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a48d60b1c0
with the versions in this module using scm_c_extend_primitive_generic. * goops.scm (equal?): Define default method. * goops.c (scm_primitive_generic_generic): Enable primitive generic if not enabled. (scm_sys_goops_loaded): Setup unextended primitive generics. * goops.c, goops.h (scm_c_extend_primitive_generic): New function. * snarf.h (SCM_PRIMITIVE_GENERIC, SCM_PRIMITIVE_GENERIC_1): New snarf macros. * numbers.c (scm_abs): Use SCM_PRIMITIVE_GENERIC. (This is only a testing example. All uses of SCM_GPROC should be converted.) * procprop.c (scm_stand_in_scm_proc): Use scm_assq instead of scm_assoc. * eq.c (scm_equal_p): Turned into a primitive generic.
235 lines
7.1 KiB
C
235 lines
7.1 KiB
C
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2003 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "libguile/_scm.h"
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#include "libguile/ramap.h"
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#include "libguile/stackchk.h"
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#include "libguile/strorder.h"
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#include "libguile/async.h"
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#include "libguile/root.h"
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#include "libguile/smob.h"
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#include "libguile/unif.h"
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#include "libguile/vectors.h"
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#include "libguile/validate.h"
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#include "libguile/eq.h"
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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SCM_DEFINE1 (scm_eq_p, "eq?", scm_tc7_rpsubr,
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(SCM x, SCM y),
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"Return @code{#t} iff @var{x} references the same object as @var{y}.\n"
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"@code{eq?} is similar to @code{eqv?} except that in some cases it is\n"
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"capable of discerning distinctions finer than those detectable by\n"
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"@code{eqv?}.")
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#define FUNC_NAME s_scm_eq_p
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{
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return SCM_BOOL (SCM_EQ_P (x, y));
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}
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#undef FUNC_NAME
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/* We compare doubles in a special way for 'eqv?' to be able to
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distinguish plus and minus zero and to identify NaNs.
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*/
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static int
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real_eqv (double x, double y)
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{
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return !memcmp (&x, &y, sizeof(double));
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}
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SCM_DEFINE1 (scm_eqv_p, "eqv?", scm_tc7_rpsubr,
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(SCM x, SCM y),
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"The @code{eqv?} procedure defines a useful equivalence relation on objects.\n"
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"Briefly, it returns @code{#t} if @var{x} and @var{y} should normally be\n"
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"regarded as the same object. This relation is left slightly open to\n"
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"interpretation, but works for comparing immediate integers, characters,\n"
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"and inexact numbers.")
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#define FUNC_NAME s_scm_eqv_p
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{
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if (SCM_EQ_P (x, y))
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return SCM_BOOL_T;
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if (SCM_IMP (x))
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return SCM_BOOL_F;
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if (SCM_IMP (y))
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return SCM_BOOL_F;
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/* this ensures that types and scm_length are the same. */
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if (SCM_CELL_TYPE (x) != SCM_CELL_TYPE (y))
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{
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/* treat mixes of real and complex types specially */
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if (SCM_SLOPPY_INEXACTP (x))
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{
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if (SCM_SLOPPY_REALP (x))
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return SCM_BOOL (SCM_SLOPPY_COMPLEXP (y)
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&& real_eqv (SCM_REAL_VALUE (x),
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SCM_COMPLEX_REAL (y))
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&& 0.0 == SCM_COMPLEX_IMAG (y));
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else
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return SCM_BOOL (SCM_SLOPPY_REALP (y)
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&& real_eqv (SCM_COMPLEX_REAL (x),
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SCM_REAL_VALUE (y))
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&& SCM_COMPLEX_IMAG (x) == 0.0);
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}
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return SCM_BOOL_F;
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}
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if (SCM_NUMP (x))
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{
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if (SCM_BIGP (x)) {
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return SCM_BOOL (0 == scm_bigcomp (x, y));
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} else if (SCM_SLOPPY_REALP (x)) {
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return SCM_BOOL (real_eqv (SCM_REAL_VALUE (x), SCM_REAL_VALUE (y)));
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} else { /* complex */
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return SCM_BOOL (real_eqv (SCM_COMPLEX_REAL (x),
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SCM_COMPLEX_REAL (y))
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&& real_eqv (SCM_COMPLEX_IMAG (x),
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SCM_COMPLEX_IMAG (y)));
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}
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}
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return SCM_BOOL_F;
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}
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#undef FUNC_NAME
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SCM_PRIMITIVE_GENERIC_1 (scm_equal_p, "equal?", scm_tc7_rpsubr,
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(SCM x, SCM y),
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"Return @code{#t} iff @var{x} and @var{y} are recursively @code{eqv?} equivalent.\n"
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"@code{equal?} recursively compares the contents of pairs,\n"
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"vectors, and strings, applying @code{eqv?} on other objects such as\n"
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"numbers and symbols. A rule of thumb is that objects are generally\n"
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"@code{equal?} if they print the same. @code{equal?} may fail to\n"
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"terminate if its arguments are circular data structures.")
