
_Ty _Min0;
|
||
|
|
_Ty _Max0;
|
||
|
|
_Istr >> _Min0 >> _Max0;
|
||
|
|
_Par._Init(_Min0, _Max0);
|
||
|
|
return _Istr;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class _Elem, class _Traits>
|
||
|
|
std::basic_ostream<_Elem, _Traits>& _Write(std::basic_ostream<_Elem, _Traits>& _Ostr) const { // write state to _Ostr
|
||
|
|
return _Ostr << _Par._Min << ' ' << _Par._Max;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
using _Uty = std::make_unsigned_t<_Ty>;
|
||
|
|
|
||
|
|
template <class _Engine>
|
||
|
|
result_type _Eval(_Engine& _Eng, _Ty _Min, _Ty _Max) const { // compute next value in range [_Min, _Max]
|
||
|
|
_Rng_from_urng<_Uty, _Engine> _Rng(_Eng);
|
||
|
|
|
||
|
|
const _Uty _Umin = _Adjust(_Uty(_Min));
|
||
|
|
const _Uty _Umax = _Adjust(_Uty(_Max));
|
||
|
|
|
||
|
|
_Uty _Uret;
|
||
|
|
|
||
|
|
if (_Umax - _Umin == _Uty(-1)) {
|
||
|
|
_Uret = static_cast<_Uty>(_Rng._Get_all_bits());
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
_Uret = static_cast<_Uty>(_Rng(static_cast<_Uty>(_Umax - _Umin + 1)));
|
||
|
|
}
|
||
|
|
|
||
|
|
return _Ty(_Adjust(static_cast<_Uty>(_Uret + _Umin)));
|
||
|
|
}
|
||
|
|
|
||
|
|
static _Uty _Adjust(_Uty _Uval) { // convert signed ranges to unsigned ranges and vice versa
|
||
|
|
return _Adjust(_Uval, std::is_signed<_Ty>());
|
||
|
|
}
|
||
|
|
|
||
|
|
static _Uty _Adjust(_Uty _Uval, std::true_type) { // convert signed ranges to unsigned ranges and vice versa
|
||
|
|
const _Uty _Adjuster = (_Uty(-1) >> 1) + 1; // 2^(N-1)
|
||
|
|
|
||
|
|
if (_Uval < _Adjuster) {
|
||
|
|
return static_cast<_Uty>(_Uval + _Adjuster);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
return static_cast<_Uty>(_Uval - _Adjuster);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static _Uty _Adjust(_Uty _Uval, std::false_type) { // _Ty is already unsigned, do nothing
|
||
|
|
return _Uval;
|
||
|
|
}
|
||
|
|
|
||
|
|
param_type _Par;
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class _Elem, class _Traits, class _Ty>
|
||
|
|
std::basic_istream<_Elem, _Traits>& operator>>(std::basic_istream<_Elem, _Traits>& _Istr,
|
||
|
|
uniform_int<_Ty>& _Dist) { // read state from _Istr
|
||
|
|
return _Dist._Read(_Istr);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class _Elem, class _Traits, class _Ty>
|
||
|
|
std::basic_ostream<_Elem, _Traits>& operator<<(std::basic_ostream<_Elem, _Traits>& _Ostr,
|
||
|
|
const uniform_int<_Ty>& _Dist) { // write state to _Ostr
|
||
|
|
return _Dist._Write(_Ostr);
|
||
|
|
}
|
||
|
|
|
||
|
|
// CLASS TEMPLATE uniform_int_distribution
|
||
|
|
template <class _Ty = int>
|
||
|
|
class uniform_int_distribution : public uniform_int<_Ty> { // uniform integer distribution
|
||
|
|
public:
|
||
|
|
using _Mybase = uniform_int<_Ty>;
|
||
|
|
using _Mypbase = typename _Mybase::param_type;
|
||
|
|
using result_type = typename _Mybase::result_type;
|
||
|
|
|
||
|
|
struct param_type : public _Mypbase { // parameter package
|
||
|
|
using distribution_type = uniform_int_distribution;
|
||
|
|
|
||
|
|
explicit param_type(result_type _Min0 = 0, result_type _Max0 = (std::numeric_limits<_Ty>::max)())
|
||
|
|
: _Mypbase(_Min0, _Max0) { // construct from parameters
|
||
|
|
}
|
||
|
|
|
||
|
|
param_type(const _Mypbase& _Right) : _Mypbase(_Right) { // construct from base
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
explicit uniform_int_distribution(_Ty _Min0 = 0, _Ty _Max0 = (std::numeric_limits<_Ty>::max)())
|
||
|
|
: _Mybase(_Min0, _Max0) { // construct from parameters
|
||
|
|
}
|
||
|
|
|
||
|
|
explicit uniform_int_distribution(const param_type& _Par0) : _Mybase(_Par0) { // construct from parameter package
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class _Ty>
|
||
|
|
bool operator==(const uniform_int_distribution<_Ty>& _Left,
|
||
|
|
const uniform_int_distribution<_Ty>& _Right) { // test for equality
|
||
|
|
return _Left.param() == _Right.param();
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class _Ty>
|
||
|
|
bool operator!=(const uniform_int_distribution<_Ty>& _Left,
|
||
|
|
const uniform_int_distribution<_Ty>& _Right) { // test for inequality
|
||
|
|
return !(_Left == _Right);
|
||
|
|
}
|
||
|
|
}
|