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Make view lookups last-wins and chained access safe

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* Lookups (operator[], at, find, contains, count, value, JSON pointers)
  return the last member of a duplicate key, as materialize() and
  parse() keep it.
* operator[] on a discarded view returns a discarded view instead of
  throwing, so v["a"]["b"] is safe for a missing "a".
* operator[] and at() take any integer type (not only int and size_t),
  fixing ambiguous calls with unsigned, long, std::int64_t, ...
* Fix the operator[] documentation, which claimed a discarded view for
  a type mismatch where type_error.305 is thrown.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-10-09 16:11:33 +02:00
parent 7852da2bc2
commit c7df23666f
16 changed files with 306 additions and 84 deletions
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6
docs/mkdocs/docs/api/basic_json_view/get.md
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@@ -87,9 +87,9 @@ exception thrown while converting through `materialize()` (the last bullet) is d
!!! info "Duplicate keys"
`#!cpp std::map`/`#!cpp std::unordered_map` conversions keep the *last* value of a repeated key, like
[`materialize()`](materialize.md) and [`BasicJsonType::parse()`](../basic_json/parse.md) do. This is the opposite
of [`operator[]`](operator[].md)/[`at`](at.md)/[`find`](find.md)/[`contains`](contains.md), which resolve to the
*first* occurrence (see the [Notes on duplicate keys](operator[].md#notes)).
[`materialize()`](materialize.md) and [`BasicJsonType::parse()`](../basic_json/parse.md) do. This is the member
[`operator[]`](operator[].md)/[`at`](at.md)/[`find`](find.md)/[`contains`](contains.md) resolve to, too (see the
[Notes on duplicate keys](operator[].md#notes)).
!!! info "No pointers, references, or implicit conversion"