X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=ETL%2FETL%2F_random.h;fp=ETL%2FETL%2F_random.h;h=c358dfca09f66b41b21fbd1564faafbe39c187a9;hb=a095981e18cc37a8ecc7cd237cc22b9c10329264;hp=0000000000000000000000000000000000000000;hpb=9459638ad6797b8139f1e9f0715c96076dbf0890;p=synfig.git diff --git a/ETL/ETL/_random.h b/ETL/ETL/_random.h new file mode 100644 index 0000000..c358dfc --- /dev/null +++ b/ETL/ETL/_random.h @@ -0,0 +1,138 @@ +/*! ======================================================================== +** Extended Template and Library +** Random Number Generator Class Implementation +** $Id$ +** +** Copyright (c) 2002 Robert B. Quattlebaum Jr. +** +** This package is free software; you can redistribute it and/or +** modify it under the terms of the GNU General Public License as +** published by the Free Software Foundation; either version 2 of +** the License, or (at your option) any later version. +** +** This package is distributed in the hope that it will be useful, +** but WITHOUT ANY WARRANTY; without even the implied warranty of +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +** General Public License for more details. +** +** === N O T E S =========================================================== +** +** This is an internal header file, included by other ETL headers. +** You should not attempt to use it directly. +** +** ========================================================================= */ + +/* === S T A R T =========================================================== */ + +#ifndef __ETL__RANDOM_H +#define __ETL__RANDOM_H + +/* === H E A D E R S ======================================================= */ + +/* === M A C R O S ========================================================= */ + +/* === C L A S S E S & S T R U C T S ======================================= */ + +_ETL_BEGIN_NAMESPACE + +/* +class rand_source_xor +{ +public: + typedef int seed_type; + typedef short value_type; + +private: + short entropy_pool[256]; + int pool_index; + +public: + random() + { + seed(0); + mod=offset=0; + } + + void seed(const seed_type &x) + { pool_index=0; } + + void add_entropy(value_type entropy) + { + int i; + for(i=0;iPOOL_SIZE) + pool_index=0; + if(mod) + return entropy_pool[pool_index++]%mod+offset; + return entropy_pool[pool_index++]; + } +}; +*/ + +template +class random +{ +public: + typedef T value_type; + typedef int seed_type; + +private: + value_type entropy_pool[POOL_SIZE]; + int pool_index; + + value_type mod,offset; + +public: + random() + { + seed(0); + mod=offset=0; + } + + void seed(const seed_type &x __attribute__ ((unused))) + { pool_index=0; } + + void set_range(const value_type &floor,const value_type &ceil) + { mod=ceil-floor; offset=floor; } + + void set_range(const value_type &ceil) + { mod=ceil; } + + void add_entropy(value_type entropy) + { + int i; + for(i=0;iPOOL_SIZE) + pool_index=0; + if(mod) + return entropy_pool[pool_index++]%mod+offset; + return entropy_pool[pool_index++]; + } +}; + +/* === T Y P E D E F S ===================================================== */ + +_ETL_END_NAMESPACE + +/* === E N D =============================================================== */ + +#endif +