summaryrefslogtreecommitdiffstats
path: root/src/MersenneTwister.h
diff options
context:
space:
mode:
authorHowaner <franzi.moos@googlemail.com>2014-11-18 14:56:32 +0100
committerHowaner <franzi.moos@googlemail.com>2014-11-18 14:56:32 +0100
commit42120e2ea5db0cdb9920ff1c5efef33e0f496d48 (patch)
tree20ba1ae0a53f757cb8814b6cd6a466fe5acf1308 /src/MersenneTwister.h
parentFixed compile errors. (diff)
parentMerge pull request #1598 from mc-server/SignEditor (diff)
downloadcuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar
cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.gz
cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.bz2
cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.lz
cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.xz
cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.tar.zst
cuberite-42120e2ea5db0cdb9920ff1c5efef33e0f496d48.zip
Diffstat (limited to 'src/MersenneTwister.h')
-rw-r--r--src/MersenneTwister.h44
1 files changed, 22 insertions, 22 deletions
diff --git a/src/MersenneTwister.h b/src/MersenneTwister.h
index 759b8a1ae..e83a470e2 100644
--- a/src/MersenneTwister.h
+++ b/src/MersenneTwister.h
@@ -19,11 +19,11 @@
// Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
// Copyright (C) 2000 - 2009, Richard J. Wagner
// 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.
//
@@ -31,10 +31,10 @@
// 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
+// 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
@@ -63,13 +63,13 @@ class MTRand {
// Data
public:
typedef UInt32 uint32; // unsigned integer type, at least 32 bits
-
+
enum { N = 624 }; // length of state vector
enum { SAVE = N + 1 }; // length of array for save()
protected:
enum { M = 397 }; // period parameter
-
+
uint32 state[N]; // internal state
uint32 *pNext; // next value to get from state
uint32 left; // number of values left before reload needed
@@ -80,11 +80,11 @@ public:
MTRand( uint32 *const bigSeed, uint32 const seedLength = N ); // or array
MTRand(); // auto-initialize with /dev/urandom or time() and clock()
MTRand( const MTRand& o ); // copy
-
+
// Do NOT use for CRYPTOGRAPHY without securely hashing several returned
// values together, otherwise the generator state can be learned after
// reading 624 consecutive values.
-
+
// Access to 32-bit random numbers
uint32 randInt(); // integer in [0,2^32-1]
uint32 randInt( const uint32 n ); // integer in [0,n] for n < 2^32
@@ -95,18 +95,18 @@ public:
double randDblExc(); // real number in (0,1)
double randDblExc( const double n ); // real number in (0,n)
double operator()(); // same as rand()
-
+
// Access to 53-bit random numbers (capacity of IEEE double precision)
double rand53(); // real number in [0,1)
-
+
// Access to nonuniform random number distributions
double randNorm( const double mean = 0.0, const double stddev = 1.0 );
-
+
// Re-seeding functions with same behavior as initializers
void seed( const uint32 oneSeed );
void seed( uint32 *const bigSeed, const uint32 seedLength = N );
void seed();
-
+
// Saving and loading generator state
void save( uint32* saveArray ) const; // to array of size SAVE
void load( uint32 *const loadArray ); // from such array
@@ -136,9 +136,9 @@ inline MTRand::uint32 MTRand::hash( time_t t, clock_t c )
// Get a uint32 from t and c
// Better than uint32(x) in case x is floating point in [0,1]
// Based on code by Lawrence Kirby (fred@genesis.demon.co.uk)
-
+
static uint32 differ = 0; // guarantee time-based seeds will change
-
+
uint32 h1 = 0;
unsigned char *p = (unsigned char *) &t;
for( size_t i = 0; i < sizeof(t); ++i )
@@ -185,7 +185,7 @@ inline void MTRand::reload()
for( i = M; --i; ++p )
*p = twist( p[MmN], p[0], p[1] );
*p = twist( p[MmN], p[0], state[0] );
-
+
left = N, pNext = state;
}
@@ -207,7 +207,7 @@ inline void MTRand::seed( uint32 *const bigSeed, const uint32 seedLength )
initialize(19650218UL);
uint32 i = 1;
uint32 j = 0;
- uint32 k = ( (uint32)N > seedLength ? (uint32)N : seedLength );
+ uint32 k = ( static_cast<uint32>(N) > seedLength ? static_cast<uint32>(N) : seedLength );
for( ; k; --k )
{
state[i] =
@@ -235,7 +235,7 @@ inline void MTRand::seed()
{
// Seed the generator with an array from /dev/urandom if available
// Otherwise use a hash of time() and clock() values
-
+
// First try getting an array from /dev/urandom
/* // Commented out by FakeTruth because doing this 200 times a tick is SUUUUPEERRR SLOW!!~~!\D5Ne
@@ -252,7 +252,7 @@ inline void MTRand::seed()
if( success ) { seed( bigSeed, N ); return; }
}
*/
-
+
// Was not successful, so use time() and clock() instead
seed( hash( time(NULL), clock() ) );
}
@@ -280,10 +280,10 @@ inline MTRand::uint32 MTRand::randInt()
{
// Pull a 32-bit integer from the generator state
// Every other access function simply transforms the numbers extracted here
-
+
if( left == 0 ) reload();
--left;
-
+
uint32 s1;
s1 = *pNext++;
s1 ^= (s1 >> 11);
@@ -302,7 +302,7 @@ inline MTRand::uint32 MTRand::randInt( const uint32 n )
used |= used >> 4;
used |= used >> 8;
used |= used >> 16;
-
+
// Draw numbers until one is found in [0,n]
uint32 i;
do