Niels Lohmann a9cc4243b7 Fix tautological clause in iter_impl's iterator category assertion ...

The static_assert meant to check the LegacyBidirectionalIterator
named requirement had a first clause comparing
std::bidirectional_iterator_tag to itself, which is always true and
checks nothing; only array_t::iterator was actually being checked,
despite the message claiming object iterators were checked too.
Drop the tautological clause, reword the message to describe what
is actually checked, and note that object_t may use a forward-only
iterator as long as reverse iteration and operator-- are unused.
The check is intentionally not extended to object_t::iterator, since
that would reject object types with forward-only iterators that
compile and work correctly today.

Part of #5708

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-09-30 09:54:59 +02:00

..

nlohmann

Fix tautological clause in iter_impl's iterator category assertion

2026-09-30 09:54:59 +02:00