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Sep 12, 2006, 2:20:04 PM9/12/06

to perl6-l...@perl.org

Author: larry

Date: Tue Sep 12 11:20:04 2006

New Revision: 11971

Date: Tue Sep 12 11:20:04 2006

New Revision: 11971

Modified:

doc/trunk/design/syn/S03.pod

Log:

Further clarifications and fixups.

Modified: doc/trunk/design/syn/S03.pod

==============================================================================

--- doc/trunk/design/syn/S03.pod (original)

+++ doc/trunk/design/syn/S03.pod Tue Sep 12 11:20:04 2006

@@ -14,7 +14,7 @@

Date: 8 Mar 2004

Last Modified: 12 Sep 2006

Number: 3

- Version: 59

+ Version: 60

=head1 Changes to Perl 5 operators

@@ -982,7 +982,7 @@

Likewise, from the fact that list context flattens inner arrays and

lists, it follows that a reduced assignment does no special syntactic

-dwimmery, and hence only scalar assigments are supported. Therefore

+dwimmery, and hence only scalar assignments are supported. Therefore

[=] $x, @y, $z, 0

[+=] $x, @y, $z, 1

@@ -1067,10 +1067,17 @@

@a Xcmp @b Xcmp @c # ILLEGAL

@a Xeq @b Xeq @c # ok

+In fact, though the C<X> operators are all list associative

+syntactically, the underlying operator is always applied with its

+own associativity.

+

Unlike bare C<X>, the C<X,> form flattens much like C<[,]> does.

<a b> X, <1 2> # 'a', '1', 'a', '2', 'b', '1', 'b', '2'

+Note that only the first term of an C<X> operator may reasonably be

+an infinite list.

+

=head1 Junctive operators

C<|>, C<&>, and C<^> are no longer bitwise operators (see

@@ -1183,7 +1190,7 @@

my ($b, $c); # okay

my $b, $c; # wrong: "Use of undeclared variable: $c"

-Types occuring between the declarator and the signature are distributed into

+Types occurring between the declarator and the signature are distributed into

each variable:

my Dog ($b, $c);

@@ -1459,6 +1466,7 @@

['a', '1'], ['a', '2'], ['b', '1'], ['b', '2']

It is really a variant of the C<X> metaoperator mentioned earlier.

+

=head1 Minimal whitespace DWIMmery

Whitespace is no longer allowed before the opening bracket of an array

Sep 12, 2006, 3:03:02 PM9/12/06

to perl6-l...@perl.org

> +Note that only the first term of an C<X> operator may reasonably be

> +an infinite list.

Now all we need is a variant that does the diagonal order and we'll be> +an infinite list.

home and dry.

'a'..* diagX 1..*

->

['a', 1],

['a', 2],

['b', 1],

['a', 3],

['b', 2],

['c', 1],

['a', 4],

['b', 3],

['c', 2],

['d', 1],

and so on.

--

Every program eventually reaches a point where it becomes harder to make

a simple change than to rewrite the program from scratch. Unfortunately,

when this point is reached, it is far too late to consider rewriting it.

http://surreal.istic.org/ They knew about the decepticons.

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