On Thursday, 11 June 2015 at 19:31:52 UTC, Walter Bright wrote:
On 6/11/2015 8:03 AM, Dicebot wrote:
On the other hand they have one important advantage: all type
arguments must
comply to one or more trairs and thus bodies of generics are
checked before
institation. You are only allowed to call methods and
operations of generic
arguments that are defined in relevan trait. This is huge win
for code hygiene
compared to D.
On the other hand, generic bodies in D can inquire if various
additional traits are available, and then adapt:
struct S(R) if (isInputRange!R)
{
...
static if (isForwardRange!R)
{
R save()
{
auto result = this;
result.r = r.save;
return result;
}
}
...
}
This kind of thing is used extensively in Phobos generics.
It's not *quite* the same. I believe Rust traits are closer to
C++ concepts.
