• "Nick Sabalausky" <a a.a> Mar 03 2011
• Andrej Mitrovic <andrej.mitrovich gmail.com> Mar 03 2011
• Jonathan M Davis <jmdavisProg gmx.com> Mar 03 2011
• "Nick Sabalausky" <a a.a> Mar 03 2011

"Nick Sabalausky" <a a.a> writes:

In D2, if you do this:

void foo(char[] key)
{
    bool[char[]] aa;
    aa[key] = true;
}

Does that last line allocate a duplicate of key's data?

Andrej Mitrovic <andrej.mitrovich gmail.com> writes:

But it errors out?

Error: associative arrays can only be assigned values with immutable
keys, not char[]

Jonathan M Davis <jmdavisProg gmx.com> writes:

On Thursday 03 March 2011 17:54:46 Nick Sabalausky wrote:
 In D2, if you do this:
 
 void foo(char[] key)
 {
     bool[char[]] aa;
     aa[key] = true;
 }
 
 Does that last line allocate a duplicate of key's data?


More like it's illegal. The key type for associative arrays _must_ be
immutable. 
Previously, that wasn't check for by the compiler, which meant that it was 
possible to change the values of keys (not good), which could quickly result in 
an AA in an invalid state. Not too long ago, however, it was fixed so that
that's 
not legal.

- Jonathan M Davis

"Nick Sabalausky" <a a.a> writes:

"Jonathan M Davis" <jmdavisProg gmx.com> wrote in message 
news:mailman.2156.1299206161.4748.digitalmars-d-learn puremagic.com...
 On Thursday 03 March 2011 17:54:46 Nick Sabalausky wrote:
 In D2, if you do this:

 void foo(char[] key)
 {
     bool[char[]] aa;
     aa[key] = true;
 }

 Does that last line allocate a duplicate of key's data?


 More like it's illegal. The key type for associative arrays _must_ be 
 immutable.
 Previously, that wasn't check for by the compiler, which meant that it was
 possible to change the values of keys (not good), which could quickly 
 result in
 an AA in an invalid state. Not too long ago, however, it was fixed so that 
 that's
 not legal.


Ahh, I'm still on 2.050 so that's probably why it worked for me. (There's no 
particular reason I haven't updated to 2.051 or 2.052, I just got busy with 
non-D stuff for awhile and haven't gotten around to it.)