prototype

    my $proto = prototype( $code )

Since version 1.40.

Returns the prototype of the given $code reference, if it has one, as a string. This is the same as the "CORE::prototype" operator; it is included here simply for symmetry and completeness with the other functions.

set_prototype

    my $code = set_prototype $prototype, $code;

Since version 1.40.

Sets the prototype of the function given by the $code reference, or deletes it if $prototype is "undef". Returns the $code reference itself.

Caution: This function takes arguments in a different order to the previous copy of the code from "Scalar::Util". This is to match the order of "set_subname", and other potential additions in this file. This order has been chosen as it allows a neat and simple chaining of other "Sub::Util::set_*" functions as might become available, such as:

 my $code =
    set_subname   name_here =>
    set_prototype '&@'      =>
    set_attribute ':lvalue' =>
       sub { ...... };

subname

    my $name = subname( $code )

Since version 1.40.

Returns the name of the given $code reference, if it has one. Normal named subs will give a fully-qualified name consisting of the package and the localname separated by "::". Anonymous code references will give "__ANON__" as the localname. If the package the code was compiled in has been deleted (e.g. using "delete_package" from Symbol), "__ANON__" will be returned as the package name. If a name has been set using "set_subname", this name will be returned instead.

This function was inspired by "sub_fullname" from Sub::Identify. The remaining functions that "Sub::Identify" implements can easily be emulated using regexp operations, such as

 sub get_code_info { return (subname $_[0]) =~ m/^(.+)::(.*?)$/ }
 sub sub_name      { return (get_code_info $_[0])[0] }
 sub stash_name    { return (get_code_info $_[0])[1] }

Users of Sub::Name beware: This function is not the same as "Sub::Name::subname"; it returns the existing name of the sub rather than changing it. To set or change a name, see instead "set_subname".

set_subname

    my $code = set_subname $name, $code;

Since version 1.40.

Sets the name of the function given by the $code reference. Returns the $code reference itself. If the $name is unqualified, the package of the caller is used to qualify it.

This is useful for applying names to anonymous CODE references so that stack traces and similar situations, to give a useful name rather than having the default of "__ANON__". Note that this name is only used for this situation; the "set_subname" will not install it into the symbol table; you will have to do that yourself if required.

However, since the name is not used by perl except as the return value of "caller", for stack traces or similar, there is no actual requirement that the name be syntactically valid as a perl function name. This could be used to attach extra information that could be useful in debugging stack traces.

This function was copied from "Sub::Name::subname" and renamed to the naming convention of this module.