mirror of
https://github.com/zenorogue/hyperrogue.git
synced 2024-12-20 23:50:27 +00:00
removed the obsolete implementation of Mersenne Twister
This commit is contained in:
Zeno Rogue
parent
a50fb62af0
commit
d751e84a54
51
mtrand.cpp
51
mtrand.cpp
@ -1,51 +0,0 @@
|
||||
// mtrand.cpp, see include file mtrand.h for information
|
||||
|
||||
#include "mtrand.h"
|
||||
// non-inline function definitions and static member definitions cannot
|
||||
// reside in header file because of the risk of multiple declarations
|
||||
|
||||
// initialization of static private members
|
||||
unsigned long MTRand_int32::state[n] = {0x0UL};
|
||||
int MTRand_int32::p = 0;
|
||||
bool MTRand_int32::init = false;
|
||||
|
||||
void MTRand_int32::gen_state() { // generate new state vector
|
||||
for (int i = 0; i < (n - m); ++i)
|
||||
state[i] = state[i + m] ^ twiddle(state[i], state[i + 1]);
|
||||
for (int i = n - m; i < (n - 1); ++i)
|
||||
state[i] = state[i + m - n] ^ twiddle(state[i], state[i + 1]);
|
||||
state[n - 1] = state[m - 1] ^ twiddle(state[n - 1], state[0]);
|
||||
p = 0; // reset position
|
||||
}
|
||||
|
||||
void MTRand_int32::seed(unsigned long s) { // init by 32 bit seed
|
||||
state[0] = s & 0xFFFFFFFFUL; // for > 32 bit machines
|
||||
for (int i = 1; i < n; ++i) {
|
||||
state[i] = 1812433253UL * (state[i - 1] ^ (state[i - 1] >> 30)) + i;
|
||||
// see Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier
|
||||
// in the previous versions, MSBs of the seed affect only MSBs of the array state
|
||||
// 2002/01/09 modified by Makoto Matsumoto
|
||||
state[i] &= 0xFFFFFFFFUL; // for > 32 bit machines
|
||||
}
|
||||
p = n; // force gen_state() to be called for next random number
|
||||
}
|
||||
|
||||
void MTRand_int32::seed(const unsigned long* array, int size) { // init by array
|
||||
seed(19650218UL);
|
||||
int i = 1, j = 0;
|
||||
for (int k = ((n > size) ? n : size); k; --k) {
|
||||
state[i] = (state[i] ^ ((state[i - 1] ^ (state[i - 1] >> 30)) * 1664525UL))
|
||||
+ array[j] + j; // non linear
|
||||
state[i] &= 0xFFFFFFFFUL; // for > 32 bit machines
|
||||
++j; j %= size;
|
||||
if ((++i) == n) { state[0] = state[n - 1]; i = 1; }
|
||||
}
|
||||
for (int k = n - 1; k; --k) {
|
||||
state[i] = (state[i] ^ ((state[i - 1] ^ (state[i - 1] >> 30)) * 1566083941UL)) - i;
|
||||
state[i] &= 0xFFFFFFFFUL; // for > 32 bit machines
|
||||
if ((++i) == n) { state[0] = state[n - 1]; i = 1; }
|
||||
}
|
||||
state[0] = 0x80000000UL; // MSB is 1; assuring non-zero initial array
|
||||
p = n; // force gen_state() to be called for next random number
|
||||
}
|
||||
|
||||
158
mtrand.h
158
mtrand.h
@ -1,158 +0,0 @@
|
||||
|
||||
|
||||
// mtrand.h
|
||||
// C++ include file for MT19937, with initialization improved 2002/1/26.
|
||||
// Coded by Takuji Nishimura and Makoto Matsumoto.
|
||||
// Ported to C++ by Jasper Bedaux 2003/1/1 (see http://www.bedaux.net/mtrand/).
