package Fatal; use Carp; use strict; use vars qw( $AUTOLOAD $Debug $VERSION); $VERSION = 1.02; $Debug = 0 unless defined $Debug; sub import { my $self = shift(@_); my($sym, $pkg); $pkg = (caller)[0]; foreach $sym (@_) { &_make_fatal($sym, $pkg); } }; sub AUTOLOAD { my $cmd = $AUTOLOAD; $cmd =~ s/.*:://; &_make_fatal($cmd, (caller)[0]); goto &$AUTOLOAD; } sub fill_protos { my $proto = shift; my ($n, $isref, @out, @out1, $seen_semi) = -1; while ($proto =~ /\S/) { $n++; push(@out1,[$n,@out]) if $seen_semi; push(@out, $1 . "{\$_[$n]}"), next if $proto =~ s/^\s*\\([\@%\$\&])//; push(@out, "\$_[$n]"), next if $proto =~ s/^\s*([*\$&])//; push(@out, "\@_[$n..\$#_]"), last if $proto =~ s/^\s*(;\s*)?\@//; $seen_semi = 1, $n--, next if $proto =~ s/^\s*;//; # XXXX ???? die "Unknown prototype letters: \"$proto\""; } push(@out1,[$n+1,@out]); @out1; } sub write_invocation { my ($core, $call, $name, @argvs) = @_; if (@argvs == 1) { # No optional arguments my @argv = @{$argvs[0]}; shift @argv; return "\t" . one_invocation($core, $call, $name, @argv) . ";\n"; } else { my $else = "\t"; my (@out, @argv, $n); while (@argvs) { @argv = @{shift @argvs}; $n = shift @argv; push @out, "$ {else}if (\@_ == $n) {\n"; $else = "\t} els"; push @out, "\t\treturn " . one_invocation($core, $call, $name, @argv) . ";\n"; } push @out, < provides a way to conveniently replace functions which normally return a false value when they fail with equivalents which halt execution if they are not successful. This lets you use these functions without having to test their return values explicitly on each call. Errors are reported via C, so you can trap them using C<$SIG{__DIE__}> if you wish to take some action before the program exits. The do-or-die equivalents are set up simply by calling Fatal's C routine, passing it the names of the functions to be replaced. You may wrap both user-defined functions and overridable CORE operators (except C, C which cannot be expressed via prototypes) in this way. =head1 AUTHOR Lionel.Cons@cern.ch prototype updates by Ilya Zakharevich ilya@math.ohio-state.edu =cut