mirror of
https://gitlab.gnome.org/GNOME/glib.git
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Added inline documentation.
2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
* grand.c: Added inline documentation.
* docs/refernce/glib/glib-sections.txt: Added misc items.
* docs/refernce/glib/tmpl/random_numbers.sgml: Documentation for
the random number generator.
This commit is contained in:
Sebastian Wilhelmi
Sebastian Wilhelmi
parent
24b4bfbea1
commit
eb27cad0f0
@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,5 +1,7 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* grand.c: Added inline documentation.
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* gtypes.h, gnode.h, gutils.h: Readded GFreeFunc,
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g_node_insert_after and g_find_program_in_path resp., which
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mysteriously disappeared during the glib.h dissection.
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@ -1,3 +1,10 @@
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2000-10-13 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
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* glib/glib-sections.txt: Added misc items.
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* glib/tmpl/random_numbers.sgml: Documentation for the random
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number generator.
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2000-10-09 Raja R Harinath <harinath@cs.umn.edu>
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* gobject/Makefile.am (DOC_SOURCE_DIR): Don't set to
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@ -255,6 +255,10 @@ G_INLINE_FUNC
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G_STMT_START
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G_STMT_END
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<SUBSECTION>
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G_BEGIN_DECLS
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G_END_DECLS
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<SUBSECTION>
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G_N_ELEMENTS
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@ -269,6 +273,7 @@ G_GNUC_EXTENSION
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G_GNUC_CONST
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G_GNUC_NORETURN
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G_GNUC_UNUSED
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G_GNUC_PURE
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G_GNUC_PRINTF
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G_GNUC_SCANF
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G_GNUC_FORMAT
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@ -359,6 +364,8 @@ g_source_remove_by_user_data
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<SUBSECTION Private>
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GLIB_HAVE_SYS_POLL_H
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GLIB_HAVE_ALLOCA_H
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alloca
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GLIB_SYSDEF_POLLERR
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GLIB_SYSDEF_POLLHUP
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GLIB_SYSDEF_POLLIN
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@ -466,9 +473,15 @@ g_static_private_set
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g_static_private_set_for_thread
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<SUBSECTION Private>
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G_THREAD_ECF
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G_THREAD_CF
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G_THREAD_UF
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g_static_mutex_get_mutex_impl
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g_mutex_lock_with_debug_name
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g_mutex_trylock_with_debug_name
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g_mutex_unlock_with_debug_name
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G_MUTEX_DEBUG_MAGIC
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g_thread_init_with_errorcheck_mutexes
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G_LOCK_NAME
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glib_dummy_decl
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GSystemThread
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@ -575,6 +588,9 @@ g_realloc
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<SUBSECTION>
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g_free
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<SUBSECTION>
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g_alloca
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<SUBSECTION>
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g_memmove
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g_memdup
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@ -2,139 +2,60 @@
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Random Numbers
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<!-- ##### SECTION Short_Description ##### -->
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pseudo random number generator.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The following functions allow you to use a portable, fast and good
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pseudo random number generator (PRNG). It uses the Mersenne Twister
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PRNG, which was originally developed by Makoto Matsumoto and Takuji
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Nishimura. Further information can be found at <ulink
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url="http://www.math.keio.ac.jp/~matumoto/emt.html"
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>www.math.keio.ac.jp/~matumoto/emt.html</ulink>.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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If you just need a random number, you simply call the g_random_*
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functions, which will create a globally used #GRand and use the
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according g_rand_* function internally. Whenever you need a stream of
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reproducible random numbers, you better create a #GRand yourself and
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use the g_rand_* functions directly, which will also be slightly
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faster. Initializing a GRand with a certain seed will produce exactly
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the same series of random numbers on all platforms. This can thus be
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used as a seed for e.g. games.
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</para>
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<para>
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The g_rand*_range functions will return high quality equally
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distributed random numbers, whereas for example the
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<literal>(g_random_int()%%max)</literal> approach often doesn't
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yield equally distributed numbers.
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</para>
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<para>
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A random binary decision is best implemented by using
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<literal>if(g_random_int()&(1<<@a))</literal>, where @a can be every
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integer constant from 0 to 31. The Mersenne Twister PRNG is said to
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produce highly random lower bits too, but it is common not to rely on
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that, so choosing @a to be from 4 to 31 might be wise.
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</para>
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<!-- ##### STRUCT GRand ##### -->
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<para>
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The #GRand struct is an opaque data structure. It should only be
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accessed through the g_rand_* functions.
