Re: isRvalue trait
On Monday, 10 October 2016 at 12:22:54 UTC, Marc Schütz wrote: I would like to overload to an identity op. If the compiler is smart enough to understand what `moveEmplace()` does, it could already do this automatically. Doh! My mistake. I'll use `moveEmplace`, then. Thx!
Re: isRvalue trait
On Monday, 10 October 2016 at 11:46:01 UTC, Nordlöw wrote:
At
https://github.com/nordlow/phobos-next/blob/master/src/moval.d
I've implemented a helper function for creating r-value out of
l-values defined as
E movedToRvalue(E)(ref E e)
{
import std.algorithm.mutation : move;
E value;
move(e, value); // this can be optimized
return value;
}
Doesn't the second overload of `move()` already do what you want?
https://dlang.org/phobos/std_algorithm_mutation.html#.move
Note that in your implementation, you needlessly initialize
`value`, which then needs to be properly destroyed by `move()`,
which the Phobos implementation avoids:
https://github.com/dlang/phobos/blob/master/std/algorithm/mutation.d#L1083-L1088
For the case when movedToRvalue is called with an r-value, such
as in,
static assert(__traits(compiles, { consume(S(14)); }));
I would like to overload to an identity op.
If the compiler is smart enough to understand what
`moveEmplace()` does, it could already do this automatically.
Re: isRvalue trait
On Monday, 10 October 2016 at 11:51:09 UTC, Nordlöw wrote: Found it: http://forum.dlang.org/post/n8m8bh$2vgc$1...@digitalmars.com https://issues.dlang.org/show_bug.cgi?id=15634 Ok, so I added `isLvalue` and `isRvalue` to https://github.com/nordlow/phobos-next/blob/master/src/moval.d Now the next follow-up question becomes how to use it to restrict/overload my definition of `movedToRvalue()` since `isLvalue` takes an alias as argument and `movedToRvalue` takes a reference to an instance. How to solve this?
Re: isRvalue trait
On Monday, 10 October 2016 at 11:46:01 UTC, Nordlöw wrote: Is there one? Found it: http://forum.dlang.org/post/n8m8bh$2vgc$1...@digitalmars.com https://issues.dlang.org/show_bug.cgi?id=15634
isRvalue trait
At
https://github.com/nordlow/phobos-next/blob/master/src/moval.d
I've implemented a helper function for creating r-value out of
l-values defined as
E movedToRvalue(E)(ref E e)
{
import std.algorithm.mutation : move;
E value;
move(e, value); // this can be optimized
return value;
}
For the case when movedToRvalue is called with an r-value, such
as in,
static assert(__traits(compiles, { consume(S(14)); }));
I would like to overload to an identity op.
Is this currently possible somehow? I cannot find any trait
`isRvalue` that fulfills
static assert(isRvalue!(S(14)));
Is there one?
