Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Re^2: Contents of @_ using subroutine signatures with default values

by LanX (Sage)
on Jul 14, 2020 at 13:01 UTC ( #11119300=note: print w/replies, xml ) Need Help??


in reply to Re: Contents of @_ using subroutine signatures with default values (not a bug)
in thread Contents of @_ using subroutine signatures with default values

a more sophisticated test, covering errors too
# https://perlmonks.org/?node_id=11119273 use strict; use warnings; use feature qw(signatures); no warnings qw(experimental::signatures); use B::Deparse; use Test::More; sub foo ($this, $that='bar') { return scalar @_; } t_foo(0,undef,'Too few arguments'); t_foo(1,1,"One arg"); t_foo(2,2,"Two args"); t_foo(3,undef,"Too many arguments"); done_testing(); sub t_foo { my ($n_args, $exp, $desc ) = @_; my @args = ("","a".."z")[1..$n_args]; my $code = "foo(qw/@args/)"; my $got = eval $code; unless ($@) { is( $got, $exp, "<$code> \t $desc: \@_ == $got" ); } else { ok( $@ =~ $desc, "<$code> \t ERR: $desc: "); } } #diag "Show sig implementation:\n", B::Deparse->new()->coderef2text(\& +foo);

C:/Perl_524/bin\perl.exe -w d:/exp/pm_signatures.pl ok 1 - <foo(qw//)> ERR: Too few arguments: ok 2 - <foo(qw/a/)> One arg: @_ == 1 ok 3 - <foo(qw/a b/)> Two args: @_ == 2 ok 4 - <foo(qw/a b c/)> ERR: Too many arguments: 1..4

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://11119300]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (3)
As of 2021-10-26 11:57 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My first memorable Perl project was:







    Results (90 votes). Check out past polls.

    Notices?