Unfortunately, as of 5.8.0, that still doesn't work properly.
perl> print join "\n", map{ \substr 'The quick brown fox', $_ } 0 ..
+19
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
LVALUE(0x15d7cf4)
As you can see, each time you take an Lvalue from substr, it re-uses the same address. So you end up with and array of pointers to the last char in the string.
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller
-
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.
|