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Niels Lohmann
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With JSON_DIAGNOSTICS and JSON_DIAGNOSTIC_POSITIONS, the exceptions of views now carry the same context as those of basic_json: "(/path) " and "(bytes a-b) " in front of the message, in basic_json's format (with JSON_DIAGNOSTICS, no context for the root). Before, views threw without any context, and since get<T>() reads the view directly, conversions had lost even the relative path they used to get through materialize(). The throw helpers of detail/view/errors.hpp take an error_site (document and node; empty without the two macros). Only on the error path, the path is found by descending from the root (pruned by subtree extent before the first edit, a full walk through edited sequences after), and the bytes as materialize() sets them (position_source; a container's end by following the chain of last elements and scanning to the closing brackets). from_json() for views and the strict enum macro put the same context in front through exception_prefix(). Iterators keep their container only under the two macros, for key(). Without the macros, the accessors compile to the same code as before. Tests compare every value's exceptions with those of the parsed or materialized basic_json value, including edited documents; the checks that were disabled under the two macros run again. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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