Niels Lohmann 0db359cabc Restore v3.12.0 support for custom object key types ...

Custom object_t types whose key_type is not string_t compiled with
v3.12.0 for several APIs that unreleased changes broke:

- to_bson failed for every custom key type (#5553 kept a const string_t*
  to the key); the nested entry's header is now written where the entry
  is found.
- Copying deep values (and parse, merge_patch, update, insert) required
  operator== on keys (#5389); keys without one are now paired via find().
- to_cbor/to_msgpack required an implicit conversion to string_t (#5746,
  #5328); keys without one go through a temporary basic_json again.
- at() required a conversion to string_t for its error message (#5727);
  other keys are passed to concat() unchanged again.

The new unit-custom-object-key-type.cpp covers five key types with
different capabilities.

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

2026-10-09 14:37:07 +02:00

..

~basic_json.md

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2026-10-02 11:32:15 +02:00

accept.md

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2026-10-02 11:32:15 +02:00

array_t.md

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2026-10-02 11:32:15 +02:00

array.md

📝 add more docs (#5231)

2026-07-04 11:13:25 +02:00

as_base_class.md

Add basic_json::as_base_class and document name conflicts with custom base classes (#5589)

2026-10-04 12:00:31 +02:00

at.md

Fix key types convertible to std::string_view breaking lookups (#5689)

2026-10-04 11:46:32 +02:00

back.md

📝 update documentation (#4723)

2025-04-05 18:54:35 +02:00

basic_json.md

Make cross-string-type basic_json conversion explicit without implicit conversions (#5591)

2026-10-04 11:46:52 +02:00

begin.md

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2026-10-02 11:32:15 +02:00

binary_t.md

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2026-10-02 11:32:15 +02:00

binary.md

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2026-10-02 11:32:15 +02:00

boolean_t.md

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2026-10-02 11:32:15 +02:00

cbegin.md

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2026-10-02 11:32:15 +02:00

cbor_tag_handler_t.md

Allow SAX parsing of tagged CBOR (#5740)

2026-10-07 07:38:24 +02:00

cend.md

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2026-10-02 11:32:15 +02:00

clear.md

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2026-10-02 11:32:15 +02:00

contains.md

Fix key types convertible to std::string_view breaking lookups (#5689)

2026-10-04 11:46:32 +02:00

count.md

Fix key types convertible to std::string_view breaking lookups (#5689)

2026-10-04 11:46:32 +02:00

crbegin.md

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2026-10-02 11:32:15 +02:00

crend.md

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2026-10-02 11:32:15 +02:00

default_object_comparator_t.md

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2026-10-02 11:32:15 +02:00

diff.md

Clarify wording in diff documentation (#5759)

2026-10-04 18:20:20 +02:00

dump.md

Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

2026-10-04 12:13:49 +02:00

emplace_back.md

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2026-10-02 11:32:15 +02:00

emplace.md

Accept lvalues in ordered_map::emplace's value parameter (#5685)

2026-10-04 11:46:25 +02:00

empty.md

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2026-10-02 11:32:15 +02:00

end_pos.md

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2025-01-17 06:53:35 +01:00

end.md

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2026-10-02 11:32:15 +02:00

erase.md

Fix key types convertible to std::string_view breaking lookups (#5689)

2026-10-04 11:46:32 +02:00

error_handler_t.md

Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

2026-10-04 12:13:49 +02:00

exception.md

Overwork documentation (#4516)

2024-12-09 23:02:30 +01:00

find.md

Fix key types convertible to std::string_view breaking lookups (#5689)

2026-10-04 11:46:32 +02:00

flatten.md

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2026-10-02 11:32:15 +02:00

format_as.md

Documentation review (#5257)

2026-07-09 17:24:19 +02:00

from_bjdata.md

Add deprecated from_bon8/from_bjdata(ptr, len) overloads (#5688)

2026-10-04 22:11:34 +02:00

from_bon8.md

Add deprecated from_bon8/from_bjdata(ptr, len) overloads (#5688)

2026-10-04 22:11:34 +02:00

from_bson.md

Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

2026-10-04 12:13:49 +02:00

from_cbor.md

Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

2026-10-04 12:13:49 +02:00

from_msgpack.md

Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

2026-10-04 12:13:49 +02:00

from_ubjson.md

Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

2026-10-04 12:13:49 +02:00

front.md

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2025-04-05 18:54:35 +02:00

get_allocator.md

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2026-10-02 11:32:15 +02:00

get_binary.md

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2026-06-29 22:15:18 +02:00

get_ptr.md

Overwork documentation (#4516)

2024-12-09 23:02:30 +01:00

get_ref.md

Fix return value of get_ptr for unsigned integers (#4525)

2024-12-06 18:38:25 +01:00

get_to.md

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2026-10-02 11:32:15 +02:00

get.md

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2026-10-02 11:32:15 +02:00

index.md

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2026-10-06 22:33:29 +02:00

input_format_t.md

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2026-10-02 11:32:15 +02:00

insert.md

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2026-10-02 11:32:15 +02:00

invalid_iterator.md

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2026-06-29 22:15:18 +02:00

is_array.md

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2026-10-02 11:32:15 +02:00

is_binary.md

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2026-10-02 11:32:15 +02:00

is_boolean.md

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2026-10-02 11:32:15 +02:00

is_discarded.md

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2026-10-02 11:32:15 +02:00

is_null.md

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2026-10-02 11:32:15 +02:00

is_number_float.md

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2025-04-05 18:54:35 +02:00

is_number_integer.md

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2025-04-05 18:54:35 +02:00

is_number_unsigned.md

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2025-04-05 18:54:35 +02:00

is_number.md

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2026-06-29 22:15:18 +02:00

is_object.md

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2026-10-02 11:32:15 +02:00

is_primitive.md

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is_string.md

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2026-10-02 11:32:15 +02:00

is_structured.md

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2025-04-05 18:54:35 +02:00

items.md

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2026-10-02 11:32:15 +02:00

json_base_class_t.md

Add basic_json::as_base_class and document name conflicts with custom base classes (#5589)

