Florian Albrechtskirchinger 078673fdd9 Rework basic_json element access to accept more key types

Rework basic_json element access member functions and operators to
accept any type that meets the requirements defined by type trait
detail::is_usable_as_key_type.

Member functions and operators:
* at()
* operator[]
* value()
* erase()
* find()
* count()
* contains()

Update documentation to reflect these changes.

Add unit tests to excercise the new functions using std::string_view.

Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com>

2022-04-27 12:09:03 +02:00

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nlohmann::basic_json::to_bson

// (1)
static std::vector<std::uint8_t> to_bson(const basic_json& j);

// (2)
static void to_bson(const basic_json& j, detail::output_adapter<std::uint8_t> o);
static void to_bson(const basic_json& j, detail::output_adapter<char> o);

BSON (Binary JSON) is a binary format in which zero or more ordered key/value pairs are stored as a single entity (a so-called document).

Returns a byte vector containing the BSON serialization.
Writes the BSON serialization to an output adapter.

The exact mapping and its limitations is described on a dedicated page.

Parameters

j (in): JSON value to serialize
o (in): output adapter to write serialization to

Return value

BSON serialization as byte vector
(none)

Exception safety

Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

Complexity

Linear in the size of the JSON value j.

Examples

??? example

The example shows the serialization of a JSON value to a byte vector in BSON format.
 
```cpp
--8<-- "examples/to_bson.cpp"
```

Output:

```json
--8<-- "examples/to_bson.output"
```

Version history

Added in version 3.4.0.

1.3 KiB Raw Blame History