[Issue 14478] isInputRange failed to recognize some ranges

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14478

Jonathan M Davis <issues.dlang at jmdavisProg.com> changed:

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--- Comment #3 from Jonathan M Davis <issues.dlang at jmdavisProg.com> ---
If

auto h = r.front;

doesn't work, then I don't think that it can be a range. And if that means
that elements have to be copyable to be in a range, then I think that
they're going to have to be copyable. There is going to be _way_ too much
code out there that does

auto h = r.front;

for it to work to try and claim that something is an input range when that
line doesn't work. And IIRC, C++ STL containers require that their elements
be copyable in order to work, so it's not like we'd be the first to require
this sort of thing.

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