2026-10-04 12:00:31 +02:00

json_serializer.md

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2026-10-02 11:32:15 +02:00

max_size.md

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2026-10-02 11:32:15 +02:00

merge_patch.md

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2026-10-02 11:32:15 +02:00

meta.md

Deduplicate basic_json internals; make insert(pos, json&&) move (#5727)

2026-10-04 11:57:41 +02:00

number_float_t.md

Handle numbers that do not fit narrow number types in the binary readers (#5607)

2026-10-04 17:53:29 +02:00

number_integer_t.md

Handle numbers that do not fit narrow number types in the binary readers (#5607)

2026-10-04 17:53:29 +02:00

number_unsigned_t.md

Handle numbers that do not fit narrow number types in the binary readers (#5607)

2026-10-04 17:53:29 +02:00

object_comparator_t.md

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2026-10-02 11:32:15 +02:00

object_t.md

Restore v3.12.0 support for custom object key types

2026-10-09 14:37:07 +02:00

object.md

📝 add more docs (#5231)

2026-07-04 11:13:25 +02:00

operator_eq.md

Make comparisons with scalars noexcept only when the conversion is (#5751)

2026-10-02 17:25:17 +02:00

operator_ge.md

Make comparisons with scalars noexcept only when the conversion is (#5751)

2026-10-02 17:25:17 +02:00

operator_gt.md

Make comparisons with scalars noexcept only when the conversion is (#5751)

2026-10-02 17:25:17 +02:00

operator_le.md

Make comparisons with scalars noexcept only when the conversion is (#5751)

2026-10-02 17:25:17 +02:00

operator_lt.md

Make comparisons with scalars noexcept only when the conversion is (#5751)

2026-10-02 17:25:17 +02:00

operator_ne.md

Make comparisons with scalars noexcept only when the conversion is (#5751)

2026-10-02 17:25:17 +02:00

operator_spaceship.md

Make comparisons with scalars noexcept only when the conversion is (#5751)

2026-10-02 17:25:17 +02:00

operator_value_t.md

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2026-10-02 11:32:15 +02:00

operator_ValueType.md

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2026-10-02 11:32:15 +02:00

operator[].md

Assert on missing array indices in const operator[] and document the JSON pointer case (#5606)

2026-10-04 11:46:18 +02:00

operator+=.md

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2026-10-02 11:32:15 +02:00

operator=.md

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2026-06-29 22:15:18 +02:00

other_error.md

📝 fix docs (#5217)

2026-06-29 22:15:18 +02:00

out_of_range.md

📝 fix docs (#5217)

2026-06-29 22:15:18 +02:00

parse_error.md

Fix raw-TeX formulas and other documentation infrastructure debt (#5736)

2026-09-30 22:15:20 +02:00

parse_event_t.md

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2026-10-02 11:32:15 +02:00

parse.md

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2026-10-02 11:32:15 +02:00

parser_callback_t.md

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2026-10-02 11:32:15 +02:00

patch_inplace.md

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2026-10-02 11:32:15 +02:00

patch.md

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2026-10-02 11:32:15 +02:00

push_back.md

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2026-10-02 11:32:15 +02:00

rbegin.md

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2026-10-02 11:32:15 +02:00

rend.md

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2026-10-02 11:32:15 +02:00

sax_parse.md

Allow SAX parsing of tagged CBOR (#5740)

2026-10-07 07:38:24 +02:00

size.md

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2026-10-02 11:32:15 +02:00

start_pos.md

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2025-01-17 06:53:35 +01:00

std_formatter.md

Documentation review (#5257)

2026-07-09 17:24:19 +02:00

std_hash.md

Make std::hash<basic_json> consistent with operator== for numbers (#5772)

2026-10-07 19:18:51 +02:00

std_swap.md

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2026-06-29 22:15:18 +02:00

string_t.md

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2026-10-02 11:32:15 +02:00

swap.md

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2026-10-02 11:32:15 +02:00

to_bjdata.md

Throw type_error.321 when serializing discarded values to binary formats (#5761)

2026-10-06 07:33:34 +02:00

to_bon8.md

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2026-10-02 11:32:15 +02:00

to_bson.md

Throw type_error.321 when serializing discarded values to binary formats (#5761)

2026-10-06 07:33:34 +02:00

to_cbor.md

Throw type_error.321 when serializing discarded values to binary formats (#5761)

2026-10-06 07:33:34 +02:00

to_msgpack.md

Throw type_error.321 when serializing discarded values to binary formats (#5761)

2026-10-06 07:33:34 +02:00

to_string.md

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2026-10-02 11:32:15 +02:00

to_ubjson.md

Throw type_error.321 when serializing discarded values to binary formats (#5761)

2026-10-06 07:33:34 +02:00

type_error.md

📝 fix docs (#5217)

2026-06-29 22:15:18 +02:00

type_name.md

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type.md

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unflatten.md

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update.md

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2026-10-02 11:32:15 +02:00

value_t.md

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2026-10-02 11:32:15 +02:00

value.md

Fix key types convertible to std::string_view breaking lookups (#5689)

2026-10-04 11:46:32 +02:00

with_t.md

Add with_*_t alias templates to create basic_json types with changed template parameters (#5758)

2026-10-06 22:33:29 +02:00