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</para>
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<!-- ##### FUNCTION g_rand_new_with_seed ##### -->
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<para>
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</para>
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@seed:
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@Returns:
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<!-- ##### FUNCTION g_rand_new ##### -->
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<para>
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</para>
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@Returns:
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<!-- ##### FUNCTION g_rand_free ##### -->
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<para>
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</para>
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@rand:
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<!-- ##### FUNCTION g_rand_set_seed ##### -->
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<para>
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</para>
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@rand:
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@seed:
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<!-- ##### FUNCTION g_rand_int ##### -->
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<para>
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</para>
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@rand:
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@Returns:
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<!-- ##### FUNCTION g_rand_int_range ##### -->
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<para>
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</para>
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@rand:
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@min:
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@max:
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@Returns:
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<!-- ##### FUNCTION g_rand_double ##### -->
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<para>
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</para>
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@rand:
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@Returns:
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<!-- ##### FUNCTION g_rand_double_range ##### -->
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<para>
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</para>
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@rand:
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@min:
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@max:
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@Returns:
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<!-- ##### FUNCTION g_random_set_seed ##### -->
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<para>
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</para>
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@seed:
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<!-- ##### FUNCTION g_random_int ##### -->
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<para>
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</para>
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@Returns:
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<!-- ##### FUNCTION g_random_int_range ##### -->
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<para>
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</para>
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@min:
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@max:
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@Returns:
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<!-- ##### FUNCTION g_random_double ##### -->
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<para>
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</para>
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@Returns:
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<!-- ##### FUNCTION g_random_double_range ##### -->
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<para>
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</para>
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@min:
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@max:
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@Returns:
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111
glib/grand.c
111
glib/grand.c
@ -64,6 +64,14 @@ struct _GRand
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guint mti;
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};
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/**
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* g_rand_new_with_seed:
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* @seed: a value to initialize the random number generator.
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*
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* Creates a new random number generator initialized with @seed.
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*
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* Return value: the new #GRand.
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**/
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GRand*
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g_rand_new_with_seed (guint32 seed)
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{
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@ -72,6 +80,15 @@ g_rand_new_with_seed (guint32 seed)
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return rand;
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}
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/**
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* g_rand_new:
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*
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* Creates a new random number generator initialized with a seed taken
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* either from /dev/urandom (if existing) or from the current time (as
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* a fallback).
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*
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* Return value: the new #GRand.
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**/
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GRand*
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g_rand_new (void)
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{
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@ -100,6 +117,12 @@ g_rand_new (void)
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return g_rand_new_with_seed (seed);
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}
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/**
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* g_rand_free:
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* @rand: a #GRand.
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*
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* Frees the memory allocated for the #GRand.
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**/
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void
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g_rand_free (GRand* rand)
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{
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@ -108,6 +131,13 @@ g_rand_free (GRand* rand)
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g_free (rand);
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}
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/**
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* g_rand_set_seed:
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* @rand: a #GRand.
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* @seed: a value to reinitialize the random number generator.
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*
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* Sets the seed for the random number generator #GRand to @seed.
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**/
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void
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g_rand_set_seed (GRand* rand, guint32 seed)
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{
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@ -126,6 +156,15 @@ g_rand_set_seed (GRand* rand, guint32 seed)
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rand->mt[rand->mti] = (69069 * rand->mt[rand->mti-1]) & 0xffffffff;
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}
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/**
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* g_rand_int:
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* @rand: a #GRand.
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*
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* Return the next random #guint32 from @rand equaly distributed over
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* the range [0..2^32-1].
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*
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* Return value: A random number.
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**/
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guint32
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g_rand_int (GRand* rand)
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{
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@ -161,6 +200,17 @@ g_rand_int (GRand* rand)
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return y;
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}
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/**
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* g_rand_int_range:
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* @rand: a #GRand.
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* @min: lower closed bound of the interval.
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* @max: upper open bound of the interval.
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*
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* Return the next random #gint32 from @rand equaly distributed over
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* the range [@min..@max-1].
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*
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* Return value: A random number.
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**/
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gint32
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g_rand_int_range (GRand* rand, gint32 min, gint32 max)
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{
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@ -215,18 +265,46 @@ g_rand_int_range (GRand* rand, gint32 min, gint32 max)
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/* transform [0..2^32-1] -> [0..1) */
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#define G_RAND_DOUBLE_TRANSFORM 2.3283064365386963e-10
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/**
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* g_rand_double:
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* @rand: a #GRand.
