# 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, bignum and 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 (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:

RT: CPAN's request tracker

https://rt.cpan.org/Public/Dist/Display.html?Name=Math-BigInt-Lite

AnnoCPAN: Annotated CPAN documentation

CPAN Ratings

Search CPAN

CPAN Testers Matrix

# 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 and Math::Big as well as Math::BigInt::Pari and Math::BigInt::GMP.

The bignum module.

# AUTHORS

Copyright 2002-2007 Tels, http://bloodgate.com.

Copyright 2010 Florian Ragwitz flora@cpan.org.

Copyright 2016- Peter John Acklam pjacklam@online.no.