use constant XX => ( ...

[Julian Lafontaine]

Hi Group,

There are two syntax for the "use constant" pragma: to declare a scalar
or to declare a list.

use constant CONST => scalarvalue;

use constant LIST => qw( listitem1, listitem2, listitem3);



I've found this in a perl module :Win32::Exe.
Could someone explain the syntax?


use constant DISPATCH_TABLE => (
"PE\0\0" => "PE",
'*' => sub { die "Incorrect PE header -- not a valid .exe file" },
);

What is DISPATCH_TABLE: a scalar or a list?

Thanks in advance.

 

[Josef Moellers]

Hi Group,

There are two syntax for the "use constant" pragma: to declare a scalar
or to declare a list.

use constant CONST => scalarvalue;

use constant LIST => qw( listitem1, listitem2, listitem3);



I've found this in a perl module :Win32::Exe.
Could someone explain the syntax?


use constant DISPATCH_TABLE => (
"PE\0\0" => "PE",
'*' => sub { die "Incorrect PE header -- not a valid .exe
file" },
);

What is DISPATCH_TABLE: a scalar or a list?

It is a list. The "=>" are "fat commas".

 

[Tad J McClellan]

use constant LIST => qw( listitem1, listitem2, listitem3);

You should always enable warnings when developing Perl code.



[ I also suggest choosing a less common munged address. I have
(e-mail address removed) killfiled due to its use by several trolls.
]

 

[A. Sinan Unur]

use constant DISPATCH_TABLE => (
"PE\0\0" => "PE",
'*' => sub { die "Incorrect PE header -- not a valid
.exe file" },
);

What is DISPATCH_TABLE: a scalar or a list?

It is a list which is most likely used to construct a hash someplace.

Sinan

--
A. Sinan Unur <[email protected]>
(remove .invalid and reverse each component for email address)

comp.lang.perl.misc guidelines on the WWW:
http://www.rehabitation.com/clpmisc/

 

[Julian Lafontaine]

Thank you Josef, Sinan,...

Tad J McClellan a écrit :

You should always enable warnings when developing Perl code.

You, are, definitely, right!,

[ I also suggest choosing a less common munged address. I have
(e-mail address removed) killfiled due to its use by several trolls.
]

 

[Peter J. Holzer]

There are two syntax for the "use constant" pragma: to declare a scalar
or to declare a list.

use constant CONST => scalarvalue;

"scalarvalue" is a scalar.

use constant LIST => qw( listitem1, listitem2, listitem3);

"qw( listitem1, listitem2, listitem3)" is a list (although it probably
doesn't contain the values you would expect).

I've found this in a perl module :Win32::Exe.
Could someone explain the syntax?


use constant DISPATCH_TABLE => (
"PE\0\0" => "PE",
'*' => sub { die "Incorrect PE header -- not a valid .exe file" },
);

What is DISPATCH_TABLE: a scalar or a list?

What is

(
"PE\0\0" => "PE",
'*' => sub { die "Incorrect PE header -- not a valid .exe file" },
)
?

A scalar or a list?