basic_json::from_msgpack

// (1)
template<typename InputType>
static basic_json from_msgpack(InputType&& i,
                               const bool strict = true,
                               const bool allow_exceptions = true);
// (2)
template<typename IteratorType>
static basic_json from_msgpack(IteratorType first, IteratorType last,
                               const bool strict = true,
                               const bool allow_exceptions = true);

Deserializes a given input to a JSON value using the MessagePack serialization format.

  1. Reads from a compatible input.
  2. Reads from an iterator range.

Template parameters

InputType : A compatible input, for instance:

- an `std::istream` object
- a `FILE` pointer
- a C-style array of characters
- a pointer to a null-terminated string of single byte characters
- an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

IteratorType : a compatible iterator type

Parameters

i (in) : an input in MessagePack format convertible to an input adapter

first (in) : iterator to start of the input

last (in) : iterator to end of the input

strict (in) : whether to expect the input to be consumed until EOF (#!cpp true by default)

allow_exceptions (in) : whether to throw exceptions in case of a parse error (optional, #!cpp true by default)

Return value

deserialized JSON value; in case of a parse error and allow_exceptions set to #!cpp false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

Exception safety

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

Complexity

Linear in the size of the input.

Example

??? example

The example shows the deserialization of a byte vector in MessagePack format to a JSON value.
 
```cpp
--8<-- "examples/from_msgpack.cpp"
```

Output:

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

Version history

  • Added in version 2.0.9.
  • Parameter start_index since version 2.1.1.
  • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
  • Added allow_exceptions parameter in version 3.2.0.