晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/perl5/vendor_perl/Math/BigFloat/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;

haha - 2025