Re: defining constant in other package

As a side issue, I would always prefer to see Readonly rather than constant. The resulting structure is syntactically a variable rather than a function. The biggest advantage is that it interpolates in a string the same as any other variable.

Comment on Re: defining constant in other package

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Re^2: defining constant in other package by LanX (Saint) on Apr 24, 2012 at 22:44 UTC
Readonly can be used for constant folding? Cheers Rolf	[reply]
Re^3: defining constant in other package by BillKSmith (Monsignor) on Apr 24, 2012 at 23:25 UTC
I am not sure what you mean by "constant folding." Perl ensures that "variables" marked as readonly cannot be used as l-values. I doubt that they are special in any other way.	[reply]
Re^4: defining constant in other package by Jenda (Abbot) on Apr 25, 2012 at 08:16 UTC
`C:\Users\jenda>perl -MO=Deparse -e "print 1+2" print 3; -e syntax OK C:\Users\jenda>perl -MO=Deparse -e "use constant ONE => 1; print ONE+2 +" use constant ('ONE', 1); print 3; -e syntax OK C:\Users\jenda>perl -MO=Deparse -e "sub ONE () {1}; print ONE+2" sub ONE () { 1 } print 3; -e syntax OK C:\Users\jenda>perl -MO=Deparse -e "use Readonly; Readonly $ONE => 1; +print $ONE+2" use Readonly; Readonly $ONE, 1; print $ONE + 2; -e syntax OK` [download] See Constant folding. Apparently Readonly is not constant enough. So no constant folding, not unreachable code removal, ... Jenda Enoch was right! Enjoy the last years of Rome.	[reply] [d/l]