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json_view: dump() without StringType::capacity() (#5999)

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* json_view: dump() without StringType::capacity() (#5994)

output_buffer::grow() compared the output size with m_out.capacity(),
which the StringType requirements do not include, so dump() did not
compile with the tests' alt_string. Keep what was last reserved in the
buffer itself and use it as a lower bound of the capacity instead.

Add json_view tests with alt_string (read-only and editable documents,
dump with several growth steps, save/load), and document reserve(n) and
resize(n) as the StringType requirements of basic_json_view::dump.

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

* Use a raw string literal in the alt-string json_view test

clang-tidy (modernize-raw-string-literal) rejects the escaped literal.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N5NasAgbDGG28MqXjQvLqp
Signed-off-by: Claude <noreply@anthropic.com>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Signed-off-by: Claude <noreply@anthropic.com>
Co-authored-by: Claude <noreply@anthropic.com>
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Niels LohmannandClaude Opus 5.5 authored and GitHub committed 2026-11-02 17:48:16 +01:00
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docs/mkdocs/docs/features/types/template_parameters.md
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@@ -406,6 +406,7 @@ using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;
| `#!cpp operator<<(std::ostream&, const json_pointer&)` | streamability to `#!cpp std::ostream` |
| [`to_string`](../../api/basic_json/to_string.md) | conversion of `StringType` to `#!cpp std::string` (the function returns a `#!cpp std::string`) |
| exception messages | `data()` and `size()`, or `begin()` and `end()` |
| [`basic_json_view::dump`](../../api/basic_json_view/dump.md) | `reserve(n)` and `resize(n)` (one argument); `capacity()` is **not** required |
### Compatible types