Niels Lohmann a05b22ddf3 Let to_json(std::optional<T>) propagate exceptions from T's to_json ...

The overload was marked noexcept even though its body assigns *opt to
the JSON value, which calls T's to_json (or allocates for std::string,
std::vector, or json). Any exception from there -- a user-defined
to_json reporting an error, or std::bad_alloc -- called std::terminate()
instead of propagating. The noexcept also made basic_json's converting
constructor noexcept(true) for std::optional<T>, so json j = opt; could
not report the error either.

Fixes #5642.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-09-29 23:17:33 +02:00

..

nlohmann

Let to_json(std::optional<T>) propagate exceptions from T's to_json

2026-09-29 23:17:33 +02:00