Initial Commit

database/perl/lib/Math/BigFloat/Trace.pm

@@ -0,0 +1,58 @@
+#!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 $VERSION = '0.51';
+
+use overload;                   # inherit overload from Math::BigFloat
+
+# Globals
+$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;