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#define FUNC_NAME s_scm_equal_p
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{
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SCM_CHECK_STACK;
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tailrecurse:
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SCM_TICK;
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if (SCM_EQ_P (x, y))
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return SCM_BOOL_T;
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if (SCM_IMP (x))
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return SCM_BOOL_F;
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if (SCM_IMP (y))
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return SCM_BOOL_F;
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if (SCM_CONSP (x) && SCM_CONSP (y))
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{
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if (SCM_FALSEP (scm_equal_p (SCM_CAR (x), SCM_CAR (y))))
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return SCM_BOOL_F;
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x = SCM_CDR(x);
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y = SCM_CDR(y);
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goto tailrecurse;
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}
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if (SCM_TYP7S (x) == scm_tc7_string && SCM_TYP7S (y) == scm_tc7_string)
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return scm_string_equal_p (x, y);
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/* This ensures that types and scm_length are the same. */
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if (SCM_CELL_TYPE (x) != SCM_CELL_TYPE (y))
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{
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/* treat mixes of real and complex types specially */
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if (SCM_SLOPPY_INEXACTP (x))
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{
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if (SCM_SLOPPY_REALP (x))
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return SCM_BOOL (SCM_SLOPPY_COMPLEXP (y)
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&& SCM_REAL_VALUE (x) == SCM_COMPLEX_REAL (y)
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&& 0.0 == SCM_COMPLEX_IMAG (y));
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else
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return SCM_BOOL (SCM_SLOPPY_REALP (y)
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&& SCM_COMPLEX_REAL (x) == SCM_REAL_VALUE (y)
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&& SCM_COMPLEX_IMAG (x) == 0.0);
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}
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return SCM_BOOL_F;
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}
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switch (SCM_TYP7 (x))
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{
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default:
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break;
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case scm_tc7_vector:
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case scm_tc7_wvect:
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return scm_vector_equal_p (x, y);
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case scm_tc7_smob:
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{
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int i = SCM_SMOBNUM (x);
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if (!(i < scm_numsmob))
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return SCM_BOOL_F;
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if (scm_smobs[i].equalp)
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return (scm_smobs[i].equalp) (x, y);
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else
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break;
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}
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#ifdef HAVE_ARRAYS
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case scm_tc7_bvect: case scm_tc7_uvect: case scm_tc7_ivect:
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case scm_tc7_fvect: case scm_tc7_cvect: case scm_tc7_dvect:
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case scm_tc7_svect:
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#ifdef HAVE_LONG_LONGS
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case scm_tc7_llvect:
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#endif
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case scm_tc7_byvect:
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if (scm_tc16_array && scm_smobs[SCM_TC2SMOBNUM (scm_tc16_array)].equalp)
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return scm_array_equal_p (x, y);
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#endif
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}
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if (SCM_UNPACK (g_scm_equal_p))
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return scm_call_generic_2 (g_scm_equal_p, x, y);
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else
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return SCM_BOOL_F;
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}
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#undef FUNC_NAME
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void
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scm_init_eq ()
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{
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#include "libguile/eq.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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