Niels Lohmann
6a852ab96d
* Split the json_view feature page into sub-pages
The single features/json_view.md page grew to ~600 lines covering eight
topics. Split it into features/json_view/ with an overview page and
pages for ownership and lifetime, differences from basic_json, reading
values, generic code, editing, and images.
The new differences page collects what was spread over several sections
("What is the same", "What is different", "Duplicate keys", and notes in
the conversion and serialization sections) under one summary table, and
adds the parts of the basic_json interface a view does not have. The
other pages now link to it instead of restating the rules.
Internal links across the documentation point to the new pages.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
* Docs: fix stale comments and trim repeated text in json_view pages
- fig-jsonview.js/.css: point the header comments at the new pages
- reading.md: views' strings are valid as long as the document (and a
borrowed source text), as lifetime.md says
- reading.md, generic_code.md: link to differences.md instead of
restating the member-order and repeated-key rules
- differences.md: drop the third mention of ordering comparisons, name
rbegin()/rend() in the iterator row
- exceptions.md: link editable documents to editing.md
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
---------
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
1.3 KiB
1.3 KiB
nlohmann::basic_json_document::owns_source
bool owns_source() const noexcept;
Returns whether the document holds its own copy of the parsed text or is borrowing the caller's buffer.
Return value
#!cpp true if the document owns the text returned by source(), #!cpp false if it borrows it (or if
the document is discarded).
Exception safety
No-throw guarantee: this function never throws exceptions.
Complexity
Constant.
Notes
See the ownership table on parse for which inputs are borrowed and which are owned. A borrowed
document (#!cpp owns_source() == false) is only valid while the buffer it was parsed from is still alive.
Examples
??? example
```cpp
--8<-- "examples/basic_json_document__owns_source.cpp"
```
Output:
```json
--8<-- "examples/basic_json_document__owns_source.output"
```
See also
parse- deserialize from a compatible inputparse_copy- deserialize a copy of a compatible input, always ownedsource- the parsed text- Zero-copy JSON views - who owns the source text and for how long
Version history
- Added in version 3.13.0.