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Niels Lohmann
666801a2c6
Since #4958, a key type implicitly convertible to std::string_view was accepted by is_usable_as_basic_json_key_type without checking that the object's comparator can actually compare object_t::key_type with that key type. The key was then forwarded unchanged to the underlying map, so const operator[], at, find, count, contains, erase and value failed to compile (a hard error inside <map>) for a key convertible only to std::string_view, and value() rejected such keys outright. For keys convertible to both std::string and std::string_view, the KeyType&& templates now won overload resolution over the object_t::key_type overloads and then failed the same way, a regression from 3.12.0. Only the non-const operator[] worked, because it uses emplace(), which constructs a std::string from the key explicitly. ordered_json was not affected, since ordered_map checks comparability itself. Add a trait, is_string_view_convertible_key_type, that recognizes a key type that is convertible to std::string_view but not directly comparable with the object's key type, provided std::string_view itself is comparable with it. at(), operator[], find(), count(), contains(), erase() and value() now route such keys through a new lookup_key() helper that converts them to std::string_view before they reach the object, matching how the object's transparent comparator already supports std::string_view lookups. Fixes #5663. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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