JSON for Modern C++ 3.9.1

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~basic_json
| ## ◆ from_bson() [3/4] template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer, class BinaryType = std::vector<std::uint8_t>> template<typename InputType >
static basic_json nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >::from_bson | ( | InputType && | i,
|  | const bool | strict = `true`,
|  | const bool | allow_exceptions = `true`
| ) |  |
| inline static
Deserializes a given input i to a JSON value using the BSON (Binary JSON) serialization format. The library maps BSON record types to JSON value types as follows:
BSON type | BSON marker byte | JSON value type
--- | --- | ---
double | 0x01 | number_float
string | 0x02 | string
document | 0x03 | object
array | 0x04 | array
binary | 0x05 | binary
undefined | 0x06 | still unsupported
ObjectId | 0x07 | still unsupported
boolean | 0x08 | boolean
UTC Date-Time | 0x09 | still unsupported
null | 0x0A | null
Regular Expr. | 0x0B | still unsupported
DB Pointer | 0x0C | still unsupported
JavaScript Code | 0x0D | still unsupported
Symbol | 0x0E | still unsupported
JavaScript Code | 0x0F | still unsupported
int32 | 0x10 | number_integer
Timestamp | 0x11 | still unsupported
128-bit decimal float | 0x13 | still unsupported
Max Key | 0x7F | still unsupported
Min Key | 0xFF | still unsupported
  Warning The mapping is incomplete. The unsupported mappings are indicated in the table above. Parameters
  [in] | i | an input in BSON format convertible to an input adapter
  [in] | strict | whether to expect the input to be consumed until EOF (true by default)
  [in] | allow_exceptions | whether to throw exceptions in case of a parse error (optional, true by default)
  Returns deserialized JSON value; in case of a parse error and allow_exceptions set to `false`, the return value will be value_t::discarded. Exceptions
  parse_error.114 | if an unsupported BSON record type is encountered
  Complexity Linear in the size of the input i. Example The example shows the deserialization of a byte vector in BSON format to a JSON value. 1 #include <iostream> 2 #include <iomanip> 3 #include <nlohmann/json.hpp> 4 5 using json = nlohmann::json; 6 7 int main() 8 { 9 // create byte vector 10 std::vector<uint8_t> v = {0x1b, 0x00, 0x00, 0x00, 0x08, 0x63, 0x6f, 0x6d, 11 0x70, 0x61, 0x63, 0x74, 0x00, 0x01, 0x10, 0x73, 12 0x63, 0x68, 0x65, 0x6d, 0x61, 0x00, 0x00, 0x00, 13 0x00, 0x00, 0x00 14 }; 15 16 // deserialize it with BSON 17 json j = json::from_bson(v); 18 19 // print the deserialized JSON value 20 std::cout << std::setw(2) << j << std::endl; 21 } Output (play with this example online):
      {
        "compact": true,
        "schema": 0
      }
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/from_bson.cpp -o from_bson
See also http://bsonspec.org/spec.html to_bson(const basic_json&) for the analogous serialization from_cbor(detail::input_adapter&&, const bool, const bool, const cbor_tag_handler_t) for the related CBOR format from_msgpack(detail::input_adapter&&, const bool, const bool) for the related MessagePack format from_ubjson(detail::input_adapter&&, const bool, const bool) for the related UBJSON format Definition at line 24365 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2940
nlohmann::basic_json::from_bson
static basic_json from_bson(InputType &&i, const bool strict=true, const bool allow_exceptions=true)
Create a JSON value from an input in BSON format.
Definition: json.hpp:24365