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*
|
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* Return the next random #gdouble from @rand equaly distributed over
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* the range [0..1).
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*
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* Return value: A random number.
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**/
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gdouble
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g_rand_double (GRand* rand)
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{
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return g_rand_int (rand) * G_RAND_DOUBLE_TRANSFORM;
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}
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/**
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* g_rand_double_range:
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* @rand: a #GRand.
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* @min: lower closed bound of the interval.
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* @max: upper open bound of the interval.
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*
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* Return the next random #gdouble from @rand equaly distributed over
|
||||
* the range [@min..@max).
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||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
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gdouble
|
||||
g_rand_double_range (GRand* rand, gdouble min, gdouble max)
|
||||
{
|
||||
return g_rand_int (rand) * ((max - min) * G_RAND_DOUBLE_TRANSFORM) + min;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_random_int:
|
||||
*
|
||||
* Return a random #guint32 equaly distributed over the range
|
||||
* [0..2^32-1].
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
guint32
|
||||
g_random_int (void)
|
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{
|
||||
@ -240,6 +318,16 @@ g_random_int (void)
|
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return result;
|
||||
}
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||||
/**
|
||||
* g_random_int_range:
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||||
* @min: lower closed bound of the interval.
|
||||
* @max: upper open bound of the interval.
|
||||
*
|
||||
* Return a random #gint32 equaly distributed over the range
|
||||
* [@min..@max-1].
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gint32
|
||||
g_random_int_range (gint32 min, gint32 max)
|
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{
|
||||
@ -253,6 +341,13 @@ g_random_int_range (gint32 min, gint32 max)
|
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return result;
|
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}
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||||
|
||||
/**
|
||||
* g_random_double:
|
||||
*
|
||||
* Return a random #gdouble equaly distributed over the range [0..1).
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gdouble
|
||||
g_random_double (void)
|
||||
{
|
||||
@ -266,6 +361,15 @@ g_random_double (void)
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return result;
|
||||
}
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|
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/**
|
||||
* g_random_double_range:
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* @min: lower closed bound of the interval.
|
||||
* @max: upper open bound of the interval.
|
||||
*
|
||||
* Return a random #gdouble equaly distributed over the range [@min..@max).
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
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gdouble
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||||
g_random_double_range (gdouble min, gdouble max)
|
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{
|
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@ -279,6 +383,13 @@ g_random_double_range (gdouble min, gdouble max)
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return result;
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}
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/**
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||||
* g_random_set_seed:
|
||||
* @seed: a value to reinitialize the global random number generator.
|
||||
*
|
||||
* Sets the seed for the global random number generator, which is used
|
||||
* by te g_random_* functions, to @seed.
|
||||
**/
|
||||
void
|
||||
g_random_set_seed (guint32 seed)
|
||||
{
|
||||
|
||||
111
grand.c
111
grand.c
@ -64,6 +64,14 @@ struct _GRand
|
||||
guint mti;
|
||||
};
|
||||
|
||||
/**
|
||||
* g_rand_new_with_seed:
|
||||
* @seed: a value to initialize the random number generator.
|
||||
*
|
||||
* Creates a new random number generator initialized with @seed.
|
||||
*
|
||||
* Return value: the new #GRand.
|
||||
**/
|
||||
GRand*
|
||||
g_rand_new_with_seed (guint32 seed)
|
||||
{
|
||||
@ -72,6 +80,15 @@ g_rand_new_with_seed (guint32 seed)
|
||||
return rand;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_rand_new:
|
||||
*
|
||||
* Creates a new random number generator initialized with a seed taken
|
||||
* either from /dev/urandom (if existing) or from the current time (as
|
||||
* a fallback).
|
||||
*
|
||||
* Return value: the new #GRand.
|
||||
**/
|
||||
GRand*
|
||||
g_rand_new (void)
|
||||
{
|
||||
@ -100,6 +117,12 @@ g_rand_new (void)
|
||||
return g_rand_new_with_seed (seed);
|
||||
}
|
||||
|
||||
/**
|
||||
* g_rand_free:
|
||||
* @rand: a #GRand.
|
||||
*
|
||||
* Frees the memory allocated for the #GRand.
|
||||
**/
|
||||
void
|
||||
g_rand_free (GRand* rand)
|
||||
{
|
||||
@ -108,6 +131,13 @@ g_rand_free (GRand* rand)
|
||||
g_free (rand);
|
||||
}
|
||||
|
||||
/**
|
||||
* g_rand_set_seed:
|
||||
* @rand: a #GRand.
