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name : Trace.pm
 #!perl

package Math::BigFloat::Trace;

require 5.010;
use strict;
use warnings;

use Exporter;
use Math::BigFloat;

our ($accuracy, $precision, $round_mode, $div_scale);

our @ISA = qw(Exporter Math::BigFloat);

our $VERSION = '0.49';

use overload;                   # inherit overload from Math::BigFloat

# Globals
$accuracy = $precision = undef;
$round_mode = 'even';
$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 $self = Math::BigFloat->new($value, $a, $p, $round_mode);

    # remember, downgrading may return a BigInt, so don't meddle with class
    # bless $self, $class;

    print "MBF new '$value' => '$self' (", ref($self), ")";
    return $self;
}

sub import {
    print "MBF import ", join(' ', @_);
    my $self = shift;

    # we catch the constants, the rest goes go BigFloat
    my @a = ();
    foreach (@_) {
        push @a, $_ if $_ ne ':constant';
    }
    overload::constant float => sub { $self->new(shift); };

    Math::BigFloat->import(@a);                 # need it for subclasses
#    $self->export_to_level(1,$self,@_);         # need this ?
}

1;
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