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Define flipflops to use smartmatch semantics

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1 parent 2a92e08 commit 6e2d9c944ca5b50cef9e23b15f130a626c1c2b9e @TimToady TimToady committed
Showing with 15 additions and 4 deletions.
  1. +15 −4 S03-operators.pod
19 S03-operators.pod
@@ -14,8 +14,8 @@ Synopsis 3: Perl 6 Operators
Created: 8 Mar 2004
- Last Modified: 6 Mar 2013
- Version: 261
+ Last Modified: 2 May 2013
+ Version: 262
=head1 Overview
@@ -2868,15 +2868,26 @@ C<ff> operator. (C<..> now always produces a C<Range> object
even in item context.) The C<ff> operator may take a caret on
either end to exclude either the beginning or ending. There is
also a corresponding C<fff> operator with Perl 5's C<...> semantics.
-You may say
+The two sides of a flipflop are evaluated as smartmatches against
+the current value of the topic stored in C<$_>. For instance, you may say
/foo/ ff *
-to indicate a flipflop that never flops once flipped.
+to match the first line containing 'foo', along with all following
+lines: since the C<*> always smartmatches, it create a flipflop that
+never flops once flipped.
The state of a flipflop is kept in an anonymous state variable, so separate
closure clones get their own states.
+Note that unlike Perl 5's flipflop, numeric values are not
+automatically checked against the current line number. (If you
+wish to have those semantics for your smartmatches, you could mixin
+a numeric value to C<$_> to create a chimeric object that is both
+integer and string. Conjecture: C<lines()> should have an option that
+does this.)
=item *
All comparison operators are unified at the same precedence level.

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