On 02/10/2011 02:39 PM, Steven Schveighoffer wrote:
On Thu, 10 Feb 2011 07:59:06 -0500, spir <denis.s...@gmail.com> wrote:
Hello,
Implicite deref of struct pointers on member access works fine for data,
methods, even special methods with language semantics like opEquals (see
example below).
But I cannot have 'in' work with method opIn_r. I get:
Error: rvalue of in expression must be an associative array, not S*
What do I have wrong? Or is it a bug: the compiler does not even search the
struct for opIn_r? But then, why does it do it for opEquals?
Denis
struct S {
int i;
void show() { writeln(i); }
const bool opEquals (ref const(S) s) {
writeln("==");
return (i == s.i);
}
bool opIn_r (int j) { return (i==j); }
}
unittest {
S* sp = &(S(1));
writeln(sp.i);
sp.show();
S s2 = S(1);
writeln(sp == s2);
writeln(1 in sp);
}
There is a bug in the compiler that the message says associative array is
required. There is a bugzilla issue somewhere on that...
But it does look like it should work, I'd file a separate bugzilla on the
opIn_r not working.
http://d.puremagic.com/issues/show_bug.cgi?id=5558
Content reproduced below; tell me please if the description is (not) ok.
Denis
==========================================
Issue 5558 - opIn_r not detected as method for 'in' in pointed struct
In a struct, opIn_r is not detected by the compiler as beeing the method
implementing the operator 'in'. Example:
struct S {
int i;
void show() { writeln(i); }
const bool opEquals (ref const(S) s) {
writeln("==");
return (i == s.i);
}
bool opIn_r (int j) { return (i==j); }
}
unittest {
S* sp = &(S(1));
writeln(sp.i);
sp.show();
S s2 = S(1);
writeln(sp == s2);
writeln(1 in s2);
// error:
writeln(1 in sp);
}
==>
Error: rvalue of in expression must be an associative array, not S*
This concerns opIn_r on pointed struct only; the other struct members of the
structn and the not-pointed one are only here to contrast:
* Data members, regular methods and even "language methods" like opEquals are
correctly taken into account on a struct, even via implicite deref.
* opIn_r is correctly detected as implementing 'in' on a non-pointed or
explicitely dereferenced struct.
Thus, the code works fine if one comments out the very last line.
Waiting for a fix, the error message should be corrected to eg:
Error: right operand of 'in' operation must be an associative array
or implement the operator 'in' via method opIn_r
--
_________________
vita es estrany
spir.wikidot.com
