Niels Lohmann
6d3f0dae96
- Copying is disabled because of its cost, not because of two documents borrowing the same buffer; the unique_ptr follows from move-only. - Inputs: streams, FILE*, and wide characters (strings, arrays, pointers) are all supported and owned; point to parse_copy() for owned copies. - The error replay only runs for failing input, builds no values, and is skipped with allow_exceptions = false. - read() writes copied inputs into the previous owned copy. - Views can dangle like std::string_view, and why there is no shared/weak pointer design. - The 4 GiB limit (16-byte nodes, 16-byte scanner steps), streams being read to the end first, which macros apply, why materialize() has no source positions, and wording nits (accept() vs basic_json::accept(), is_binary, is_discarded, see-also lists, size table, "back into"). Signed-off-by: Niels Lohmann <mail@nlohmann.me>
1.1 KiB
1.1 KiB
nlohmann::basic_json_view::is_binary
bool is_binary() const noexcept;
This function always returns #!cpp false: a document is only ever parsed from JSON text, never from CBOR or the other
binary formats, and a JSON text has no binary values, so a view can never refer to one. The function exists for
interface parity with BasicJsonType::is_binary.
Return value
#!cpp false, always.
Exception safety
No-throw guarantee: this function never throws exceptions.
Complexity
Constant.
Examples
??? example
The example below classifies several parsed documents by the type of their root value, without materializing any
of them into a `BasicJsonType` value.
```cpp
--8<-- "examples/basic_json_view__type_predicates.cpp"
```
Output:
```json
--8<-- "examples/basic_json_view__type_predicates.output"
```
See also
- type - return the type of the value
BasicJsonType::is_binary- the corresponding function ofbasic_json
Version history
- Added in version 3.13.0.