Re: recursive equal, and firstDifference functions

[Dan]

On Wednesday, 20 March 2013 at 02:03:31 UTC, Jonathan M Davis 
wrote:
We already get this. That's what == does by default. It's just 
that it uses ==
on each member, so if == doesn't work for a particular member 
variable and the
semantics you want for == on the type it's in, you need to 
override opEquals.

Really?
string is one most people would like == to just work for. This 
writes true then false. This certainly takes getting used to. It 
alone is a good reason for the mixins and potentially a 
non-member instancesDeepEqual.

import std.stdio;
struct S {
  string s;
}
void main() {
  writeln("foo" == "foo".idup);
  writeln(S("foo") == S("foo".idup));
}