Florian Albrechtskirchinger 5352856f04 Implement support for string_view (attempt no. 3) (#3423) ... * Add key_compare member to ordered_map * Replace == with key_compare in ordered_map * Expose the actual comparison function used by object_t nlohmann::ordered_map uses a different comparison function than the one provided via template parameter. * Introduce a type trait to detect if object_t has a key_compare member. * Rename object_comparator_t to default_object_comparator_t. * Add object_comparator_t to be conditionally defined as object_t::key_compare, if available, or default_object_comparator_t otherwise. * Update the documentation accordingly. Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com> * Add type traits to check if a type is usable as object key Add type trait to check: * if a type is a specialization of a template. * if a type is a json_pointer. * if a type is a basic_json::{const_,}iterator. * if two types are comparable using a given comparison functor. * if a type is comparable to basic_json::object_t::key_type. * if a type has a member type is_transparent. * if a type is usable as object key. * if a type has an erase() function accepting a given KeyType. Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com> * Rework basic_json element access to accept more key types Rework basic_json element access member functions and operators to accept any type that meets the requirements defined by type trait detail::is_usable_as_key_type. Member functions and operators: * at() * operator[] * value() * erase() * find() * count() * contains() Update documentation to reflect these changes. Add unit tests to excercise the new functions using std::string_view. Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com> Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com>		2022-04-29 21:40:02 +02:00
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json.hpp	Implement support for string_view (attempt no. 3) (#3423)	2022-04-29 21:40:02 +02:00