| 1 | #!/usr/bin/perl -w |
| 2 | |
| 3 | package Math::BigFloat::Trace; |
| 4 | |
| 5 | require 5.005_02; |
| 6 | use strict; |
| 7 | |
| 8 | use Exporter; |
| 9 | use Math::BigFloat; |
| 10 | use vars qw($VERSION @ISA $PACKAGE @EXPORT_OK |
| 11 | $accuracy $precision $round_mode $div_scale); |
| 12 | |
| 13 | @ISA = qw(Exporter Math::BigFloat); |
| 14 | |
| 15 | $VERSION = 0.01; |
| 16 | |
| 17 | use overload; # inherit overload from BigFloat |
| 18 | |
| 19 | # Globals |
| 20 | $accuracy = $precision = undef; |
| 21 | $round_mode = 'even'; |
| 22 | $div_scale = 40; |
| 23 | |
| 24 | sub new |
| 25 | { |
| 26 | my $proto = shift; |
| 27 | my $class = ref($proto) || $proto; |
| 28 | |
| 29 | my $value = shift; |
| 30 | my $a = $accuracy; $a = $_[0] if defined $_[0]; |
| 31 | my $p = $precision; $p = $_[1] if defined $_[1]; |
| 32 | my $self = Math::BigFloat->new($value,$a,$p,$round_mode); |
| 33 | |
| 34 | # remember, downgrading may return a BigInt, so don't meddle with class |
| 35 | # bless $self,$class; |
| 36 | |
| 37 | print "MBF new '$value' => '$self' (",ref($self),")"; |
| 38 | return $self; |
| 39 | } |
| 40 | |
| 41 | sub import |
| 42 | { |
| 43 | print "MBF import ",join(' ',@_); |
| 44 | my $self = shift; |
| 45 | |
| 46 | # we catch the constants, the rest goes go BigFloat |
| 47 | my @a = (); |
| 48 | foreach (@_) |
| 49 | { |
| 50 | push @a, $_ if $_ ne ':constant'; |
| 51 | } |
| 52 | overload::constant float => sub { $self->new(shift); }; |
| 53 | |
| 54 | Math::BigFloat->import(@a); # need it for subclasses |
| 55 | # $self->export_to_level(1,$self,@_); # need this ? |
| 56 | } |
| 57 | |
| 58 | 1; |