Show unwind() and want_at() in the synopsys and the samples

[perl/modules/Scope-Upper.git] / samples / try.pl

diff --git a/samples/try.pl b/samples/try.pl
new file mode 100644 (file)
index 0000000..d49c183
--- /dev/null
+++ b/samples/try.pl
@@ -0,0 +1,27 @@
+#!perl
+
+use strict;
+use warnings;
+
+use blib;
+
+use Scope::Upper qw/unwind want_at :words/;
+
+sub try (&) {
+ my @result = shift->();
+ my $cx = SUB UP SUB;
+ unwind +(want_at($cx) ? @result : scalar @result) => $cx;
+}
+
+sub zap {
+ try {
+  my @things = qw/a b c/;
+  return @things; # returns to try() and then outside zap()
+ };
+ print "NOT REACHED\n";
+}
+
+my @what = zap(); # @what contains @things
+my $what = zap(); # @what contains @things
+
+print "zap() returns @what in list context and $what in scalar context\n";