|
||||
// The generators returning floating point numbers are based on
|
||||
// a version by Isaku Wada, 2002/01/09
|
||||
//
|
||||
// Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
|
||||
// All rights reserved.
|
||||
//
|
||||
// Redistribution and use in source and binary forms, with or without
|
||||
// modification, are permitted provided that the following conditions
|
||||
// are met:
|
||||
//
|
||||
// 1. Redistributions of source code must retain the above copyright
|
||||
// notice, this list of conditions and the following disclaimer.
|
||||
//
|
||||
// 2. Redistributions in binary form must reproduce the above copyright
|
||||
// notice, this list of conditions and the following disclaimer in the
|
||||
// documentation and/or other materials provided with the distribution.
|
||||
//
|
||||
// 3. The names of its contributors may not be used to endorse or promote
|
||||
// products derived from this software without specific prior written
|
||||
// permission.
|
||||
//
|
||||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
||||
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||||
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||||
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
||||
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
||||
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
||||
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
//
|
||||
// Any feedback is very welcome.
|
||||
// http://www.math.keio.ac.jp/matumoto/emt.html
|
||||
// email: matumoto@math.keio.ac.jp
|
||||
//
|
||||
// Feedback about the C++ port should be sent to Jasper Bedaux,
|
||||
// see http://www.bedaux.net/mtrand/ for e-mail address and info.
|
||||
|
||||
#ifndef MTRAND_H
|
||||
#define MTRAND_H
|
||||
|
||||
class MTRand_int32 { // Mersenne Twister random number generator
|
||||
public:
|
||||
// default constructor: uses default seed only if this is the first instance
|
||||
MTRand_int32() { if (!init) seed(5489UL); init = true; }
|
||||
// constructor with 32 bit int as seed
|
||||
MTRand_int32(unsigned long s) { seed(s); init = true; }
|
||||
// constructor with array of size 32 bit ints as seed
|
||||
MTRand_int32(const unsigned long* array, int size) { seed(array, size); init = true; }
|
||||
// the two seed functions
|
||||
void seed(unsigned long); // seed with 32 bit integer
|
||||
void seed(const unsigned long*, int size); // seed with array
|
||||
// overload operator() to make this a generator (functor)
|
||||
unsigned long operator()() { return rand_int32(); }
|
||||
// 2007-02-11: made the destructor virtual; thanks "double more" for pointing this out
|
||||
virtual ~MTRand_int32() {} // destructor
|
||||
protected: // used by derived classes, otherwise not accessible; use the ()-operator
|
||||
unsigned long rand_int32(); // generate 32 bit random integer
|
||||
private:
|
||||
static const int n = 624, m = 397; // compile time constants
|
||||
// the variables below are static (no duplicates can exist)
|
||||
static unsigned long state[n]; // state vector array
|
||||
static int p; // position in state array
|
||||
static bool init; // true if init function is called
|
||||
// private functions used to generate the pseudo random numbers
|
||||
unsigned long twiddle(unsigned long, unsigned long); // used by gen_state()
|
||||
void gen_state(); // generate new state
|
||||
// make copy constructor and assignment operator unavailable, they don't make sense
|
||||
MTRand_int32(const MTRand_int32&); // copy constructor not defined
|
||||
void operator=(const MTRand_int32&); // assignment operator not defined
|
||||
};
|
||||
|
||||
