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autodie::Util(3)       Perl Programmers	Reference Guide	      autodie::Util(3)

       autodie::Util - Internal	Utility	subroutines for	autodie	and Fatal

	   # INTERNAL API for autodie and Fatal	only!

	   use autodie::Util qw(on_end_of_compile_scope);
	   on_end_of_compile_scope(sub { print "Hallo world\n";	});

       Interal Utilities for autodie and Fatal!	 This module is	not a part of
       autodie's public	API.

       This module contains utility subroutines	for abstracting	away the
       underlying magic	of autodie and (ab)uses	of "%^H" to call subs at the
       end of a	(compile-time) scopes.

       Note that due to	how "%^H" works, some of these utilities are only
       useful during the compilation phase of a	perl module and	relies on the
       internals of how	perl handles references	in "%^H".


	 on_end_of_compile_scope(sub { print "Hallo world\n"; });

       Will invoke a sub at the	end of a (compile-time)	scope.	The sub	is
       called once with	no arguments.  Can be called multiple times (even in
       the same	"compile-time" scope) to install multiple subs.	 Subs are
       called in a "first-in-last-out"-order (FILO or "stack"-order).



       Given a Perl subroutine prototype, return a list	of invocation
       specifications.	Each specification is a	listref, where the first
       member is the (minimum) number of arguments for this invocation
       specification.  The remaining arguments are a string representation of
       how to pass the arguments correctly to a	sub with the given prototype,
       when called with	the given number of arguments.

       The specifications are returned in increasing order of arguments
       starting	at 0 (e.g.  ';$') or 1 (e.g.  '$@').  Note that	if the
       prototype is "slurpy" (e.g. ends	with a "@"), the number	of arguments
       for the last specification is a "minimum" number	rather than an exact
       number.	This can be detected by	the last member	of the last
       specification matching m/[@#]_/.


	 make_core_trampoline('CORE::open', 'main', prototype('CORE::open'))

       Creates a trampoline for	calling	a core sub.  Essentially, a tiny sub
       that figures out	how we should be calling our core sub, puts in the
       arguments in the	right way, and bounces our control over	to it.

       If we could reliably use	`goto &` on core builtins, we wouldn't need
       this subroutine.


	 install_subs('My::Module', { 'read' =>	sub { die("Hallo\n"), ... }})

       Given a package name and	a hashref mapping names	to a subroutine
       reference (or "undef"), this subroutine will install said subroutines
       on their	given name in that module.  If a name mapes to "undef",	any
       subroutine with that name in the	target module will be remove (possibly
       "unshadowing" a CORE sub	of same	name).

       Copyright 2013-2014, Niels Thykier <>

       This module is free software.  You may distribute it under the same
       terms as	Perl itself.

perl v5.36.0			  2021-04-29		      autodie::Util(3)


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