comment on

function_name indirect_object argument... rather then function_name argument operator...

No, the message would be different if that was the case

$ perl -le" ro sham bo  "
Can't locate object method "ro" via package "sham" (perhaps you forgot
+ to load "sham"?) at -e line 1.
[download]

Its just never going to work the way the OP thinks it should (or I think he thinks it should)

An anonymous subroutine is always defined

$ perl -MO=Deparse -e "  sub foo (&) {}; foo sub{;;}   || 7 "
Type of arg 1 to main::foo must be block or sub {} (not null operation
+) at -e line 1, at EOF
-e had compilation errors.
sub foo (&) {

}
&foo(sub {

}
 || 7);

$ perl -MO=Deparse -e "  sub foo (&) {}; foo sub{;;}   // 7 "
Type of arg 1 to main::foo must be block or sub {} (not null operation
+) at -e line 1, at EOF
-e had compilation errors.
sub foo (&) {

}
&foo(sub {

}
 // 7);
[download]

So you can see there is no indirect object notation

Its anonymous sub, match operator, and a seven, and these three scalars/expressions need to be separated by operators, like comma, plus minus ...

$ perl -MO=Deparse -e "  sub foo (&) {}; foo {;;}   // 7 "
Number found where operator expected at -e line 1, near "// 7"
        (Missing operator before  7?)
Too many arguments for main::foo at -e line 1, near "// 7"
syntax error at -e line 1, near "// 7"
-e had compilation errors.
sub foo (&) {

}

$ perl -e " // 1 "
Number found where operator expected at -e line 1, near "// 1"
        (Missing operator before  1?)
syntax error at -e line 1, near "// 1"
Execution of -e aborted due to compilation errors.



$ perl -le "  sub foo (&) {}; foo sub{;;}   +// 7 "
Number found where operator expected at -e line 1, near "// 7"
        (Missing operator before  7?)
Type of arg 1 to main::foo must be block or sub {} (not addition (+)) 
+at -e line 1, near "// 7"
syntax error at -e line 1, near "// 7"
Execution of -e aborted due to compilation errors.

$ perl -le "  sub foo (&) {}; foo sub{;;}   +//, 7 "
Type of arg 1 to main::foo must be block or sub {} (not addition (+)) 
+at -e line 1, at EOF
Too many arguments for main::foo at -e line 1, at EOF
Execution of -e aborted due to compilation errors.

$ perl -le "  sub foo (&) {}; foo sub{;;}   ,//, 7 "
Too many arguments for main::foo at -e line 1, at EOF
Execution of -e aborted due to compilation errors.
[download]

Now you could argue it should just work, how come it recognizes three scalar expressions instead of recognizing one of them as an operator.... but its moot, the perlops || and // bind tight, there really is no avoiding the parenthesis :)

$ perl -le "  sub foo (&) {shift->()}; print 1, do{foo {rand}} // 7 "
10.762115478515625

$ perl -le "  sub foo (&) {shift->()}; print 1, do{foo {}} // 7 "
17
[download]

In reply to Re^2: strangeness with prototypes and 'logical defined or'? by Anonymous Monk
in thread strangeness with prototypes and 'logical defined or'? by ed_hoch

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		`&`
	<		`<`
	>		`>`
	[		`[`
	]		`]`

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.