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Take the output adapter by reference at the serializer ctor

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Per review: the serializer still holds the adapter as a non-owning
pointer, but the constructor now takes output_adapter_protocol<char>&
and takes its address internally, so every call site passes a
reference. A reference cannot be null and reads as a borrow, which
makes the lifetime contract harder to get wrong than handing over a
raw pointer. The stored member and the write path are unchanged.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XAYM1qhSA2FDaDcGfPW3fG
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-03 07:42:14 +02:00
co-authored by Claude
parent 386dc225fc
commit 5c331d1fab
4 changed files with 9 additions and 9 deletions
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include/nlohmann/detail/output/serializer.hpp
+2 -2
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@@ -68,9 +68,9 @@ class serializer
@param[in] ichar indentation character to use
@param[in] error_handler_ how to react on decoding errors
*/
serializer(output_adapter_protocol<char>* s, const char ichar,
serializer(output_adapter_protocol<char>& s, const char ichar,
error_handler_t error_handler_ = error_handler_t::strict)
: o(s)
: o(&s)
, loc(std::localeconv())
, thousands_sep(loc->thousands_sep == nullptr ? '\0' : std::char_traits<char>::to_char_type(* (loc->thousands_sep)))
, decimal_point(loc->decimal_point == nullptr ? '\0' : std::char_traits<char>::to_char_type(* (loc->decimal_point)))