phpMan > man > autodie::Util

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

SYNOPSIS
        # 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"; });

DESCRIPTION
    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".

  Methods
   on_end_of_compile_scope
      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).

   fill_protos
      fill_protos('*$$;$@')

    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
      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
      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).

AUTHOR
    Copyright 2013-2014, Niels Thykier <niels AT thykier.net>

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