Daniel Gibson:
That would be too much magic => special cases one has to know
about.
What special cases? It works for POD structs. If you want a
different hashing behavior (example: you want to ignore some
fields), you define the two methods.
struct Foo {
double x;
int y;
string s;
}
void main() {
import std.stdio;
bool[Foo] aa;
aa[Foo(1.0, 2, "hello".idup)] = true;
aa[Foo(1.0, 1, "hello".idup)] = false;
aa[Foo(1.0, 2, "hello".idup)] = false;
aa.writeln;
}
Outputs:
[Foo(1, 1, "hello"):false, Foo(1, 2, "hello"):false]
This was a very old large bug of D. Now it's fixed. Rejoice.
Bye,
bearophile
