1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
# -*- mode: perl; -*-
package Math::BigRat::Trace;
use strict;
use warnings;
use Exporter;
use Math::BigRat;
our @ISA = qw(Exporter Math::BigRat);
our $VERSION = '0.67';
use overload; # inherit overload from Math::BigRat
# Globals
our $accuracy = undef;
our $precision = undef;
our $round_mode = 'even';
our $div_scale = 40;
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my $value = shift;
my $a = $accuracy;
$a = $_[0] if defined $_[0];
my $p = $precision;
$p = $_[1] if defined $_[1];
my $self = $class -> SUPER::new($value, $a, $p, $round_mode);
printf "Math::BigRat new '%s' => '%s' (%s)\n",
$value, $self, ref($self);
return $self;
}
sub import {
my $class = shift;
printf "%s -> import(%s)\n", $class, join(", ", @_);
# we catch the constants, the rest goes to parent
my $constant = grep { $_ eq ':constant' } @_;
my @a = grep { $_ ne ':constant' } @_;
if ($constant) {
overload::constant
integer => sub {
$class -> new(shift);
},
float => sub {
$class -> new(shift);
},
binary => sub {
# E.g., a literal 0377 shall result in an object whose value
# is decimal 255, but new("0377") returns decimal 377.
return $class -> from_oct($_[0]) if $_[0] =~ /^0_*[0-7]/;
$class -> new(shift);
};
}
$class -> SUPER::import(@a); # need it for subclasses
#$self -> export_to_level(1, $class, @_); # need this ?
}
1;
|
