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compar.c
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compar.c
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/************************************************
compar.c -
$Author$
$Date$
created at: Thu Aug 26 14:39:48 JST 1993
Copyright (C) 1993-1998 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
VALUE mComparable;
static ID cmp;
static VALUE
cmp_eq(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t == 0) return TRUE;
return FALSE;
}
static VALUE
cmp_gt(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t > 0) return TRUE;
return FALSE;
}
static VALUE
cmp_ge(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t >= 0) return TRUE;
return FALSE;
}
static VALUE
cmp_lt(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t < 0) return TRUE;
return FALSE;
}
static VALUE
cmp_le(x, y)
VALUE x, y;
{
VALUE c = rb_funcall(x, cmp, 1, y);
int t = NUM2INT(c);
if (t <= 0) return TRUE;
return FALSE;
}
static VALUE
cmp_between(x, min, max)
VALUE x, min, max;
{
VALUE c = rb_funcall(x, cmp, 1, min);
int t = NUM2INT(c);
if (t < 0) return FALSE;
c = rb_funcall(x, cmp, 1, max);
t = NUM2INT(c);
if (t > 0) return FALSE;
return TRUE;
}
void
Init_Comparable()
{
mComparable = rb_define_module("Comparable");
rb_define_method(mComparable, "==", cmp_eq, 1);
rb_define_method(mComparable, ">", cmp_gt, 1);
rb_define_method(mComparable, ">=", cmp_ge, 1);
rb_define_method(mComparable, "<", cmp_lt, 1);
rb_define_method(mComparable, "<=", cmp_le, 1);
rb_define_method(mComparable, "between?", cmp_between, 2);
cmp = rb_intern("<=>");
}