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files >> //opt/alt/ruby31/include/ruby/internal/intern/random.h
#ifndef RBIMPL_INTERN_RANDOM_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_INTERN_RANDOM_H /** * @file * @author Ruby developers <ruby-core@ruby-lang.org> * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. * @brief MT19937 backended pseudo random number generator. * @see Matsumoto, M., Nishimura, T., "Mersenne Twister: A 623- * dimensionally equidistributed uniform pseudorandom number * generator", ACM Trans. on Modeling and Computer Simulation, 8 * (1): pp 3-30, 1998. https://doi.org/10.1145/272991.272995 */ #include "ruby/internal/dllexport.h" #include "ruby/internal/value.h" RBIMPL_SYMBOL_EXPORT_BEGIN() /* random.c */ /** * Generates a 32 bit random number. * * @return A random number. * @note Now that we have ractors, the RNG behind this function is * per-ractor. */ unsigned int rb_genrand_int32(void); /** * Generates a `double` random number. * * @return A random number. * @note This function shares the RNG with rb_genrand_int32(). */ double rb_genrand_real(void); /** * Resets the RNG behind rb_genrand_int32()/rb_genrand_real(). * * @post The (now per-ractor) default RNG's internal state is cleared. */ void rb_reset_random_seed(void); /** * Generates a String of random bytes. * * @param[in,out] rnd An instance of ::rb_cRandom. * @param[in] n Requested number of bytes. * @return An instance of ::rb_cString, of binary, of `n` bytes length, * whose contents are random bits. * * @internal * * @shyouhei doesn't know if this is an Easter egg or an official feature, but * this function can take a wider range of objects, such as `Socket::Ifaddr`. * The arguments are just silently ignored and the default RNG is used instead, * if they are non-RNG. */ VALUE rb_random_bytes(VALUE rnd, long n); /** * Identical to rb_genrand_int32(), except it generates using the passed RNG. * * @param[in,out] rnd An instance of ::rb_cRandom. * @return A random number. */ unsigned int rb_random_int32(VALUE rnd); /** * Identical to rb_genrand_real(), except it generates using the passed RNG. * * @param[in,out] rnd An instance of ::rb_cRandom. * @return A random number. */ double rb_random_real(VALUE rnd); /** * Identical to rb_genrand_ulong_limited(), except it generates using the * passed RNG. * * @param[in,out] rnd An instance of ::rb_cRandom. * @param[in] limit Max possible return value. * @return A random number, distributed in `[0, limit]` interval. * @note Note it can return `limit`. * @note Whether the return value distributes uniformly in the * interval or not depends on how the argument RNG behaves; at * least in case of MT19937 it does. */ unsigned long rb_random_ulong_limited(VALUE rnd, unsigned long limit); /** * Generates a random number whose upper limit is `i`. * * @param[in] i Max possible return value. * @return A random number, uniformly distributed in `[0, limit]` interval. * @note Note it can return `i`. */ unsigned long rb_genrand_ulong_limited(unsigned long i); RBIMPL_SYMBOL_EXPORT_END() #endif /* RBIMPL_INTERN_RANDOM_H */
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