// inline for speed, must therefore reside in header file
|
||||
inline unsigned long MTRand_int32::twiddle(unsigned long u, unsigned long v) {
|
||||
return (((u & 0x80000000UL) | (v & 0x7FFFFFFFUL)) >> 1)
|
||||
^ ((v & 1UL) * 0x9908B0DFUL);
|
||||
// 2013-07-22: line above modified for performance according to http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/Ierymenko.html
|
||||
// thanks Vitaliy FEOKTISTOV for pointing this out
|
||||
}
|
||||
|
||||
inline unsigned long MTRand_int32::rand_int32() { // generate 32 bit random int
|
||||
if (p == n) gen_state(); // new state vector needed
|
||||
// gen_state() is split off to be non-inline, because it is only called once
|
||||
// in every 624 calls and otherwise irand() would become too big to get inlined
|
||||
unsigned long x = state[p++];
|
||||
x ^= (x >> 11);
|
||||
x ^= (x << 7) & 0x9D2C5680UL;
|
||||
x ^= (x << 15) & 0xEFC60000UL;
|
||||
return x ^ (x >> 18);
|
||||
}
|
||||
|
||||
// generates double floating point numbers in the half-open interval [0, 1)
|
||||
class MTRand : public MTRand_int32 {
|
||||
public:
|
||||
MTRand() : MTRand_int32() {}
|
||||
MTRand(unsigned long seed) : MTRand_int32(seed) {}
|
||||
MTRand(const unsigned long* seed, int size) : MTRand_int32(seed, size) {}
|
||||
~MTRand() {}
|
||||
double operator()() {
|
||||
return static_cast<double>(rand_int32()) * (1. / 4294967296.); } // divided by 2^32
|
||||
private:
|
||||
MTRand(const MTRand&); // copy constructor not defined
|
||||
void operator=(const MTRand&); // assignment operator not defined
|
||||
};
|
||||
|
||||
// generates double floating point numbers in the closed interval [0, 1]
|
||||
class MTRand_closed : public MTRand_int32 {
|
||||
public:
|
||||
MTRand_closed() : MTRand_int32() {}
|
||||
MTRand_closed(unsigned long seed) : MTRand_int32(seed) {}
|
||||
MTRand_closed(const unsigned long* seed, int size) : MTRand_int32(seed, size) {}
|
||||
~MTRand_closed() {}
|
||||
double operator()() {
|
||||
return static_cast<double>(rand_int32()) * (1. / 4294967295.); } // divided by 2^32 - 1
|
||||
private:
|
||||
MTRand_closed(const MTRand_closed&); // copy constructor not defined
|
||||
void operator=(const MTRand_closed&); // assignment operator not defined
|
||||
};
|
||||
|
||||
// generates double floating point numbers in the open interval (0, 1)
|
||||
class MTRand_open : public MTRand_int32 {
|
||||
public:
|
||||
MTRand_open() : MTRand_int32() {}
|
||||
MTRand_open(unsigned long seed) : MTRand_int32(seed) {}
|
||||
MTRand_open(const unsigned long* seed, int size) : MTRand_int32(seed, size) {}
|
||||
~MTRand_open() {}
|
||||
double operator()() {
|
||||
return (static_cast<double>(rand_int32()) + .5) * (1. / 4294967296.); } // divided by 2^32
|
||||
private:
|
||||
MTRand_open(const MTRand_open&); // copy constructor not defined
|
||||
void operator=(const MTRand_open&); // assignment operator not defined
|
||||
};
|
||||
|
||||
// generates 53 bit resolution doubles in the half-open interval [0, 1)
|
||||
class MTRand53 : public MTRand_int32 {
|
||||
public:
|
||||
MTRand53() : MTRand_int32() {}
|
||||
MTRand53(unsigned long seed) : MTRand_int32(seed) {}
|
||||
MTRand53(const unsigned long* seed, int size) : MTRand_int32(seed, size) {}
|
||||
~MTRand53() {}
|
||||
double operator()() {
|
||||
return (static_cast<double>(rand_int32() >> 5) * 67108864. +
|
||||
static_cast<double>(rand_int32() >> 6)) * (1. / 9007199254740992.); }
|
||||
private:
|
||||
MTRand53(const MTRand53&); // copy constructor not defined
|
||||
void operator=(const MTRand53&); // assignment operator not defined
|
||||
};
|
||||
|
||||
#endif // MTRAND_H
|
||||
|
||||
Loading…
Reference in New Issue
Block a user