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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
2026-09-01 05:29:01 +00:00
committed by Claude
co-authored by Claude
parent 2998f2c731
commit c401d495a3
4 changed files with 9 additions and 9 deletions
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include/nlohmann/detail/output/serializer.hpp
+2 -2
View File
@@ -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)))
include/nlohmann/json.hpp
+2 -2
View File
@@ -1342,7 +1342,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
{
string_t result;
detail::output_string_adapter<char, string_t> string_adapter(result);
serializer s(&string_adapter, indent_char, error_handler);
serializer s(string_adapter, indent_char, error_handler);
if (indent >= 0)
{
@@ -4057,7 +4057,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
// do the actual serialization
detail::output_stream_adapter<char> stream_adapter(o);
serializer s(&stream_adapter, o.fill());
serializer s(stream_adapter, o.fill());
s.dump(j, pretty_print, false, static_cast<unsigned int>(indentation));
return o;
}