|
||||
* @seed: a value to reinitialize the random number generator.
|
||||
*
|
||||
* Sets the seed for the random number generator #GRand to @seed.
|
||||
**/
|
||||
void
|
||||
g_rand_set_seed (GRand* rand, guint32 seed)
|
||||
{
|
||||
@ -126,6 +156,15 @@ g_rand_set_seed (GRand* rand, guint32 seed)
|
||||
rand->mt[rand->mti] = (69069 * rand->mt[rand->mti-1]) & 0xffffffff;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_rand_int:
|
||||
* @rand: a #GRand.
|
||||
*
|
||||
* Return the next random #guint32 from @rand equaly distributed over
|
||||
* the range [0..2^32-1].
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
guint32
|
||||
g_rand_int (GRand* rand)
|
||||
{
|
||||
@ -161,6 +200,17 @@ g_rand_int (GRand* rand)
|
||||
return y;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_rand_int_range:
|
||||
* @rand: a #GRand.
|
||||
* @min: lower closed bound of the interval.
|
||||
* @max: upper open bound of the interval.
|
||||
*
|
||||
* Return the next random #gint32 from @rand equaly distributed over
|
||||
* the range [@min..@max-1].
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gint32
|
||||
g_rand_int_range (GRand* rand, gint32 min, gint32 max)
|
||||
{
|
||||
@ -215,18 +265,46 @@ g_rand_int_range (GRand* rand, gint32 min, gint32 max)
|
||||
/* transform [0..2^32-1] -> [0..1) */
|
||||
#define G_RAND_DOUBLE_TRANSFORM 2.3283064365386963e-10
|
||||
|
||||
/**
|
||||
* g_rand_double:
|
||||
* @rand: a #GRand.
|
||||
*
|
||||
* Return the next random #gdouble from @rand equaly distributed over
|
||||
* the range [0..1).
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gdouble
|
||||
g_rand_double (GRand* rand)
|
||||
{
|
||||
return g_rand_int (rand) * G_RAND_DOUBLE_TRANSFORM;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_rand_double_range:
|
||||
* @rand: a #GRand.
|
||||
* @min: lower closed bound of the interval.
|
||||
* @max: upper open bound of the interval.
|
||||
*
|
||||
* Return the next random #gdouble from @rand equaly distributed over
|
||||
* the range [@min..@max).
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gdouble
|
||||
g_rand_double_range (GRand* rand, gdouble min, gdouble max)
|
||||
{
|
||||
return g_rand_int (rand) * ((max - min) * G_RAND_DOUBLE_TRANSFORM) + min;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_random_int:
|
||||
*
|
||||
* Return a random #guint32 equaly distributed over the range
|
||||
* [0..2^32-1].
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
guint32
|
||||
g_random_int (void)
|
||||
{
|
||||
@ -240,6 +318,16 @@ g_random_int (void)
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_random_int_range:
|
||||
* @min: lower closed bound of the interval.
|
||||
* @max: upper open bound of the interval.
|
||||
*
|
||||
* Return a random #gint32 equaly distributed over the range
|
||||
* [@min..@max-1].
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gint32
|
||||
g_random_int_range (gint32 min, gint32 max)
|
||||
{
|
||||
@ -253,6 +341,13 @@ g_random_int_range (gint32 min, gint32 max)
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_random_double:
|
||||
*
|
||||
* Return a random #gdouble equaly distributed over the range [0..1).
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gdouble
|
||||
g_random_double (void)
|
||||
{
|
||||
@ -266,6 +361,15 @@ g_random_double (void)
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_random_double_range:
|
||||
* @min: lower closed bound of the interval.
|
||||
* @max: upper open bound of the interval.
|
||||
*
|
||||
* Return a random #gdouble equaly distributed over the range [@min..@max).
|
||||
*
|
||||
* Return value: A random number.
|
||||
**/
|
||||
gdouble
|
||||
g_random_double_range (gdouble min, gdouble max)
|
||||
{
|
||||
@ -279,6 +383,13 @@ g_random_double_range (gdouble min, gdouble max)
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_random_set_seed:
|
||||
* @seed: a value to reinitialize the global random number generator.
|
||||
*
|
||||
* Sets the seed for the global random number generator, which is used
|
||||
* by te g_random_* functions, to @seed.
|
||||
**/
|
||||
void
|
||||
g_random_set_seed (guint32 seed)
|
||||
{
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user