package bigrat;
-use 5.006002;
+use 5.006;
-$VERSION = '0.22';
+$VERSION = '0.23';
require Exporter;
-@ISA = qw( Exporter );
-@EXPORT_OK = qw( );
-@EXPORT = qw( inf NaN );
+@ISA = qw( bigint );
+@EXPORT_OK = qw( PI e bpi bexp );
+@EXPORT = qw( inf NaN );
use strict;
use overload;
+require bigint; # no "use" to avoid callind import
##############################################################################
+BEGIN
+ {
+ *inf = \&bigint::inf;
+ *NaN = \&bigint::NaN;
+ }
+
# These are all alike, and thus faked by AUTOLOAD
my @faked = qw/round_mode accuracy precision div_scale/;
Carp::croak ("Can't call bigrat\-\>$name, not a valid method");
}
-sub upgrade
- {
- $Math::BigInt::upgrade;
- }
-
-sub _binary_constant
- {
- # this takes a binary/hexadecimal/octal constant string and returns it
- # as string suitable for new. Basically it converts octal to decimal, and
- # passes every thing else unmodified back.
- my $string = shift;
-
- return Math::BigInt->new($string) if $string =~ /^0[bx]/;
-
- # so it must be an octal constant
- Math::BigInt->from_oct($string);
- }
-
sub unimport
{
$^H{bigrat} = undef; # no longer in effect
$hinthash->{bigrat};
}
+#############################################################################
+# the following two routines are for Perl 5.9.4 or later and are lexical
+
+sub _hex
+ {
+ return CORE::hex($_[0]) unless in_effect(1);
+ my $i = $_[0];
+ $i = '0x'.$i unless $i =~ /^0x/;
+ Math::BigInt->new($i);
+ }
+
+sub _oct
+ {
+ return CORE::oct($_[0]) unless in_effect(1);
+ my $i = $_[0];
+ return Math::BigInt->from_oct($i) if $i =~ /^0[0-7]/;
+ Math::BigInt->new($i);
+ }
+
sub import
{
my $self = shift;
$^H{bigrat} = 1; # we are in effect
+ my ($hex,$oct);
+ # for newer Perls always override hex() and oct() with a lexical version:
+ if ($] > 5.009004)
+ {
+ $oct = \&_oct;
+ $hex = \&_hex;
+ }
# some defaults
my $lib = ''; my $lib_kind = 'try'; my $upgrade = 'Math::BigFloat';
$trace = 1;
splice @a, $j, 1; $j --;
}
- else
+ elsif ($_[$i] eq 'hex')
+ {
+ splice @a, $j, 1; $j --;
+ $hex = \&bigint::_hex_global;
+ }
+ elsif ($_[$i] eq 'oct')
+ {
+ splice @a, $j, 1; $j --;
+ $oct = \&bigint::_oct_global;
+ }
+ elsif ($_[$i] !~ /^(PI|e|bpi|bexp)\z/)
{
die ("unknown option $_[$i]");
}
}
# Take care of octal/hexadecimal constants
- overload::constant binary => sub { _binary_constant(shift) };
+ overload::constant binary => sub { bigint::_binary_constant(shift) };
# if another big* was already loaded:
my ($package) = caller();
{
$self->export_to_level(1,$self,@a); # export inf and NaN
}
+ {
+ no warnings 'redefine';
+ *CORE::GLOBAL::oct = $oct if $oct;
+ *CORE::GLOBAL::hex = $hex if $hex;
+ }
}
-sub inf () { Math::BigInt->binf(); }
-sub NaN () { Math::BigInt->bnan(); }
+sub PI () { Math::BigFloat->new('3.141592653589793238462643383279502884197'); }
+sub e () { Math::BigFloat->new('2.718281828459045235360287471352662497757'); }
+
+sub bpi ($) { local $Math::BigFloat::upgrade; Math::BigFloat::bpi(@_); }
+
+sub bexp ($$)
+ {
+ local $Math::BigFloat::upgrade;
+ my $x = Math::BigFloat->new($_[0]); $x->bexp($_[1]);
+ }
1;
print 1/3,"\n"; # 0.33333...
}
+ # Note that this will make hex() and oct() be globally overriden:
+ use bigrat qw/hex oct/;
+ print hex("0x1234567890123490"),"\n";
+ print oct("01234567890123490"),"\n";
+
=head1 DESCRIPTION
All operators (including basic math operations) are overloaded. Integer and
A shortcut to return Math::BigInt->bnan(). Useful because Perl does not always
handle bareword C<NaN> properly.
+=item e
+
+ # perl -Mbigrat=e -wle 'print e'
+
+Returns Euler's number C<e>, aka exp(1).
+
+=item PI
+
+ # perl -Mbigrat=PI -wle 'print PI'
+
+Returns PI.
+
+=item bexp()
+
+ bexp($power,$accuracy);
+
+
+Returns Euler's number C<e> raised to the appropriate power, to
+the wanted accuracy.
+
+Example:
+
+ # perl -Mbigrat=bexp -wle 'print bexp(1,80)'
+
+=item bpi()
+
+ bpi($accuracy);
+
+Returns PI to the wanted accuracy.
+
+Example:
+
+ # perl -Mbigrat=bpi -wle 'print bpi(80)'
+
=item upgrade()
Return the class that numbers are upgraded to, is in fact returning
This will be hopefully fixed soon ;)
+=item hex
+
+Override the built-in hex() method with a version that can handle big
+integers. Note that under Perl v5.9.4 or ealier, this will be global
+and cannot be disabled with "no bigint;".
+
+=item oct
+
+Override the built-in oct() method with a version that can handle big
+integers. Note that under Perl v5.9.4 or ealier, this will be global
+and cannot be disabled with "no bigint;".
+
=item v or version
This prints out the name and version of all modules used and then exits.
=back
+=head1 CAVAETS
+
+=over 2
+
+=item in_effect()
+
+This method only works on Perl v5.9.4 or later.
+
+=item hex()/oct()
+
+C<bigint> overrides these routines with versions that can also handle
+big integer values. Under Perl prior to version v5.9.4, however, this
+will not happen unless you specifically ask for it with the two
+import tags "hex" and "oct" - and then it will be global and cannot be
+disabled inside a scope with "no bigint":
+
+ use bigint qw/hex oct/;
+
+ print hex("0x1234567890123456");
+ {
+ no bigint;
+ print hex("0x1234567890123456");
+ }
+
+The second call to hex() will warn about a non-portable constant.
+
+Compare this to:
+
+ use bigint;
+
+ # will warn only under Perl older than v5.9.4
+ print hex("0x1234567890123456");
+
+=back
+
=head1 EXAMPLES
perl -Mbigrat -le 'print sqrt(33)'
https://perl5.git.perl.org / perl5.git / blobdiff