1autodie::Util(3)      User Contributed Perl Documentation     autodie::Util(3)
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NAME

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

9           # INTERNAL API for autodie and Fatal only!
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11           use autodie::Util qw(on_end_of_compile_scope);
12           on_end_of_compile_scope(sub { print "Hallo world\n"; });
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DESCRIPTION

15       Interal Utilities for autodie and Fatal!  This module is not a part of
16       autodie's public API.
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18       This module contains utility subroutines for abstracting away the
19       underlying magic of autodie and (ab)uses of "%^H" to call subs at the
20       end of a (compile-time) scopes.
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22       Note that due to how "%^H" works, some of these utilities are only
23       useful during the compilation phase of a perl module and relies on the
24       internals of how perl handles references in "%^H".
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26   Methods
27       on_end_of_compile_scope
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29         on_end_of_compile_scope(sub { print "Hallo world\n"; });
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31       Will invoke a sub at the end of a (compile-time) scope.  The sub is
32       called once with no arguments.  Can be called multiple times (even in
33       the same "compile-time" scope) to install multiple subs.  Subs are
34       called in a "first-in-last-out"-order (FILO or "stack"-order).
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36       fill_protos
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38         fill_protos('*$$;$@')
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40       Given a Perl subroutine prototype, return a list of invocation
41       specifications.  Each specification is a listref, where the first
42       member is the (minimum) number of arguments for this invocation
43       specification.  The remaining arguments are a string representation of
44       how to pass the arguments correctly to a sub with the given prototype,
45       when called with the given number of arguments.
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47       The specifications are returned in increasing order of arguments
48       starting at 0 (e.g.  ';$') or 1 (e.g.  '$@').  Note that if the
49       prototype is "slurpy" (e.g. ends with a "@"), the number of arguments
50       for the last specification is a "minimum" number rather than an exact
51       number.  This can be detected by the last member of the last
52       specification matching m/[@#]_/.
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54       make_core_trampoline
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56         make_core_trampoline('CORE::open', 'main', prototype('CORE::open'))
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58       Creates a trampoline for calling a core sub.  Essentially, a tiny sub
59       that figures out how we should be calling our core sub, puts in the
60       arguments in the right way, and bounces our control over to it.
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62       If we could reliably use `goto &` on core builtins, we wouldn't need
63       this subroutine.
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65       install_subs
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67         install_subs('My::Module', { 'read' => sub { die("Hallo\n"), ... }})
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69       Given a package name and a hashref mapping names to a subroutine
70       reference (or "undef"), this subroutine will install said subroutines
71       on their given name in that module.  If a name mapes to "undef", any
72       subroutine with that name in the target module will be remove (possibly
73       "unshadowing" a CORE sub of same name).
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AUTHOR

76       Copyright 2013-2014, Niels Thykier <niels@thykier.net>
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LICENSE

79       This module is free software.  You may distribute it under the same
80       terms as Perl itself.
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84perl v5.26.3                      2015-07-09                  autodie::Util(3)
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