Niels Lohmann 82667aadff Convert one-element tuples to arrays on every compiler ...

to_json for std::tuple assigns a braced list, j = { std::get<Idx>(t)... }.
With a single element that is itself a basic_json, Apple clang 15 and 16
treat j = {x} as a copy of x, so std::tuple<json>{true} became true
instead of [true]. The macOS jobs (Xcode 15.1, 16.1) failed the new
checks in unit-disable-tuple-reference-conversion and unit-regression2.

The one-element overload that already handles
JSON_BRACE_INIT_COPY_SEMANTICS builds the array (or object, for a
[string, value] element) explicitly, the same way the initializer-list
constructor does. Use it unconditionally. The output is unchanged on
compilers that already wrapped the element.

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

2026-09-28 02:10:24 +02:00

..

json_fwd.hpp

Make JSON_STRICT_NUL_HANDLING part of the ABI tag (#5560)

2026-09-25 21:54:11 +02:00

json.hpp

Convert one-element tuples to arrays on every compiler

2026-09-28 02:10:24 +02:00