[Picojson] Let the key of objects in json be ordered by default #16863
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Previously picojson define `object` as an alias of `std::unordered_map`. That means when parsing json, the order of keys in objects are uncertain and dependent on implementation. This makes it inconvenient for certain applications, e.g. in LLM generation output, we wish the order of keys the same as the order in the json file. This PR implements a ordered hashmap `ordered_hashmap` that 1) maintains the order in which the elements are inserted, and 2) have the same interface as `std::unordered_map`. Picojson will define object as an alias of `ordered_hashmap`, so the order of the input json is maintained when parsing. Macro `PICOJSON_USE_ORDERED_OBJECT` controls whether object uses the ordered version or the unordered version. It is set by default.
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Previously picojson define
objectas an alias ofstd::unordered_map. That means when parsing json, the order of keys in objects are uncertain and dependent on implementation. This makes it inconvenient for certain applications, e.g. in LLM generation output, we wish the order of keys the same as the order in the json file.This PR implements a ordered hashmap
ordered_hashmapthat 1) maintains the order in which the elements are inserted, and 2) have the same interface asstd::unordered_map. Picojson will define object as an alias ofordered_hashmap, so the order of the input json is maintained when parsing.Macro
PICOJSON_USE_ORDERED_OBJECTcontrols whether object uses the ordered version or the unordered version. It is set by default.