Re^2: Odd convention? (fall-back module in BEGIN block)

I created my own small example, and both use and require seem to work equally well.

I realize that use Foo; is equivalent to BEGIN { require Foo; Foo->import; }, and so using use ``adds one more level''... but it doesn't seem to make a difference in this case, does it?

Comment on Re^2: Odd convention? (fall-back module in BEGIN block)

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Re^3: Odd convention? (fall-back module in BEGIN block) by ikegami (Patriarch) on Feb 15, 2007 at 23:08 UTC
It can make a difference depending on what's in "`...`". Compare `BEGIN { eval 'sub foo { return 2 }'; } my $i = foo 3; # my $i = 2; print("$i\n");` [download] with `eval 'sub foo { return 2 }'; my $i = foo 3; # Syntax error! print("$i\n");` [download] Compare `BEGIN { eval 'sub foo(\@) { print(@{$_[0]}, "\n"); }'; } my @a = qw( foo bar ); foo(@a); # foobar` [download] with `eval 'sub foo(\@) { print(@{$_[0]}, "\n"); }'; my @a = qw( foo bar ); foo(@a); # [undef]` [download] Compare `BEGIN { eval 'sub foo { print("foo\n"); }'; } BEGIN { foo(); } # foo` [download] with `eval 'sub foo { print("foo\n"); }'; BEGIN { foo(); } # Dies. Can't find foo()` [download] etc.	[reply] [d/l] [select]

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Re^3: Odd convention? (fall-back module in BEGIN block)
by ikegami (Patriarch) on Feb 15, 2007 at 23:08 UTC

It can make a difference depending on what's in "...".

Compare

BEGIN { eval 'sub foo { return 2 }'; }
my $i = foo 3;  # my $i = 2;
print("$i\n");
[download]

with

eval 'sub foo { return 2 }';
my $i = foo 3;  # Syntax error!
print("$i\n");
[download]

Compare

BEGIN { eval 'sub foo(\@) { print(@{$_[0]}, "\n"); }'; }
my @a = qw( foo bar );
foo(@a);  # foobar
[download]

with

eval 'sub foo(\@) { print(@{$_[0]}, "\n"); }';
my @a = qw( foo bar );
foo(@a);  # [undef]
[download]

Compare

BEGIN { eval 'sub foo { print("foo\n"); }'; }
BEGIN { foo(); }  # foo
[download]

with

eval 'sub foo { print("foo\n"); }';
BEGIN { foo(); }  # Dies. Can't find foo()
[download]

etc.

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