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nlohmann::fifo_map works through the adapter that has always been documented for it, and preserves the insertion order. Restore its mention in the object order page, which was dropped together with the tsl::ordered_map one: unlike ordered_map it keeps a lookup index, so it is the insertion-ordered option without the quadratic cost. gtl::flat_hash_map and folly::sorted_vector_map work as well, the latter through an alias that drops the allocator, whose value type it disagrees on. gtl::btree_map does not, for the same reason as the other btree containers. None of the Qt containers can be used, each for its own reason: QMap has no value_type, QHash iterators yield the mapped value rather than a pair, QList has no max_size(), QByteArray spells empty() as isEmpty(), and QString is UTF-16. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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