Niels Lohmann 4976d054e1 Do not construct the base class when destroying a container (#5995) ...

json_value::destroy_container() and destroy_walk() used default-
constructed basic_json values as stand-ins, which construct a
CustomBaseClass that belongs to no value. A base class whose default
constructor allocates made the noexcept destructor allocate again, and
terminate if that allocation failed, which #5762 set out to prevent.

Use data (type and value, no base class) as the stand-in instead, and
pass the children's m_data to the walk helpers.

Add a test with a counting base class: destroying a value constructs no
base object and destroys exactly one per value, also for values nested
deeper than the recursion depth limit.

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

2026-11-01 22:48:44 +01:00

..

nlohmann

Do not construct the base class when destroying a container (#5995)

2026-11-01 22:48:44 +01:00