NAME

Scalar::Util::Numeric - numeric tests for Perl datatypes

SYNOPSIS

    use Scalar::Util::Numeric qw(isnum isint isfloat);

    foo($bar / 2) if (isnum $bar);

    if (isint $baz) {
        # ...
    } elsif (isfloat $baz) {
        # ...
    }

DESCRIPTION

This module exports a number of wrappers around perl's builtin looks_like_number function, which returns the numeric type of its argument, or 0 if it isn't numeric.

TAGS

All of the functions exported by Scalar::Util::Numeric can be imported by using the :all tag:

        use Scalar::Util::Numeric qw(:all);

isnum

usage

    isnum ($val)

description

Returns a nonzero value (indicating the numeric type) if $val is a number.

The numeric type is a conjunction of the following flags:

    0x01  IS_NUMBER_IN_UV               (number within UV range - not necessarily an integer)
    0x02  IS_NUMBER_GREATER_THAN_UV_MAX (number is greater than UV_MAX)
    0x04  IS_NUMBER_NOT_INT             (saw . or E notation)
    0x08  IS_NUMBER_NEG                 (leading minus sign)
    0x10  IS_NUMBER_INFINITY            (Infinity)
    0x20  IS_NUMBER_NAN                 (NaN - not a number)

The following flavours of isnum (corresponding to the flags above) are also available:

    isint
    isuv
    isbig
    isfloat
    isneg
    isinf
    isnan

isint returns -1 if its operand is a negative integer, 1 if it's 0 or a positive integer, and 0 otherwise.

The others always return 1 or 0.

SEE ALSO

Scalar::Util

AUTHOR

chocolateboy: <chocolate.boy@email.com>

COPYRIGHT

Copyright (c) 2005, chocolateboy.

This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself.