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Hi Rado,

All current iRules versions are based on TCL 8.4. TCL 8.4 supports a max integer of 2^63:

From http://en.wikibooks.org/wiki/Tcl_Programming/Introduction

The maximal positive integer can be determined from the hexadecimal form, with a 7 in front, and else all Fs. Tcl from 8.4 can use "wide integers" of 64 bits, and the maximum integer there is

% expr 0x7fffffffffffffff

9223372036854775807

Demonstration: one more, and it turns into the minimum integer:

% expr 0x8000000000000000

-9223372036854775808

Bignums: from Tcl 8.5, integers can be of arbitrary size, so there is no maximum integer anymore. Say, you want a big factorial:

% proc tcl::mathfunc::fac x {expr {$x < 2? 1: $x * fac($x-1)}}

% expr fac(100)

93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

when RULE_INIT {
   log local0. "\[expr 0x7fffffffffffffff\]: [expr 0x7fffffffffffffff]"
   log local0. "\[expr 0x8000000000000000\]: [expr 0x8000000000000000]"
}

: [expr 0x7fffffffffffffff]: 9223372036854775807

: [expr 0x8000000000000000]: -9223372036854775808

Aaron