74 lines
2 KiB
Markdown
74 lines
2 KiB
Markdown
# basic_json::dump
|
|
|
|
```cpp
|
|
string_t dump(const int indent = -1,
|
|
const char indent_char = ' ',
|
|
const bool ensure_ascii = false,
|
|
const error_handler_t error_handler = error_handler_t::strict) const
|
|
```
|
|
|
|
Serialization function for JSON values. The function tries to mimic
|
|
Python's `json.dumps()` function, and currently supports its `indent`
|
|
and `ensure_ascii` parameters.
|
|
|
|
## Parameters
|
|
|
|
`indent` (in)
|
|
: If `indent` is nonnegative, then array elements and object
|
|
members will be pretty-printed with that indent level. An indent level of
|
|
`0` will only insert newlines. `-1` (the default) selects the most compact
|
|
representation.
|
|
|
|
`indent_char` (in)
|
|
: The character to use for indentation if `indent` is
|
|
greater than `0`. The default is ` ` (space).
|
|
|
|
`ensure_ascii` (in)
|
|
: If `ensure_ascii` is true, all non-ASCII characters
|
|
in the output are escaped with `\uXXXX` sequences, and the result consists
|
|
of ASCII characters only.
|
|
|
|
`error_handler` (in)
|
|
: how to react on decoding errors; there are three
|
|
possible values: `strict` (throws and exception in case a decoding error
|
|
occurs; default), `replace` (replace invalid UTF-8 sequences with U+FFFD),
|
|
and `ignore` (ignore invalid UTF-8 sequences during serialization; all
|
|
bytes are copied to the output unchanged).
|
|
|
|
## Return value
|
|
|
|
string containing the serialization of the JSON value
|
|
|
|
## Exception safety
|
|
|
|
Strong guarantee: if an exception is thrown, there are no
|
|
changes to any JSON value.
|
|
|
|
## Complexity
|
|
|
|
Linear.
|
|
|
|
## Notes
|
|
|
|
Binary values are serialized as object containing two keys:
|
|
|
|
- "bytes": an array of bytes as integers
|
|
- "subtype": the subtype as integer or `#!json null` if the binary has no subtype
|
|
|
|
## Example
|
|
|
|
??? example
|
|
|
|
The following example shows the effect of different `indent`,
|
|
`indent_char`, and `ensure_ascii` parameters to the result of the
|
|
serialization.
|
|
|
|
```cpp
|
|
--8<-- "examples/dump.cpp"
|
|
```
|
|
|
|
Output:
|
|
|
|
```json
|
|
--8<-- "examples/dump.output"
|
|
```
|