package Fatal; use 5.006_001; use Carp; use strict; our($AUTOLOAD, $Debug, $VERSION); $VERSION = 1.03; $Debug = 0 unless defined $Debug; sub import { my $self = shift(@_); my($sym, $pkg); my $void = 0; $pkg = (caller)[0]; foreach $sym (@_) { if ($sym eq ":void") { $void = 1; } else { &_make_fatal($sym, $pkg, $void); } } }; 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, $void, @argvs) = @_; if (@argvs == 1) { # No optional arguments my @argv = @{$argvs[0]}; shift @argv; return "\t" . one_invocation($core, $call, $name, $void, @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, $void, @argv) . ";\n"; } push @out, < provides a way to conveniently replace functions which normally return a false value when they fail with equivalents which raise exceptions if they are not successful. This lets you use these functions without having to test their return values explicitly on each call. Exceptions can be caught using C. See L and L for details. 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. If the symbol C<:void> appears in the import list, then functions named later in that import list raise an exception only when these are called in void context--that is, when their return values are ignored. For example use Fatal qw/:void open close/; # properly checked, so no exception raised on error if(open(FH, "< /bogotic") { warn "bogo file, dude: $!"; } # not checked, so error raises an exception close FH; =head1 AUTHOR Lionel.Cons@cern.ch prototype updates by Ilya Zakharevich ilya@math.ohio-state.edu =cut