Niels Lohmann 5a2b8a274d Do not require the container iterators to be nothrow move constructible ...

iter_impl declared its defaulted move operations noexcept. The exception
specification a defaulted function gets implicitly follows from its members,
here internal_iterator, which holds the object and array iterators. libstdc++
gives std::deque's iterator a user-provided copy constructor without noexcept
before version 11, so the implicit specification is noexcept(false) and does
not match the declared one. That deletes the function -- and with g++ 4.8,
which predates CWG 1778, it is an error outright:

    error: function 'iter_impl<basic_json<std::map, std::deque> >::iter_impl(
    iter_impl&&)' defaulted on its first declaration with an
    exception-specification that differs from the implicit declaration

So std::deque, which this branch documents as a usable array type, could not
be used with an older standard library. Leaving the specification to be
computed cannot mismatch; iteration_proxy_value already spells out the same
condition next door.

The default configuration is unaffected: json::iterator, json::const_iterator
and ordered_json::iterator stay nothrow move constructible and move
assignable, which the test now checks so it cannot regress unnoticed.

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

2026-08-28 19:09:51 +00:00

..

nlohmann

Do not require the container iterators to be nothrow move constructible

2026-08-28 19:09:51 +00:00