(Upd: I didn't take into account that \1 is a constant itself. Please ignore this post )

anyway I think it's a notable result of this discussion that the location of constants and literals will not be fixed at compiletime!

That's not true. Constants are allocated once at compile time. 

for (1..3) {
   print(\1, "\n");

   push @x, 'x';  # Prevent reuse of memory addresses.
}

[download]
SCALAR(0x236d94)
SCALAR(0x236d94)
SCALAR(0x236d94)

[download]

They are tied to the opcode, and the same constant is returned every time. 

PP(pp_const)
{
    dVAR;
    dSP;
    XPUSHs(cSVOP_sv);
    RETURN;
}

[download]

If you see otherwise, it's because you're looking at a *copy* of the constant.

Note that different instances of the same literal results in different constants. 

for (1..3) {
   print(\1, ' ', \1, "\n");

   push @x, 'x';  # Prevent reuse of memory addresses.
}

[download]
SCALAR(0x236d94) SCALAR(0x183179c)
SCALAR(0x236d94) SCALAR(0x183179c)
SCALAR(0x236d94) SCALAR(0x183179c)

[download]

In reply to Re^9: Reference of constants and literals by ikegami
in thread Reference of constants and literals by LanX

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.