On Wednesday, 28 January 2015 at 11:30:13 UTC, Marc Schütz wrote:
On Wednesday, 28 January 2015 at 09:44:29 UTC, zhmt wrote:
It is boring coding, I want a solution to copy them
automatically:
void copyObj(SRC,DEST)(SRC src,DEST dest)
{
foreach (i, type; typeof(SRC.tupleof)) {
auto name = SRC.tupleof[i].stringof;
__traits(getMember, dest, name) = __traits(getMember, src,
name);
writeln(name);
}
}
Unfortunitely, it doesnt work, how to improve it?
Haven't tested it, but the `auto name = ...` part is likely to
be the problem. By using `auto`, your declaring a runtime
variable, which you then later try to use with
`__traits(getMember, ...)`, which expects a value known at
compile time. Try using `alias name = ...`, or if that fails,
just repeat the expression `SRC.tupleof[i].stringof` wherever
`name` occurs (though I'm sure there is a nicer way).
And if the alias doesn't work directly, you can always use a
well-known hack:
alias Alias(T) = T;
alias Alias(alias T) = T;
so then this works:
alias member = Alias!(__traits(getMember, Parent, "child"));
Idk if it's a feature or a bug of how getMember works but I had
to use this numerous times.
