Re^2: Distinguishing between an array of objects and an array of strings

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Re^3: Distinguishing between an array of objects and an array of strings by Zaxo (Archbishop) on Sep 22, 2005 at 11:49 UTC
ok, nobody would call their classes '0', . . . There is a good reason for that. $ perl -e'package 0' syntax error at -e line 1, near "package 0" Execution of -e aborted due to compilation errors. $ [download] Namespace names follow the same rules as variable names. After Compline, Zaxo	[reply] [d/l]
Re^4: Distinguishing between an array of objects and an array of strings by Anonymous Monk on Sep 22, 2005 at 12:41 UTC
`0` is a perfectly valid variable name. `$0` is a well known variable - and @0 and %0 are valid as well. `0` is also valid as a package name - but like many other valid package names, you can't use it as an argument to `package`.	[reply]
Re^4: Distinguishing between an array of objects and an array of strings by diotalevi (Canon) on Sep 22, 2005 at 14:31 UTC
No they don't. package declarations do, namespaces can be anything. `*{ anything } = \ anything; bless ..., anything;` [download]	[reply] [d/l]
Re^4: Distinguishing between an array of objects and an array of strings by friedo (Prior) on Sep 22, 2005 at 14:29 UTC
`my $pkg = "0"; my $o = bless { }, $pkg; print ref $o;` [download]	[reply] [d/l]
Re^3: Distinguishing between an array of objects and an array of strings by Anonymous Monk on Sep 22, 2005 at 10:45 UTC
Indeed, and unfortunally, if `$var` isn't a reference, `ref($var)` returns a false, but defined value, so testing for `defined ref($var)` is even worse than testing for `ref($var)`. However, it isn't possible to bless something into a package with no name, if the second argument of bless equals the empty string, the thing is blessed into `main. So, if ref returns anything but the empty string, its argument is a reference.`	[reply]