On Wednesday, 19 October 2016 at 17:42:39 UTC, Guillaume Piolat
wrote:
On Tuesday, 18 October 2016 at 06:30:15 UTC, Namespace wrote:
On Tuesday, 18 October 2016 at 02:54:08 UTC, Manu wrote:
I just want to be able to pass an rvalue to a function that
receives a
const ref... that's why I came to this forum in the first
place like,
7 years ago. 7 years later... still can't.
I recently wrote a PR for p0nce D idioms, which shows how you
can do that
https://github.com/p0nce/d-idioms/pull/119
Just wanted to add that I still don't know (I'm lazy) what
"auto ref" parameters, "auto ref" return, and friends do in D.
ref is somewhat easy to explain in C++ but complicated in D.
For each auto ref argument the compiler will lazily generate 2^N
functions (therefore "template bloat" if you overdo it). Example:
----
struct A { int id; }
void test(T)(auto ref T a) { }
A a = A(42);
test(a);
----
will generate one function, which takes the argument by ref:
----
void test(ref A a) { }
----
Another call
----
test(A(42));
----
will generate another function, which takes the argument by value:
----
void test(A a) { }
----
That's more ore less the magic behind auto ref.
