# NAME
Math::BigInt::Lite - What Math::BigInts are before they become big
# SYNOPSIS
use Math::BigInt::Lite;
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)
# DESCRIPTION
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 library
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';
use Math::BigInt::Lite;
you can roll it all into one line:
use Math::BigInt::Lite lib => 'GMP';
Use the lib, Luke!
## Using Lite as substitute for Math::BigInt
The pragmas [bigrat](https://metacpan.org/pod/bigrat), [bignum](https://metacpan.org/pod/bignum) and [bigint](https://metacpan.org/pod/bigint) will automatically use
Math::BigInt::Lite whenever possible.
# METHODS
## new
$x = Math::BigInt::Lite->new('1');
Create a new Math::BigInt:Lite object. When the input is not of an suitable
simple and small form, an object of the class of `$upgrade` (typically
Math::BigInt) will be returned.
All other methods from BigInt and BigFloat should work as expected.
# BUGS
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](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.
# SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Math::BigInt::Lite
You can also look for information at:
- GitHub
[https://github.com/pjacklam/p5-Math-BigInt](https://github.com/pjacklam/p5-Math-BigInt)
- RT: CPAN's request tracker
[https://rt.cpan.org/Dist/Display.html?Name=Math-BigInt](https://rt.cpan.org/Dist/Display.html?Name=Math-BigInt)
- MetaCPAN
[https://metacpan.org/release/Math-BigInt](https://metacpan.org/release/Math-BigInt)
- CPAN Testers Matrix
[http://matrix.cpantesters.org/?dist=Math-BigInt](http://matrix.cpantesters.org/?dist=Math-BigInt)
- CPAN Ratings
[https://cpanratings.perl.org/dist/Math-BigInt](https://cpanratings.perl.org/dist/Math-BigInt)
# LICENSE
This program is free software; you may redistribute it and/or modify it under
the same terms as Perl itself.
# SEE ALSO
[Math::BigFloat](https://metacpan.org/pod/Math%3A%3ABigFloat) and [Math::BigInt](https://metacpan.org/pod/Math%3A%3ABigInt) as well as
[Math::BigInt::Pari](https://metacpan.org/pod/Math%3A%3ABigInt%3A%3APari) and [Math::BigInt::GMP](https://metacpan.org/pod/Math%3A%3ABigInt%3A%3AGMP).
The [bignum](https://metacpan.org/pod/bignum) module.
# AUTHORS
- Copyright 2002-2007 Tels, [http://bloodgate.com](http://bloodgate.com).
- Copyright 2010 Florian Ragwitz .
- Copyright 2016- Peter John Acklam .