Re: [Boost-build] Generating random number string in b2

Subject: Re: [Boost-build] Generating random number string in b2
From: Edward Diener (eldiener_at_[hidden])
Date: 2016-10-10 17:17:30

On 10/10/2016 4:31 PM, Ryan Gonzalez wrote:
> FWIW, I just wrote a module for random numbers, because I'm a horrible
> sadist (only works on Unix system, BTW, and not Solaris):
>
>
> import "class" : new ;
> import numbers ;
> import regex ;
>
> local rule time ( ) {
>     local time = [ SPLIT_BY_CHARACTERS [ SHELL "date +%s%3N" ] : "\n" ] ;
>     return $(time[0]) ;
> }
>
> local rule mul ( a b ) {
>     local res = 0 ;
>     for local _ in [ numbers.range 1 $(b) ] {
>         res = [ CALC $(res) + $(a) ] ;
>     }
>     return $(res) ;
> }
>
> local rule mod ( a b ) {
>     while [ numbers.less $(b) $(a) ] {
>         a = [ CALC $(a) - $(b) ] ;
>     }
>     return $(a) ;
> }
>
> local rule trimtime ( time ) {
>     return [ regex.match "(.....|....|...|..|.)$" : $(time) : 1 ] ;
> }
>
> local rule tostate ( x ) { return [ mod $(x) 101 ] ; }
>
> state = [ tostate [ trimtime [ time ] ] ] ;
>
> rule random ( ) {
>     state = [ tostate [ mul $(state) 7 ] ] ;
>     return [ CALC $(state) - 1 ] ;
> }

Neat. There may be shell commands on Windows and/or other OSs which 
return something random, like the date and time in some sort of a 
string format.

>
>
> On Mon, Oct 10, 2016 at 10:07 AM, Edward Diener <eldiener_at_[hidden]
> <mailto:eldiener_at_[hidden]>> wrote:
>
>     Is there a way to generate a random number string in b2 ?
>
>     I have a rule which may be invoked more than once with the same
>     parameters from a jam file. The rule creates build targets based on
>     the parameters and I need to give each build target a unique name.
>     Of course it would be nice if the end-user invoked the rule with the
>     same parameters only once in a jamfile and saved the result in a
>     local variable but I cannot force that usage. Therefore I want to
>     generate a uniquely named build target even when the parameters to
>     the rule are the same. I am using configure.builds with the build
>     target so as long as my uniquely named build target matches what is
>     passed to configure.builds I am OK.
>
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>
>
>
> --
> Ryan
> [ERROR]: Your autotools build scripts are 200 lines longer than your
> program. Something’s wrong.
> http://kirbyfan64.github.io/