I have been reading kyle's Context tutorial.
Now I just wonder - how much of context is compile-time, how much run-time? Has that been discussed yet?
I ask because
perl -le 'my $f = 1; ($f > 0 ? @a : $a ) = ("a", "b", "c")'
Assignment to both a list and a scalar at -e line 1, at EOF
Execution of -e aborted due to compilation errors.
could be resolved at run-time, which isn't, because it barfs at compile-time. This works, however:
perl -le 'my $f = -1; ($f > 0 ? @a : @b ) = ("a", "b", "c"); print "a:
+ @a\nb: @b"'
a:
b: a b c
perl -le 'my $f = 1; ($f > 0 ? @a : @b ) = ("a", "b", "c"); print "a:
+@a\nb: @b"'
a: a b c
b:
update: diagnostics tells me that
Execution of -e aborted due to compilation errors (#1)
(F) If you assign to a conditional operator, the 2nd and 3rd arguments
must either both be scalars or both be lists. Otherwise Perl won't
know which context to supply to the right side.
which looks like establishing the context for the RHS is a compile-time thing. Is there such a thing as runtime context resolving, at all?
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.