Math::BigInt::Lite - What Math::BigInts are before they become big
my $x = Math::BigInt::Lite->new(1);
print $x->bstr(), "\n"; # 1
$x = Math::BigInt::Lite->new('1e1234');
print $x->bsstr(), "\n"; # 1e1234 (silently upgrades to
Math::BigInt is not very good suited to work with small (read: typical less than 10 digits) numbers, since it has a quite high per-operation overhead and is thus much slower than normal Perl for operations like:
my $x = 1 + 2; # fast and correct
my $x = 2 ** 256; # fast, but wrong
my $x = Math::BigInt->new(1) + 2; # slow, but correct
my $x = Math::BigInt->new(2) ** 256; # slow, and still correct
But for some applications, you want fast speed for small numbers without the risk of overflowing.
This is were Math::BigInt::Lite comes into play.
Math::BigInt::Lite objects should behave in every way like Math::BigInt objects, that is apart from the different label, you should not be able to tell the difference. Since Math::BigInt::Lite is designed with speed in mind, there are certain limitations build-in. In praxis, however, you will not feel them, because everytime something gets to big to pass as Lite (literally), it will upgrade the objects and operation in question to Math::BigInt.
Math with the numbers is done (by default) by a module called Math::BigInt::Calc. This is equivalent to saying:
use Math::BigInt::Lite lib => 'Calc';
You can change this by using:
use Math::BigInt::Lite lib => 'GMP';
The following would first try to find Math::BigInt::Foo, then Math::BigInt::Bar, and when this also fails, revert to Math::BigInt::Calc:
use Math::BigInt::Lite lib => 'Foo,Math::BigInt::Bar';
See the respective low-level math library documentation for further details.
Please note that Math::BigInt::Lite does not use the denoted library itself, but it merely passes the lib argument to Math::BigInt. So, instead of the need to do:
use Math::BigInt lib => 'GMP';
you can roll it all into one line:
Use the lib, Luke!
$x = Math::BigInt::Lite->new('1');
Create a new Math::BigInt:Lite object. When the input is not of an suitable simple and small form, an object of the class of $upgrade (typically Math::BigInt) will be returned.
All other methods from BigInt and BigFloat should work as expected.
Please report any bugs or feature requests to bug-math-bigint at rt.cpan.org, or through the web interface at https://rt.cpan.org/Ticket/Create.html?Queue=Math-BigInt-Lite (requires login). We will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
bug-math-bigint at rt.cpan.org
You can find documentation for this module with the perldoc command.
You can also look for information at:
RT: CPAN's request tracker
CPAN Testers Matrix
This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
Math::BigFloat and Math::BigInt as well as Math::BigInt::Pari and Math::BigInt::GMP.
The bignum module.
Copyright 2002-2007 Tels, http://bloodgate.com.
Copyright 2010 Florian Ragwitz <firstname.lastname@example.org>.
Copyright 2016- Peter John Acklam <email@example.com>.
To install Math::BigInt::Lite, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.